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<p>本笔记的主要内容是关于学习中可能用到的数学知识。之所以叫《数海钩沉》是为了致敬研一上过的一门关于逻辑学的课程的老师，在课上老师提起了一段关于数海钩沉的往事。数海钩沉，从词义上看便能看出写此笔记的本意，数学是现代科学的基础，为了做研究我们时时在这之间沉浮。在沉浮之间，愿各位都能在各自的领域中有所成就。</p>
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<p>Tips:本笔记主要信息来自于传智播客2015年胡斌SpringMVC备课笔记。笔记内容为：学习资料 + 个人补充；如有内容或排版方面的错误，欢迎纠正~</p>
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<h1 id="SpringMVC介绍"><a href="#SpringMVC介绍" class="headerlink" title="SpringMVC介绍"></a>SpringMVC介绍</h1><h2 id="为什么使用SpringMVC？"><a href="#为什么使用SpringMVC？" class="headerlink" title="为什么使用SpringMVC？"></a>为什么使用SpringMVC？</h2><p>&emsp;&emsp;很多应用程序的问题在于处理业务数据和显示业务数据的视图的对象之间存在紧密耦合。通常，更新业务对象的命令都是从视图本身发起的，使视图对任何业务对象更改都有高度敏感性。而且，当多个视图依赖于同一个业务对象时是没有灵活性的。<br>&emsp;&emsp;Spring Web MVC是一种基于Java的实现了Web MVC设计模式的请求驱动类型的轻量级Web框架，即使用了MVC架构模式的思想，将web层进行职责解耦，基于请求驱动指的就是使用请求-响应模型，框架的目的就是帮助我们简化开发，Spring Web MVC也是要简化我们日常Web开发的。</p>
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<p>Tips:本笔记主要信息来源为传智播客的《<a href="https://www.bilibili.com/video/av14839030/">60集精通java教程Spring框架开发</a>》,笔记内容为：学习资料 + 个人补充；如有内容或排版方面的错误，欢迎纠正~</p>
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<p>** 内容分布**</p>
<ol>
<li>spring概念和ioc入门（ioc操作xml配置文件）</li>
<li>spring的ioc操作（注解）和aop概念</li>
<li>jdbcTemplate和spring管理事务</li>
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        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>


  &#123;% if theme.leancloud_visitors.enable %&#125;

  <script src="//code.bdstatic.com/npm/leancloud-storage@4.12.0/dist/av-min.js"></script>
  <script>AV.init({
    appId: "s6muKVxXUCdtQQP2ceW51sAG-gzGzoHsz",
    appKey: "Qi3dUay0mF0hE6WkmVNtAjKL",
    serverURL: ""
  });
  </script>
  <script>
    function showTime(Counter) {
      var query = new AV.Query(Counter);
      var entries = [];
      var $visitors = $(".leancloud_visitors");

      $visitors.each(function () {
        entries.push( $(this).attr("id").trim() );
      });

      query.containedIn('url', entries);
      query.find().then(function (results) {
          var COUNT_CONTAINER_REF = '.leancloud-visitors-count';

          if (results.length === 0) {
            $visitors.find(COUNT_CONTAINER_REF).text(0);
            return;
          }

          for (var i = 0; i < results.length; i++) {
            var item = results[i];
            var url = item.get('url');
            var time = item.get('time');
            var element = document.getElementById(url);

            $(element).find(COUNT_CONTAINER_REF).text(time);
          }
          for(var i = 0; i < entries.length; i++) {
            var url = entries[i];
            var element = document.getElementById(url);
            var countSpan = $(element).find(COUNT_CONTAINER_REF);
            if( countSpan.text() == '') {
              countSpan.text(0);
            }
          }
        })
        .catch(function (object, error) {
          console.log("Error: " + error, object);
        });
    }

    function addCount(Counter) {
      var $visitors = $(".leancloud_visitors");
      var url = $visitors.attr('id').trim();
      var title = $visitors.attr('data-flag-title').trim();
      var query = new AV.Query(Counter);

      query.equalTo("url", url);
      query.find().then(function(results) {
        console.log(results);
        if (results.length > 0) {
            var counter = results[0];
            counter.fetchWhenSave(true);
            counter.increment("time");
            counter.save().then(function(counter) {
                var $element = $(document.getElementById(url));
                $element.find('.leancloud-visitors-count').text(counter.get('time'));
            })
            .catch(function(counter, error) {
              console.log('Failed to save Visitor num, with error message: ' + error.message);
            })
          } else {
            var newcounter = new Counter();
            /* Set ACL */
            var acl = new AV.ACL();
            acl.setPublicReadAccess(true);
            acl.setPublicWriteAccess(true);
            newcounter.setACL(acl);
            /* End Set ACL */
            newcounter.set("title", title);
            newcounter.set("url", url);
            newcounter.set("time", 1);
            newcounter.save().then(function(newcounter) {
                var $element = $(document.getElementById(url));
                $element.find('.leancloud-visitors-count').text(newcounter.get('time'));
              }).catch(function(newcounter, error) {
                console.log('Failed to create');
              })
          }
        })
      .catch(function(error) {
          console.log('Error:' + error);
      })
    }

    $(function() {
      var Counter = AV.Object.extend("Counter");
      if ($('.leancloud_visitors').length == 1) {
        addCount(Counter);
      } else if ($('.post-title-link').length > 1) {
        showTime(Counter);
      }
    });
  </script>

&#123;% endif %&#125;
  

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          inlineMath: [ ['$','$'], ["\\(","\\)"]  ],
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    <script type="text/javascript" src="//cdn.bootcss.com/mathjax/2.7.1/latest.js?config=TeX-AMS-MML_HTMLorMML"></script>
  

</body>
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