修复代码审查反馈：完善SDK自动销毁逻辑和测试代码

Co-authored-by: binarywang <1343140+binarywang@users.noreply.github.com>

Author: Copilot

weixin-java-cp/src/main/java/me/chanjar/weixin/cp/config/WxCpConfigStorage.java

@@ -304,7 +304,7 @@ public interface WxCpConfigStorage {
 
   /**
    * 减少会话存档SDK的引用计数
-   * 当引用计数降为0时，自动销毁SDK
+   * 当引用计数降为0时，自动销毁SDK以释放资源
    *
    * @param sdk sdk id
    * @return 减少后的引用计数，如果返回0表示SDK已被销毁

weixin-java-cp/src/main/java/me/chanjar/weixin/cp/config/impl/WxCpDefaultConfigImpl.java

@@ -1,5 +1,6 @@
 package me.chanjar.weixin.cp.config.impl;
 
+import com.tencent.wework.Finance;
 import me.chanjar.weixin.common.bean.WxAccessToken;
 import me.chanjar.weixin.common.util.http.apache.ApacheHttpClientBuilder;
 import me.chanjar.weixin.cp.config.WxCpConfigStorage;
@@ -497,7 +498,14 @@ public synchronized int incrementMsgAuditSdkRefCount(long sdk) {
   @Override
   public synchronized int decrementMsgAuditSdkRefCount(long sdk) {
     if (this.msgAuditSdk == sdk && this.msgAuditSdkRefCount > 0) {
-      return --this.msgAuditSdkRefCount;
+      int newCount = --this.msgAuditSdkRefCount;
+      // 当引用计数降为0时，自动销毁SDK以释放资源
+      if (newCount == 0) {
+        Finance.DestroySdk(sdk);
+        this.msgAuditSdk = 0;
+        this.msgAuditSdkExpiresTime = 0;
+      }
+      return newCount;
     }
     return 0;
   }

weixin-java-cp/src/main/java/me/chanjar/weixin/cp/config/impl/WxCpRedisConfigImpl.java

@@ -1,5 +1,6 @@
 package me.chanjar.weixin.cp.config.impl;
 
+import com.tencent.wework.Finance;
 import me.chanjar.weixin.common.bean.WxAccessToken;
 import me.chanjar.weixin.common.util.http.apache.ApacheHttpClientBuilder;
 import me.chanjar.weixin.cp.config.WxCpConfigStorage;
@@ -515,7 +516,14 @@ public synchronized int incrementMsgAuditSdkRefCount(long sdk) {
   @Override
   public synchronized int decrementMsgAuditSdkRefCount(long sdk) {
     if (this.msgAuditSdk == sdk && this.msgAuditSdkRefCount > 0) {
-      return --this.msgAuditSdkRefCount;
+      int newCount = --this.msgAuditSdkRefCount;
+      // 当引用计数降为0时，自动销毁SDK以释放资源
+      if (newCount == 0) {
+        Finance.DestroySdk(sdk);
+        this.msgAuditSdk = 0;
+        this.msgAuditSdkExpiresTime = 0;
+      }
+      return newCount;
     }
     return 0;
   }

weixin-java-cp/src/test/java/me/chanjar/weixin/cp/api/WxCpMsgAuditTest.java

@@ -803,15 +803,23 @@ public void testNewSafeApi() throws Exception {
             suffix = "." + decryptData.getFile().getFileExt();
             sdkFileId = decryptData.getFile().getSdkFileId();
             break;
+          default:
+            // 未知消息类型，跳过处理
+            continue;
         }
 
         // 测试新的downloadMediaFile方法 - 不需要传入SDK
         String path = Thread.currentThread().getContextClassLoader().getResource("").getPath();
         String targetPath = path + "testfile-new/" + md5Sum + suffix;
         File file = new File(targetPath);
+        
+        // 确保父目录存在
         if (!file.getParentFile().exists()) {
           file.getParentFile().mkdirs();
-        } else {
+        }
+        
+        // 删除已存在的文件
+        if (file.exists()) {
           file.delete();
         }