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atom.xml
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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>众里寻他千百度</title>
<link href="/atom.xml" rel="self"/>
<link href="http://pengdan.raven520.top/"/>
<updated>2019-10-01T09:02:18.646Z</updated>
<id>http://pengdan.raven520.top/</id>
<author>
<name>Raven</name>
</author>
<generator uri="http://hexo.io/">Hexo</generator>
<entry>
<title>想点法子用Nginx做"坏事"</title>
<link href="http://pengdan.raven520.top/2019/09/23/%E6%83%B3%E7%82%B9%E6%B3%95%E5%AD%90%E7%94%A8Nginx%E2%80%9C%E5%81%9A%E7%82%B9%E5%9D%8F%E4%BA%8B%E2%80%9D/"/>
<id>http://pengdan.raven520.top/2019/09/23/想点法子用Nginx“做点坏事”/</id>
<published>2019-09-23T06:47:00.423Z</published>
<updated>2019-10-01T09:02:18.646Z</updated>
<content type="html"><![CDATA[<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><ul><li><p>前言：</p><p> 之前一直有个想法，就是如何把我们学校的VPN服务映射出去。因为我们每次查成绩的时候，还需要登陆VPN，真的有点麻烦哦。然后我就想着，既然我本地连接了VPN，那么本地就可以请求到查询成绩的站点，那我如何通过 我的电脑把该站点映射出去呢？emm….</p><p> 思索了几天之后，我想了好几个思路，比如说自己写一个web应用请求 正方教务系统的数据，其他同学请求我的web服务器就好了。只需要在他本地的“host”文件替换下请求的主机即可。但是后来想了下，这样有点不切实际。实际操作起来还是有点复杂的。</p><p> 后来我突然想到了Nginx,对，以前也听过这个玩意。只知道他是做反响代理的服务器。这里很多同学们就有疑惑了。什么是正向代理呢？什么又是反向代理呢？那什么又是镜像网站呢？经常听说 镜像谷歌学术网站，镜像youtube…那这个原理又是什么呢？这个疑惑我稍后给大家讲解一下两者的区别。</p><ul><li>好了，接下来，进入正题吧。</li></ul></li></ul><h3 id="下载-Nginx"><a href="#下载-Nginx" class="headerlink" title="下载 Nginx."></a>下载 Nginx.</h3><ul><li><p>下载地址：[前去下载Nginx](<a href="http://nginx.org/en/download.html\" target="_blank" rel="noopener">http://nginx.org/en/download.html\</a>)</p><pre><code>这里要提醒一下，选择你自己操作系统对应的版本下载到本地即可。</code></pre></li><li><p>接着解压到桌面，你能找到的地方。</p><pre><code>eg: 我解压在E盘下</code></pre></li></ul><p><img src="//pengdan.raven520.top/2019/09/23/想点法子用Nginx“做点坏事”/1.png" alt></p><ul><li>接下来 ，进入 <code>/conf</code> ,找到 <code>nginx.conf</code> ,打开，编辑即可。</li><li>以下是我的配置文件。这里我提取了两个比较重要的配置部分出来。</li></ul><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br></pre></td><td class="code"><pre><span class="line">server {</span><br><span class="line"><span class="comment"><!-- 本地监听端口--></span></span><br><span class="line"> listen 808; </span><br><span class="line"> location / {</span><br><span class="line"> root html;</span><br><span class="line"> index index.html index.htm;</span><br><span class="line"> <span class="comment"><!-- 要代理的服务器地址--></span></span><br><span class="line"> proxy_pass http://219.231.36.51/;</span><br><span class="line"> proxy_set_header X-Real-IP $remote_addr;</span><br><span class="line"> proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;</span><br><span class="line"> proxy_set_header Host $http_host;</span><br><span class="line"> charset utf-8;</span><br><span class="line"> <span class="comment"><!-- 替换 文本内容--></span></span><br><span class="line"> sub_filter 'charset=gb2312' 'charset=utf-8';</span><br><span class="line"> sub_filter '<span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"login_left"</span>></span>' '<span class="tag"><<span class="name">script</span>></span><span class="undefined">console.log("hello world!")</span><span class="tag"></<span class="name">script</span>></span><span class="tag"><<span class="name">h1</span> <span class="attr">style</span>=<span class="string">"color:red;font-size:20px; "</span>></span>还在为登录不上VPN而被别人把好课都抢走而烦恼吗？<span class="tag"></<span class="name">h1</span>></span><span class="tag"><<span class="name">h1</span> <span class="attr">style</span>=<span class="string">"color:red;font-size:20px; "</span>></span>那你现在可以不用担心了，因为有我。<span class="tag"></<span class="name">h1</span>></span><span class="tag"><<span class="name">h1</span> <span class="attr">style</span>=<span class="string">"color:red;font-size:20px; "</span>></span>欢迎访问Raven为您提供的密道成绩系统，无需VPN,即可查成绩,选公选课。提供有体育在线测试考试一键满分（学期末考试周开放）。请收藏此站点！<span class="tag"></<span class="name">h1</span>></span><span class="tag"><<span class="name">h1</span> <span class="attr">style</span>=<span class="string">"color:red;font-size:20px; "</span>></span><span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"http://raven520.top"</span>></span>前去我的主页<span class="tag"></<span class="name">a</span>></span><span class="tag"></<span class="name">h1</span>></span><span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"login_left"</span>></span>'; </span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="comment"><!--缓存相关的配置--></span></span><br><span class="line"></span><br><span class="line"> location ~ .*\.(gif|jpg|png|css|js|default2.aspx)(.*) {</span><br><span class="line"> proxy_pass http://219.231.36.52/;</span><br><span class="line"> proxy_redirect off;</span><br><span class="line"> proxy_cache cache_one;</span><br><span class="line"> proxy_cache_valid 200 302 24h;</span><br><span class="line"> proxy_cache_valid 301 30d;</span><br><span class="line"> proxy_cache_valid any 5m;</span><br><span class="line"> expires 90d;</span><br><span class="line"> proxy_set_header X-Real-IP $remote_addr;</span><br><span class="line"> proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;</span><br><span class="line"> proxy_set_header Host $http_host;</span><br><span class="line"> charset utf-8;</span><br><span class="line"> # add_header wall "it is from cache!!!!!";</span><br><span class="line"> #sub_filter 'charset=gb2312' 'charset=utf-8';</span><br><span class="line"></span><br><span class="line"> sub_filter '<div class="login_left">' '<script>console.log("hello ~ world")</script><<h1 style="color:red;font-size:20px; ">还在为登录不上VPN而被别人把好课都抢走而烦恼吗？</h1><h1 style="color:red;font-size:20px; ">那你现在可以不用担心了，因为有我。</h1><h1 style="color:red;font-size:20px; ">欢迎访问Raven为您提供的密道成绩系统，无需VPN,即可查成绩,选公选课。提供有体育在线测试考试一键满分（学期末考试周开放）。请收藏此站点！</h1><h1 style="color:red;font-size:20px; "><a href="http://raven520.top">前去我的主页</a></h1><div class="login_left">'; </span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure><ul><li><p>配置完成了以后,启动Nginx, 可以进入nginx主目录,控制台 输入 start nginx。就可以启动nginx了。</p></li><li><p>接下来，启动一个 内网穿透，帮助我们把我们的 主机映射出去。这里 我推荐 使用花生壳，Natapp…当然你也可以自己利用frp 自己搭建穿透的服务器。这里我不再强调如何搭建 内网穿透的服务器，而是 怎么 镜像代理别人的网站做一个简单的总结 。</p></li><li><p>那么，接下来，我就用 花生壳，做一个简单的展示吧。</p></li></ul><p><img src="//pengdan.raven520.top/2019/09/23/想点法子用Nginx“做点坏事”/2.png" alt></p><ul><li><p>配置好主机地址以及 要映射的端口。这里 我们是需要把 Nginx 反向代理的 接口暴露出去，即就是Nginx监听的端口 808。配置好，点击保存，然后打开花生壳送给我们注册的域名，就可以看到我们映射出去的资源了。</p></li><li><p>如下图 。可以看到url是花生壳给我分配的二级域名（我们也可以绑定我们自己的域名，这里不做过多的说明）。而呈现的其中内容的一部分，也被我替换了。</p></li></ul><p><img src="//pengdan.raven520.top/2019/09/23/想点法子用Nginx“做点坏事”/3.png" alt></p><ul><li><p>可以看到原本网页根本没有这些内容：干干净净。</p><p><img src="//pengdan.raven520.top/2019/09/23/想点法子用Nginx“做点坏事”/4.png" alt></p><p>可是啊，同学，你以为这就结束了吗？我告诉你，并没有。因为，还有一个必杀技! 我们可以捕获到 通过我们 暴露连接 登录自己同学的 账号密码的信息（然并卵…，不过你可以登上他的教务系统看看他的照片啊哈哈哈。）。</p><p>日志文件配置如下：</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">http {</span><br><span class="line"> log_format post_log '$remote_addr - $remote_user [$time_local] -- $request_body';</span><br><span class="line"> access_log logs/access.log post_log;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure></li></ul><ul><li><p>假设有人登录,那么，这时候进入 /logs目录，查看access.log文件，往下翻日志，就会看到下图的信息。图中打码部分是我的账号密码…</p><p><img src="//pengdan.raven520.top/2019/09/23/想点法子用Nginx“做点坏事”/5.png" alt></p><p>这里要注意的是，因为post提交表单，正方教务系统没有对表达的数据密码进行加密！（安全???????额，好像前端加密也没意义,但总比没有好吧。），所以我们只需要对参数进行url解码即可得到该用户的密码。</p></li></ul><ul><li>最后要总结的是，如果修改了配置文件，如何要Nginx重新加载配置文件呢？</li></ul><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"># Nginx 重新加载配置文件</span><br><span class="line">nginx -s reload </span><br><span class="line"># 停止 Nginx 的工作。 </span><br><span class="line">nginx -s stop</span><br></pre></td></tr></table></figure><p> 所谓的镜像网站原理实现就是比如Nginx 这样的，别人为你提供了 反向代理的 服务。通过你请求他的服务器，然后他的服务器获取到你想要的信息，返回给你。这就是所谓的镜像技术。请求流量之间多了一层代理，而这个代理，用户自己根本看不到这个代理的过程，因为你不知道别人的服务器是向哪个地址发起数据请求的。故 这种代理模式就称之为 反向代理。</p><p> 而正向代理就很好理解了。就是这个过程是透明的，用户可以知道,如果用过 本地代理的都清楚，就是浏览器向 用户本地的某个 应用发起请求，这个 应用再向目标地址发起请求，这个过程就称之为正向代理，也就是说正向代理 是建立在 用户端上的，而反向代理是建立在服务端的。</p><!-- rebuild by neat -->]]></content>
<summary type="html">
<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><ul><li><p>前言：</p><p> 之前一直有个想法，就是如何把我们学校的VPN服务映射出去。因为我们每次查成绩的时候，还需要登陆VPN，真
</summary>
<category term="Nginx" scheme="http://pengdan.raven520.top/categories/Nginx/"/>
<category term="Nginx" scheme="http://pengdan.raven520.top/tags/Nginx/"/>
<category term="内网穿透" scheme="http://pengdan.raven520.top/tags/%E5%86%85%E7%BD%91%E7%A9%BF%E9%80%8F/"/>
</entry>
<entry>
<title>springboot整合websocket</title>
<link href="http://pengdan.raven520.top/2019/09/23/springboot%E6%95%B4%E5%90%88websocket%E7%9A%84%E6%80%BB%E7%BB%93/"/>
<id>http://pengdan.raven520.top/2019/09/23/springboot整合websocket的总结/</id>
<published>2019-09-23T05:17:02.139Z</published>
<updated>2019-03-21T14:31:04.763Z</updated>
<content type="html"><![CDATA[<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><h2 id="springboot整合websocket的总结"><a href="#springboot整合websocket的总结" class="headerlink" title="springboot整合websocket的总结"></a>springboot整合websocket的总结</h2><font face="微软雅黑" color="#0099ff">今天总结一下以往使用的websocket的两种方式</font><p>|第一种：</p><ul><li><p>导入依赖</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"><<span class="name">groupId</span>></span>org.springframework.boot<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"><span class="tag"><<span class="name">artifactId</span>></span>spring-boot-starter-web-services<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br></pre></td></tr></table></figure></li></ul><p> 值得一提的是，导入 spring-boot-starter-web-services 之后，spring-boot-starter-web 这个场景启动器就可以不用加了，我们可以点开 spring-boot-starter-web-services 可以看到，spring-boot-starter-web-services 里面就有依赖spring-boot-starter-web ，所以无需重复添加</p><p><img src="//pengdan.raven520.top/2019/09/23/springboot整合websocket的总结/Users\Raven\Desktop\Snipaste_2019-03-10_19-08-41.jpg" alt></p><ul><li><p>新建一个配置类</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Bean;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Configuration;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.socket.server.standard.ServerEndpointExporter;</span><br><span class="line"></span><br><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">WebSocketConfig</span> </span>{</span><br><span class="line"> <span class="meta">@Bean</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> ServerEndpointExporter <span class="title">serverEndpointExporter</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> ServerEndpointExporter();</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line">}</span><br></pre></td></tr></table></figure></li><li><p>新建一个配置websocket的类</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.websocket;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.CopyOnWriteArraySet;</span><br><span class="line"> </span><br><span class="line"><span class="keyword">import</span> javax.websocket.OnClose;</span><br><span class="line"><span class="keyword">import</span> javax.websocket.OnError;</span><br><span class="line"><span class="keyword">import</span> javax.websocket.OnMessage;</span><br><span class="line"><span class="keyword">import</span> javax.websocket.OnOpen;</span><br><span class="line"><span class="keyword">import</span> javax.websocket.Session;</span><br><span class="line"><span class="keyword">import</span> javax.websocket.server.ServerEndpoint;</span><br><span class="line"> </span><br><span class="line"><span class="keyword">import</span> lombok.extern.slf4j.Slf4j;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.slf4j.Logger;</span><br><span class="line"><span class="keyword">import</span> org.slf4j.LoggerFactory;</span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Component;</span><br><span class="line"><span class="meta">@Slf</span>4j</span><br><span class="line"><span class="meta">@ServerEndpoint</span>(value = <span class="string">"/websocket"</span>)</span><br><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">WebSocketServer</span> </span>{</span><br><span class="line"> <span class="comment">//静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">int</span> onlineCount = <span class="number">0</span>;</span><br><span class="line"> <span class="comment">//concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> CopyOnWriteArraySet<WebSocketServer> webSocketSet = <span class="keyword">new</span> CopyOnWriteArraySet<WebSocketServer>();</span><br><span class="line"> </span><br><span class="line"> <span class="comment">//与某个客户端的连接会话，需要通过它来给客户端发送数据</span></span><br><span class="line"> <span class="keyword">private</span> Session session;</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> <span class="keyword">static</span> Logger log = LoggerFactory.getLogger(WebSocketServer.class);</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 连接建立成功调用的方法*/</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">WebSocketServer</span><span class="params">()</span> </span>{</span><br><span class="line">System.out.println(<span class="string">"初始化！"</span>);</span><br><span class="line">}</span><br><span class="line"> <span class="meta">@OnOpen</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onOpen</span><span class="params">(Session session)</span> </span>{</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">this</span>.session = session;</span><br><span class="line"> webSocketSet.add(<span class="keyword">this</span>); <span class="comment">//加入set中</span></span><br><span class="line"> addOnlineCount(); <span class="comment">//在线数加1</span></span><br><span class="line"> log.info(<span class="string">"有新连接加入！当前在线人数为"</span> + getOnlineCount());</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> sendMessage(<span class="string">"连接成功"</span>);</span><br><span class="line"> } <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> log.error(<span class="string">"websocket IO异常"</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> </span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 连接关闭调用的方法</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="meta">@OnClose</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onClose</span><span class="params">()</span> </span>{</span><br><span class="line"> webSocketSet.remove(<span class="keyword">this</span>); <span class="comment">//从set中删除</span></span><br><span class="line"> subOnlineCount(); <span class="comment">//在线数减1</span></span><br><span class="line"> log.info(<span class="string">"有一连接关闭！当前在线人数为"</span> + getOnlineCount());</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 收到客户端消息后调用的方法</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> message 客户端发送过来的消息*/</span></span><br><span class="line"> <span class="meta">@OnMessage</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onMessage</span><span class="params">(String message, Session session)</span> </span>{</span><br><span class="line"> log.info(<span class="string">"来自客户端的消息:"</span> + message);</span><br><span class="line"> </span><br><span class="line"> <span class="comment">//群发消息</span></span><br><span class="line"> <span class="keyword">for</span> (WebSocketServer item : webSocketSet) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> item.sendMessage(message);</span><br><span class="line"> } <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * </span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> session</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> error</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="meta">@OnError</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onError</span><span class="params">(Session session, Throwable error)</span> </span>{</span><br><span class="line"> log.error(<span class="string">"发生错误"</span>);</span><br><span class="line"> error.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">sendMessage</span><span class="params">(String message)</span> <span class="keyword">throws</span> IOException </span>{</span><br><span class="line"> </span><br><span class="line"> session.getBasicRemote().sendText(message);</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 群发消息</span></span><br><span class="line"><span class="comment"> * */</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">sendInfo</span><span class="params">(String message)</span> <span class="keyword">throws</span> IOException </span>{</span><br><span class="line"> log.info(message);</span><br><span class="line"> <span class="keyword">for</span> (WebSocketServer item : webSocketSet) {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> item.sendMessage(message);</span><br><span class="line"> } <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> <span class="keyword">continue</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">synchronized</span> <span class="keyword">int</span> <span class="title">getOnlineCount</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">return</span> onlineCount;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">synchronized</span> <span class="keyword">void</span> <span class="title">addOnlineCount</span><span class="params">()</span> </span>{</span><br><span class="line"> WebSocketServer.onlineCount++;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">synchronized</span> <span class="keyword">void</span> <span class="title">subOnlineCount</span><span class="params">()</span> </span>{</span><br><span class="line"> WebSocketServer.onlineCount--;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></li><li><p>新建一个html文本</p><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">html</span> <span class="attr">xmlns</span>=<span class="string">"http://www.w3.org/1999/xhtml"</span>></span></span><br><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">"Content-Type"</span> <span class="attr">content</span>=<span class="string">"text/html; charset=utf-8"</span> /></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span>WebSocket Echo Demo<span class="tag"></<span class="name">title</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">name</span>=<span class="string">"viewport"</span> <span class="attr">content</span>=<span class="string">"width=device-width, initial-scale=1"</span>/></span></span><br><span class="line"> </span><br><span class="line"> <span class="tag"><<span class="name">script</span> <span class="attr">src</span>=<span class="string">"js/jquery-1.12.3.min.js"</span>></span><span class="undefined"></span><span class="tag"></<span class="name">script</span>></span></span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> <span class="tag"><<span class="name">script</span>></span><span class="undefined"></span></span><br><span class="line"><span class="undefined"> var ws = new WebSocket("ws://localhost:8080/websocket");</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"> ws.onopen = function (e) {</span></span><br><span class="line"><span class="undefined"> console.log('Connection to server opened');</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"> function sendMessage() {</span></span><br><span class="line"><span class="undefined"> ws.send($('#message').val());</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"> ws.onmessage = function (evt) { </span></span><br><span class="line"><span class="undefined"> var received_msg = evt.data;</span></span><br><span class="line"><span class="undefined"> alert(received_msg);</span></span><br><span class="line"><span class="undefined"> };</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"> ws.onclose = function(){ </span></span><br><span class="line"><span class="undefined"> // 关闭 websocket</span></span><br><span class="line"><span class="undefined"> alert("连接已关闭..."); </span></span><br><span class="line"><span class="undefined"> };</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">ws.onerror = function(err) { </span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">alert("Error: " + err); </span></span><br><span class="line"><span class="undefined">};</span></span><br><span class="line"><span class="undefined"> </span><span class="tag"></<span class="name">script</span>></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br><span class="line"> </span><br><span class="line"><span class="tag"><<span class="name">body</span> ></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"vertical-center"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"container"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span>></span> <span class="tag"></<span class="name">p</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">form</span> <span class="attr">role</span>=<span class="string">"form"</span> <span class="attr">id</span>=<span class="string">"chat_form"</span> <span class="attr">onsubmit</span>=<span class="string">"sendMessage(); return false;"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">class</span>=<span class="string">"form-group"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">input</span> <span class="attr">class</span>=<span class="string">"form-control"</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"message"</span> <span class="attr">id</span>=<span class="string">"message"</span></span></span><br><span class="line"><span class="tag"> <span class="attr">placeholder</span>=<span class="string">"Type text to echo in here"</span> <span class="attr">value</span>=<span class="string">""</span> /></span></span><br><span class="line"> <span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">button</span> <span class="attr">type</span>=<span class="string">"button"</span> <span class="attr">id</span>=<span class="string">"send"</span> <span class="attr">class</span>=<span class="string">"btn btn-primary"</span></span></span><br><span class="line"><span class="tag"> <span class="attr">onclick</span>=<span class="string">"sendMessage();"</span>></span></span><br><span class="line"> Send!</span><br><span class="line"> <span class="tag"></<span class="name">button</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">form</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">div</span>></span></span><br><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br><span class="line"><span class="tag"></<span class="name">html</span>></span></span><br></pre></td></tr></table></figure></li></ul><p>第二种：</p><p> 第二种相对来说麻烦一点，需要配置握手拦截器（HttpSessionHandshakeInterceptor） 以及实现一个WebSocketConfigurer。</p><ul><li><p>1.老规矩 引入websocket依赖(具体版本可以自己添加 不过springboot 默认会由一个版本)</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"><<span class="name">groupId</span>></span>org.springframework.boot<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"><span class="tag"><<span class="name">artifactId</span>></span>spring-boot-starter-web-services<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br></pre></td></tr></table></figure></li><li><p>2.配置一个Handle</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> springboot;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"><span class="keyword">import</span> java.util.ArrayList;</span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.List;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"><span class="keyword">import</span> java.util.Map.Entry;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.web.socket.CloseStatus; </span><br><span class="line"><span class="keyword">import</span> org.springframework.web.socket.TextMessage; </span><br><span class="line"><span class="keyword">import</span> org.springframework.web.socket.WebSocketHandler; </span><br><span class="line"><span class="keyword">import</span> org.springframework.web.socket.WebSocketMessage; </span><br><span class="line"><span class="keyword">import</span> org.springframework.web.socket.WebSocketSession; </span><br><span class="line"> </span><br><span class="line"><span class="comment">//extending either TextWebSocketHandler orBinaryWebSocketHandler </span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyHandler</span> <span class="keyword">implements</span> <span class="title">WebSocketHandler</span> </span>{ </span><br><span class="line"> </span><br><span class="line"> <span class="keyword">public</span> Map<WebSocketSession,String> map = <span class="keyword">new</span> HashMap<WebSocketSession,String >();</span><br><span class="line"><span class="comment">//连接关闭后</span></span><br><span class="line"> <span class="meta">@Override</span> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterConnectionClosed</span><span class="params">(WebSocketSession arg0, CloseStatus arg1)</span> <span class="keyword">throws</span> Exception </span>{ </span><br><span class="line"> <span class="comment">// TODO Auto-generated method stub </span></span><br><span class="line"> </span><br><span class="line"> System.out.println(<span class="string">"Connection closed..."</span>+arg0.getRemoteAddress().toString()); </span><br><span class="line"> map.remove(arg0);</span><br><span class="line"> } </span><br><span class="line"> <span class="comment">//连接建立后</span></span><br><span class="line"> <span class="meta">@Override</span> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterConnectionEstablished</span><span class="params">(WebSocketSession arg0)</span> <span class="keyword">throws</span> Exception </span>{ </span><br><span class="line"> <span class="comment">// TODO Auto-generated method stub </span></span><br><span class="line"> System.out.println(<span class="string">"Connection established..."</span>+arg0.getRemoteAddress().toString());</span><br><span class="line"> </span><br><span class="line"> } </span><br><span class="line"> <span class="comment">//收到消息后</span></span><br><span class="line"> <span class="meta">@Override</span> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">handleMessage</span><span class="params">(WebSocketSession arg0, WebSocketMessage<?> arg1)</span> <span class="keyword">throws</span> Exception </span>{ </span><br><span class="line"> <span class="comment">// TODO Auto-generated method stub </span></span><br><span class="line"> <span class="keyword">try</span> { </span><br><span class="line"> <span class="keyword">if</span>(map.containsKey(arg0)) {</span><br><span class="line"> System.out.println(<span class="string">"Req: "</span>+arg1.getPayload()); </span><br><span class="line"> TextMessage returnMessage = <span class="keyword">new</span> TextMessage(map.get(arg0)+<span class="string">":"</span>+arg1.getPayload().toString()); </span><br><span class="line"> <span class="comment">//arg0.sendMessage(returnMessage); </span></span><br><span class="line"> SendAllUser(returnMessage);</span><br><span class="line"> }<span class="keyword">else</span> {</span><br><span class="line"> </span><br><span class="line"> map.put(arg0,arg1.getPayload().toString());</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) { </span><br><span class="line"> e.printStackTrace(); </span><br><span class="line"> } </span><br><span class="line"> } </span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">SendAllUser</span><span class="params">(TextMessage returnMessage)</span> </span>{</span><br><span class="line"><span class="comment">// TODO Auto-generated method stub</span></span><br><span class="line"> <span class="keyword">if</span>(map.size()!=<span class="number">0</span>) {</span><br><span class="line"> <span class="keyword">for</span> (Entry<WebSocketSession, String> entry : map.entrySet()) { </span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line">entry.getKey().sendMessage(returnMessage);</span><br><span class="line">} <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"><span class="comment">// TODO Auto-generated catch block</span></span><br><span class="line">e.printStackTrace();</span><br><span class="line">}</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"><span class="comment">//错误后(客户端强制断开)</span></span><br><span class="line"> <span class="meta">@Override</span> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">handleTransportError</span><span class="params">(WebSocketSession arg0, Throwable arg1)</span> <span class="keyword">throws</span> Exception </span>{ </span><br><span class="line"> <span class="comment">// TODO Auto-generated method stub </span></span><br><span class="line"> <span class="keyword">if</span>(arg0.isOpen()){ </span><br><span class="line"> arg0.close(); </span><br><span class="line"> } </span><br><span class="line"> map.remove(arg0);</span><br><span class="line"> System.out.println(arg1.toString()); </span><br><span class="line"> System.out.println(<span class="string">"WS connection error,close..."</span>); </span><br><span class="line"> } </span><br><span class="line"> </span><br><span class="line"> <span class="meta">@Override</span> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">supportsPartialMessages</span><span class="params">()</span> </span>{ </span><br><span class="line"> <span class="comment">// TODO Auto-generated method stub </span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">false</span>; </span><br><span class="line"> } </span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">}</span><br></pre></td></tr></table></figure><ul><li><ol start="3"><li><p>配置一个握手拦截器(拦截请求)</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">package springboot;</span><br><span class="line"></span><br><span class="line">import java.util.Map; </span><br><span class="line"></span><br><span class="line">import org.springframework.http.server.ServerHttpRequest; </span><br><span class="line">import org.springframework.http.server.ServerHttpResponse; </span><br><span class="line">import org.springframework.web.socket.WebSocketHandler; </span><br><span class="line">import org.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor; </span><br><span class="line"> </span><br><span class="line">/** </span><br><span class="line"> * </span><br><span class="line"> * 类描述：握手拦截器 </span><br><span class="line"> * com.watcher.websocket.spring MyHandshakeInterceptor </span><br><span class="line"> * Created by 78098 on 2016年11月15日. </span><br><span class="line"> * version 1.0 </span><br><span class="line"> */ </span><br><span class="line">public class MyHandshakeInterceptor extends HttpSessionHandshakeInterceptor{ </span><br><span class="line"> </span><br><span class="line"> @Override </span><br><span class="line"> public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception ex) { </span><br><span class="line"></span><br><span class="line"> // TODO Auto-generated method stub </span><br><span class="line"> System.out.println("After handshake "+request.getRemoteAddress().toString()); </span><br><span class="line"> super.afterHandshake(request, response, wsHandler, ex); </span><br><span class="line"> } </span><br><span class="line"> </span><br><span class="line"> @Override </span><br><span class="line"> public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler handler, Map<String, Object> map) throws Exception { </span><br><span class="line"> // TODO Auto-generated method stub </span><br><span class="line"> System.out.println("Before handshake "+request.getRemoteAddress().toString()); </span><br><span class="line"> return super.beforeHandshake(request, response, handler, map); </span><br><span class="line"> } </span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">}</span><br></pre></td></tr></table></figure></li></ol></li></ul></li><li><p>4.实现配置类</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> springboot;</span><br><span class="line"></span><br><span class="line"> </span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Bean; </span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Configuration; </span><br><span class="line"><span class="keyword">import</span> org.springframework.web.socket.config.annotation.EnableWebSocket; </span><br><span class="line"><span class="keyword">import</span> org.springframework.web.socket.config.annotation.WebSocketConfigurer; </span><br><span class="line"><span class="keyword">import</span> org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry; </span><br><span class="line"> </span><br><span class="line"><span class="meta">@Configuration</span> <span class="comment">//配置类 </span></span><br><span class="line"><span class="meta">@EnableWebSocket</span> <span class="comment">//声明支持websocket </span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">WebSocketConfig</span> <span class="keyword">implements</span> <span class="title">WebSocketConfigurer</span></span>{ </span><br><span class="line"> </span><br><span class="line"> <span class="meta">@Override</span> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">registerWebSocketHandlers</span><span class="params">(WebSocketHandlerRegistry registry)</span> </span>{ </span><br><span class="line"> </span><br><span class="line"> <span class="comment">//注册websocket实现类，指定参数访问地址;allowed-origins="*" 允许跨域 </span></span><br><span class="line"> registry.addHandler(myHandler(), <span class="string">"/ws"</span>).addInterceptors(myHandshake()).setAllowedOrigins(<span class="string">"*"</span>); </span><br><span class="line"> <span class="comment">//允许客户端使用SockJS </span></span><br><span class="line"> registry.addHandler(myHandler(), <span class="string">"/sockjs/ws"</span>).addInterceptors(myHandshake()).withSockJS(); </span><br><span class="line"> </span><br><span class="line"> <span class="comment">/* registry.addHandler(myHandler(), "/webSocket");</span></span><br><span class="line"><span class="comment"> registry.addHandler(myHandler(), "/webSocket/socketJs").withSockJS();*/</span></span><br><span class="line"> } </span><br><span class="line"> </span><br><span class="line"> <span class="meta">@Bean</span> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> MyHandler <span class="title">myHandler</span><span class="params">()</span></span>{ </span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> MyHandler(); </span><br><span class="line"> } </span><br><span class="line"> </span><br><span class="line"> <span class="meta">@Bean</span> </span><br><span class="line"> <span class="function"><span class="keyword">public</span> MyHandshakeInterceptor <span class="title">myHandshake</span><span class="params">()</span></span>{ </span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> MyHandshakeInterceptor(); </span><br><span class="line"> } </span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">}</span><br></pre></td></tr></table></figure><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">以上就是springboot使用websocket的两种方法，用了websocket感觉真的挺简单的，原来，我们有了springboot,世界如此简单。还有一种node.js也可以搭建websocket后台服务器，那个就更简单了。。有兴趣的可以试试。</span><br></pre></td></tr></table></figure></li></ul><!-- rebuild by neat -->]]></content>
<summary type="html">
<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><h2 id="springboot整合websocket的总结"><a href="#springboot整合websocket的总结" class
</summary>
<category term="websocket" scheme="http://pengdan.raven520.top/categories/websocket/"/>
<category term="springboot" scheme="http://pengdan.raven520.top/categories/websocket/springboot/"/>
<category term="websocket" scheme="http://pengdan.raven520.top/tags/websocket/"/>
<category term="springboot" scheme="http://pengdan.raven520.top/tags/springboot/"/>
</entry>
<entry>
<title>mybatis的总结(1)</title>
<link href="http://pengdan.raven520.top/2019/09/23/mybatis%E6%80%BB%E7%BB%93/"/>
<id>http://pengdan.raven520.top/2019/09/23/mybatis总结/</id>
<published>2019-09-23T05:17:02.137Z</published>
<updated>2019-03-22T10:58:26.005Z</updated>
<content type="html"><![CDATA[<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><h3 id="mybatis-config-xml-标签属性"><a href="#mybatis-config-xml-标签属性" class="headerlink" title="mybatis-config.xml 标签属性"></a>mybatis-config.xml 标签属性</h3><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">typeAliases</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">typeAlias</span> <span class="attr">type</span>=<span class="string">"com.raven.pojo.hello"</span> <span class="attr">alias</span>=<span class="string">"he"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">package</span> <span class="attr">name</span>=<span class="string">"com.ranve.bean"</span>/></span></span><br><span class="line"><span class="tag"></<span class="name">typeAliases</span>></span></span><br></pre></td></tr></table></figure><p><typealias>标签：为这个类起别名 ，不添加==<em>alias</em>==属性默认为 ==类名首字母小写== ，该值可以在==mapper.xml==文件的==resultType==属性种引用</typealias></p><p><package>标签：为这个包的所有类起别名，类名首字母小写，为了防止 这个包下的实体类和子包的实体类名冲突，那么可以再类名上 用注解 ==@Alias(“value”)==起别名</package></p><p><strong>注意：别名用的时候不区分大小写</strong></p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">environments</span> <span class="attr">default</span>=<span class="string">"development"</span>></span></span><br><span class="line"><span class="tag"><<span class="name">environment</span> <span class="attr">id</span>=<span class="string">"development"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">transactionManager</span> <span class="attr">type</span>=<span class="string">"JDBC"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">"POOLED"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"driver"</span> <span class="attr">value</span>=<span class="string">"${jdbc.driver}"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"url"</span> <span class="attr">value</span>=<span class="string">"${jdbc.url}"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"username"</span> <span class="attr">value</span>=<span class="string">"${jdbc.username}"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"password"</span> <span class="attr">value</span>=<span class="string">"${jdbc.passwd}"</span>/></span></span><br><span class="line"> <span class="tag"></<span class="name">dataSource</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">environment</span>></span></span><br><span class="line"> </span><br><span class="line"> <span class="tag"><<span class="name">environment</span> <span class="attr">id</span>=<span class="string">"test"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">transactionManager</span> <span class="attr">type</span>=<span class="string">"JDBC"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">"POOLED"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"driver"</span> <span class="attr">value</span>=<span class="string">"${jdbc.driver}"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"url"</span> <span class="attr">value</span>=<span class="string">"${jdbc.url}"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"username"</span> <span class="attr">value</span>=<span class="string">"${jdbc.username}"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"password"</span> <span class="attr">value</span>=<span class="string">"${jdbc.passwd}"</span>/></span></span><br><span class="line"> <span class="tag"></<span class="name">dataSource</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">environment</span>></span></span><br><span class="line"><span class="tag"></<span class="name">environments</span>></span></span><br><span class="line"></span><br><span class="line"><span class="comment"><!--</span></span><br><span class="line"><span class="comment">databaseIdProvider </span></span><br><span class="line"><span class="comment">得到数据库厂商的表示，mybaits可以识别 </span></span><br><span class="line"><span class="comment">在mapper.xml的属性 databaseId 种填写value的值即可</span></span><br><span class="line"><span class="comment">--></span></span><br><span class="line"><span class="tag"><<span class="name">databaseIdProvider</span> <span class="attr">type</span>=<span class="string">"DB_VENDOR"</span>></span></span><br><span class="line"><span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"MySQL"</span> <span class="attr">value</span>=<span class="string">"mysql"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"Oracle"</span> <span class="attr">value</span>=<span class="string">"oracle"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"SQL Server"</span> <span class="attr">value</span>=<span class="string">"sqlserver"</span>/></span></span><br><span class="line"><span class="tag"></<span class="name">databaseIdProvider</span>></span></span><br></pre></td></tr></table></figure><ul><li>可以通过<environments>标签的==default==属性指定数据源</environments></li></ul><hr><h3 id="mapper标签详解："><a href="#mapper标签详解：" class="headerlink" title="mapper标签详解："></a>mapper标签详解：</h3><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?xml version="1.0" encoding="UTF-8"?></span></span><br><span class="line"><span class="meta"><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"></span></span><br><span class="line"><span class="tag"><<span class="name">mapper</span> <span class="attr">namespace</span>=<span class="string">"com.raven.dao.PayMapper"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">insert</span> <span class="attr">parameterType</span>=<span class="string">"com.raven.pay"</span> <span class="attr">id</span>=<span class="string">"insertPay"</span>></span></span><br><span class="line"> insert into t_pay(id,paytime,payname) values(0,#{paytime},#{payname})</span><br><span class="line"> <span class="tag"></<span class="name">insert</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">select</span> <span class="attr">resultType</span>=<span class="string">"com.raven.pay"</span> <span class="attr">id</span>=<span class="string">"selectPay"</span>></span></span><br><span class="line"> select id,paytime,paytime from t_pay where id=#{id}</span><br><span class="line"> <span class="tag"></<span class="name">select</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">update</span> <span class="attr">id</span>=<span class="string">"updatePay"</span>></span></span><br><span class="line"> updata t_pay set payname=#{payname},paytime=#{paytime}</span><br><span class="line"> <span class="tag"></<span class="name">update</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">delete</span> <span class="attr">id</span>=<span class="string">"deletePay"</span>></span></span><br><span class="line"> delete from t_pay whereid=#{id}</span><br><span class="line"> <span class="tag"></<span class="name">delete</span>></span></span><br><span class="line"><span class="tag"></<span class="name">mapper</span>></span></span><br></pre></td></tr></table></figure><ul><li>==parameterType==的意思是传来的参数类型，mybatis后面生成sql语句，会自动取出该对象的属性值到对应的#{}表达式中，==paramterType一般也可以省略不写==。</li><li>==resultType==的意思是返回的参数类型，就是查询出来mybatis会给你把查出来的参数封装成一个对象。</li><li>==id==属性又是什么意思呢？这个也是必须写的，你有没有想过一个问题，就是为什么我们只写一个接口mapper,再写一个mapper.xml文件，然后调用 sqlsession.getMapper(T class);就可以直接调用里面的方法呢？这个对象是谁实现的呢？mybatis为我们构造mapper代理对象的时候通过==namespace.id==实现了该接口的每个方法，它的原理就是这么来的。</li></ul><p>另外呢，对于<strong>mysql</strong>数据库而言，平时我们插入数据之后，有可能想获取自增后id的值，那么只需要再==insert==标签 使用如下两个属性即可</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">insert</span> <span class="attr">parameterType</span>=<span class="string">"com.raven.pay"</span> <span class="attr">id</span>=<span class="string">"insertPay"</span> <span class="attr">useGeneratedKeys</span>=<span class="string">"true"</span> <span class="attr">keyProperty</span>=<span class="string">"id"</span>></span></span><br><span class="line"> insert into t_pay(id,paytime,payname) values(0,#{paytime},#{payname})</span><br><span class="line"><span class="tag"></<span class="name">insert</span>></span></span><br></pre></td></tr></table></figure><ul><li>==useGeneratedKeys==表示自增主键获取主键值策略</li><li>==keyProperty==表示获取到主键值以后，将这个值封装给javaBean的那个属性值中。</li></ul><p>而对于 Oracle数据库而言就稍微麻烦一点了。如下：</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">insert</span> <span class="attr">parameterType</span>=<span class="string">"com.raven.pay"</span> <span class="attr">id</span>=<span class="string">"insertPay"</span> <span class="attr">databaseId</span>=<span class="string">"oracle"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">selectKey</span> <span class="attr">keyProperty</span>=<span class="string">"id"</span> <span class="attr">order</span>=<span class="string">"BEFORE"</span> <span class="attr">resultType</span>=<span class="string">"Integer"</span>></span></span><br><span class="line"> select PAY_SEQ.nextval from dual</span><br><span class="line"> <span class="tag"></<span class="name">selectKey</span>></span></span><br><span class="line"> insert into t_pay(id,paytime,payname) values(#{id},#{paytime},#{payname})</span><br><span class="line"><span class="tag"></<span class="name">insert</span>></span></span><br></pre></td></tr></table></figure><ul><li>运行过程：先运行selectKey查出id,然后再封装给javabean的属性。</li><li>==注意：这里使用了databaseId属性，也就是说你需要再 mybatis-config.xml中配置该数据库的厂商信息<databaseidprovider>==</databaseidprovider></li></ul><h2 id="mybatis多个参数查询-注意事项"><a href="#mybatis多个参数查询-注意事项" class="headerlink" title="mybatis多个参数查询 注意事项"></a>mybatis多个参数查询 注意事项</h2><ul><li><p>多参数 查询 方法参数需注解 ==@Param==，不加的话，那么会抛出异常，如若不想加@Param,还有一种解决方案就是把sql语句的id=#{id }改成 id=#{param1},#{payname}改成 #{param2},因为mybatis底层默认是把参数封装到map里，所以我们可以用 #{param1}…..#{paramn}取参数，也可以把param换成arg ,即用#{arg0}取值。==如果该方法参数是个list类型，那么可以通过 #{list[0]}…#{list[n]}取到值==</p><ul><li>mapper</li></ul><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">public Pay getPay(@Param("id")Stirng id,@Param("payname")String payname);</span><br></pre></td></tr></table></figure><ul><li><p>mapper.xml</p><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">select</span> <span class="attr">id</span>=<span class="string">"getPay"</span> <span class="attr">resultType</span>=<span class="string">"com.raven.pojo.Pay"</span>></span></span><br><span class="line">select * from t_pay where id=#{id} and payname=#{payname}</span><br><span class="line"><span class="tag"></<span class="name">select</span>></span></span><br></pre></td></tr></table></figure><p>推荐做法1：直接传入==业务逻辑数据模型==，如下：（这样也可以直接取）</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> Pay <span class="title">getPay</span><span class="params">(Pay pay)</span></span>;</span><br></pre></td></tr></table></figure><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">select</span> <span class="attr">id</span>=<span class="string">"getPay"</span> <span class="attr">resultType</span>=<span class="string">"com.raven.pojo.Pay"</span>></span></span><br><span class="line">select * from t_pay where id=#{id} and payname=#{payname}</span><br><span class="line"><span class="tag"></<span class="name">select</span>></span></span><br></pre></td></tr></table></figure><p>推荐做法2：如果没有对应的==pojo==，那么可以定义并给方法传入一个 Map类型的对象，把要传递的参数值都put进map对象，之后把也可以向推荐做法1那样直接取值。</p></li></ul></li></ul><h2 id="mybatis中-和-的区别？"><a href="#mybatis中-和-的区别？" class="headerlink" title="mybatis中 #{} 和${}的区别？"></a>mybatis中 #{} 和${}的区别？</h2><ul><li>#{} 是已预编译的形式，将参数设置到sql语句，PreparedStatement也可以防止sql注入。（安全 ）</li><li>${} 是 把 参数的值 直接拼装到sql语句中，会有安全问题。</li></ul><h2 id="mybatis-如何返回-map类型，并且-指定-key-是自定义参数？"><a href="#mybatis-如何返回-map类型，并且-指定-key-是自定义参数？" class="headerlink" title="mybatis 如何返回 map类型，并且 指定 key 是自定义参数？"></a>mybatis 如何返回 map类型，并且 指定 key 是自定义参数？</h2><p> 使用@MapKey标注在方法上即可，value的值为 map 封装 key 的字段属性</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@MapKey</span>(<span class="string">"name"</span>)</span><br><span class="line"><span class="function"><span class="keyword">public</span> Map<String,Pay> <span class="title">getPayNameLike</span><span class="params">(String name)</span></span>;</span><br></pre></td></tr></table></figure><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><select id="getPay" resultType="map"></span><br><span class="line">select * from t_pay where name like #{name}</span><br><span class="line"></select></span><br></pre></td></tr></table></figure><h2 id="resultMap-标签详解"><a href="#resultMap-标签详解" class="headerlink" title="resultMap 标签详解"></a>resultMap 标签详解</h2><p>如下图示例：</p><p><img src="/1.jpg" alt></p><ul><li><p>我们使用了select标签的时候，查询某个pojo对象，这个对象的某个属性不是java的基本类型，而是一个对象，那么这个时候我们就可以使用到了 这个resutMap 属性，<code>注意:在<select>标签里，要么使用resultMap要么使用resultType，只能使用一个</code>，这个时候，我们就可以配置映射集了，即resultMap就是会我们封装对象的。看上图的<code><association></code>标签，</p><ul><li><p>其中的<code>property</code>属性代表了 当前==pojo对象的某个是对象的属性==，如我的值 是xsdcode,那么就是我这个实体类的xsdcode这个对象的这个属性是个对象。</p></li><li><p><code>column</code> 属性代表 这个属性对应的数据表字段。</p></li><li><p><code>select</code>属性代表 查询这个 属性对象的对应查询语句。即就是指向了它自己mapper文件的对应查询语句。</p><p> <img src="//pengdan.raven520.top/2019/09/23/mybatis总结/2.jpg" alt></p></li></ul></li></ul><!-- rebuild by neat -->]]></content>
<summary type="html">
<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><h3 id="mybatis-config-xml-标签属性"><a href="#mybatis-config-xml-标签属性" class="
</summary>
<category term="mybatis" scheme="http://pengdan.raven520.top/categories/mybatis/"/>
<category term="mybatis" scheme="http://pengdan.raven520.top/tags/mybatis/"/>
</entry>
<entry>
<title>Hello World</title>
<link href="http://pengdan.raven520.top/2019/09/23/hello-world/"/>
<id>http://pengdan.raven520.top/2019/09/23/hello-world/</id>
<published>2019-09-23T05:17:02.135Z</published>
<updated>2019-03-15T12:19:57.599Z</updated>
<content type="html"><![CDATA[<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p><h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure><p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="noopener">Writing</a></p><h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure><p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">Server</a></p><h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure><p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">Generating</a></p><h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure><p>More info: <a href="https://hexo.io/docs/deployment.html" target="_blank" rel="noopener">Deployment</a></p><!-- rebuild by neat -->]]></content>
<summary type="html">
<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hex
</summary>
</entry>
<entry>
<title>docker的初体验</title>
<link href="http://pengdan.raven520.top/2019/09/23/docker%E7%9A%84%E5%88%9D%E4%BD%93%E9%AA%8C/"/>
<id>http://pengdan.raven520.top/2019/09/23/docker的初体验/</id>
<published>2019-09-23T05:17:02.133Z</published>
<updated>2019-09-23T05:23:11.301Z</updated>
<content type="html"><![CDATA[<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><h2 id="docker的初体验"><a href="#docker的初体验" class="headerlink" title="docker的初体验"></a>docker的初体验</h2><p>早都听说过docker,但是一直却不知道它是什么?今天有时间就研究了一下怎么安装并使用<br>docker,特此记录一下。</p><ul><li>首先呢，我们需要安装自己的一款虚拟机，具体教程可以百度。</li><li>第二步，就是下载一款linux系统，这里我推荐使用centos。<a href="https://www.centos.org/download/" target="_blank" rel="noopener">下载链接</a></li><li>第三步，就是安装centos了，这些都不是最重要的，而且整个过程也很简单，就不一一记录了。</li><li><p>1.安装好了centos之后，使用命令先安装 vim编译器：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">yum -y install vim*</span><br></pre></td></tr></table></figure><p>2.因为<strong>docker</strong> 要求 CentOS 系统的内核版本高于 3.10,所以先通过</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">uname -r</span><br></pre></td></tr></table></figure><p>查看内核版本是否满足，如果小于3.10，那么使用以下命令更新内核。</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sudo yum update</span><br></pre></td></tr></table></figure><ol start="3"><li><p>运行以下命令</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">#安装一些必要的系统工具：</span><br><span class="line">sudo yum install -y yum-utils device-mapper-persistent-data lvm2</span><br><span class="line"></span><br><span class="line">添加软件源信息：</span><br><span class="line">sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo</span><br><span class="line"></span><br><span class="line">更新 yum 缓存：</span><br><span class="line">sudo yum makecache fast</span><br><span class="line"></span><br><span class="line">安装 Docker-ce：</span><br><span class="line">sudo yum -y install docker-ce</span><br><span class="line"></span><br><span class="line">运行docker</span><br><span class="line">sudo systemctl start docker</span><br></pre></td></tr></table></figure><p>想运行一个docker 的helloworld容器，但是却找不到。</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sudo docker run hello-world</span><br></pre></td></tr></table></figure><p>这时候 进入 /etc/docker 目录，新建一个daemon.json文件（如果该文件存在，那么在后面追加内容即可）</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"># 新建文件</span><br><span class="line">touch daemon.json</span><br><span class="line"># 编辑文件</span><br><span class="line">vim /etc/docker</span><br><span class="line"></span><br><span class="line">#增加以下内容：</span><br><span class="line"> { "storage-driver": "devicemapper"}</span><br></pre></td></tr></table></figure></li></ol></li></ul><pre><code>保存退出vim编辑器，然后就可以运行 helloworld 啦~ </code></pre><ul><li><p>最后想给docker容器安装一下 mysql，却发现查找不到。。<br>解决方案：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"># 安装dig命令</span><br><span class="line">yum install bind-utils</span><br><span class="line"></span><br><span class="line">dig @114.114.114.114 registry-1.docker.io</span><br></pre></td></tr></table></figure><p>运行完可见下图：<img src="https://img-blog.csdnimg.cn/20190315185817551.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h1aWppYWFhMQ==,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"><br>再上面随便选择一个ip,最后呢，再修改hosts文件，</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">cd /etc </span><br><span class="line">vim hosts</span><br></pre></td></tr></table></figure><p>添加以下dns映射即可，之后退出vim。<img src="https://img-blog.csdnimg.cn/20190315190318947.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h1aWppYWFhMQ==,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">#重启 docker容器。</span><br><span class="line">sudo service docker restart</span><br><span class="line"></span><br><span class="line">#查找musql</span><br><span class="line">docker search mysql</span><br><span class="line"></span><br><span class="line">#安装msql</span><br><span class="line">docker pull mysql</span><br><span class="line"></span><br><span class="line">#进入容器</span><br><span class="line">docker exec -it mysql bash</span><br><span class="line">#登录mysql</span><br><span class="line">mysql -u root -p</span><br><span class="line">ALTER USER 'root'@'localhost' IDENTIFIED BY '你要设置的密码';</span><br><span class="line">#添加远程登录用户</span><br><span class="line">CREATE USER '你的昵称'@'%' IDENTIFIED WITH mysql_native_password BY '你的密码';</span><br><span class="line">GRANT ALL PRIVILEGES ON *.* TO '你的昵称'@'%';</span><br></pre></td></tr></table></figure><p>接着我们root用户使用Navicat连接容器的mysql,却报错<strong>Client does not support authentication protocol requested by server; consider upgrading MySQL</strong>，<br>于是：</p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '你的密码';</span><br><span class="line">ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '你的密码';</span><br><span class="line">SELECT plugin FROM mysql.user WHERE User = 'root';</span><br></pre></td></tr></table></figure><p>即可连接成功，最后想退出docker容器，注意不是关闭docker服务 ，<br>因为我们刚才进入mysql容器，所以不用的时候可以退出docker命令。<br>使用命令 exit 即可</p></li></ul><!-- rebuild by neat -->]]></content>
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<!-- build time:Thu Dec 19 2019 11:44:03 GMT+0800 (GMT+08:00) --><h2 id="docker的初体验"><a href="#docker的初体验" class="headerlink" title="docker的
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