修复：根据代码审查反馈优化实现

Co-authored-by: binarywang <[email protected]>

Author: Copilot

spring-boot-starters/wx-java-pay-multi-spring-boot-starter/README.md

@@ -195,7 +195,7 @@ public class PayService {
     }
 
     // 查询订单
-    var result = wxPayService.queryOrderV3(null, outTradeNo);
+    WxPayOrderQueryV3Result result = wxPayService.queryOrderV3(null, outTradeNo);
     // 处理查询结果
     // ...
   }

spring-boot-starters/wx-java-pay-multi-spring-boot-starter/src/main/java/com/binarywang/spring/starter/wxjava/pay/service/WxPayMultiServicesImpl.java

@@ -32,22 +32,15 @@ public WxPayService getWxPayService(String configKey) {
       return null;
     }
 
-    WxPayService wxPayService = services.get(configKey);
-    if (wxPayService == null) {
-      synchronized (this) {
-        wxPayService = services.get(configKey);
-        if (wxPayService == null) {
-          WxPaySingleProperties properties = wxPayMultiProperties.getConfigs().get(configKey);
-          if (properties == null) {
-            log.warn("未找到配置标识为[{}]的微信支付配置", configKey);
-            return null;
-          }
-          wxPayService = this.buildWxPayService(properties);
-          services.put(configKey, wxPayService);
-        }
+    // 使用 computeIfAbsent 实现线程安全的懒加载，避免使用 synchronized(this) 带来的性能问题
+    return services.computeIfAbsent(configKey, key -> {
+      WxPaySingleProperties properties = wxPayMultiProperties.getConfigs().get(key);
+      if (properties == null) {
+        log.warn("未找到配置标识为[{}]的微信支付配置", key);
+        return null;
       }
-    }
-    return wxPayService;
+      return this.buildWxPayService(properties);
+    });
   }
 
   @Override

spring-boot-starters/wx-java-pay-multi-spring-boot-starter/src/test/java/com/binarywang/spring/starter/wxjava/pay/example/WxPayMultiExample.java

@@ -1,7 +1,10 @@
 package com.binarywang.spring.starter.wxjava.pay.example;
 
 import com.binarywang.spring.starter.wxjava.pay.service.WxPayMultiServices;
+import com.github.binarywang.wxpay.bean.request.WxPayRefundV3Request;
 import com.github.binarywang.wxpay.bean.request.WxPayUnifiedOrderV3Request;
+import com.github.binarywang.wxpay.bean.result.WxPayOrderQueryV3Result;
+import com.github.binarywang.wxpay.bean.result.WxPayRefundV3Result;
 import com.github.binarywang.wxpay.bean.result.WxPayUnifiedOrderV3Result;
 import com.github.binarywang.wxpay.bean.result.enums.TradeTypeEnum;
 import com.github.binarywang.wxpay.service.WxPayService;
@@ -137,7 +140,7 @@ public String queryOrderStatus(String appId, String outTradeNo) {
       }
 
       // 查询订单
-      var result = wxPayService.queryOrderV3(null, outTradeNo);
+      WxPayOrderQueryV3Result result = wxPayService.queryOrderV3(null, outTradeNo);
       String tradeState = result.getTradeState();
 
       log.info("查询订单状态成功，appId: {}, outTradeNo: {}, 状态: {}", appId, outTradeNo, tradeState);
@@ -188,7 +191,7 @@ public String refund(String appId, String outTradeNo, Integer refundFee,
       request.setAmount(amount);
 
       // 调用微信支付API申请退款
-      var result = wxPayService.refundV3(request);
+      WxPayRefundV3Result result = wxPayService.refundV3(request);
 
       log.info("申请退款成功，appId: {}, outTradeNo: {}, outRefundNo: {}",
         appId, outTradeNo, request.getOutRefundNo());