fix(electric):修复充电响应数据解析逻辑

- 移除无用的 JsonElement 和 NoSuchAlgorithmException 导入
- 增加对第三方接口响应数据为空的判断和日志记录- 修改签名验证逻辑，将 ret、msg 和 data 拼接后进行校验- 优化代码结构，提高可读性和健壮性

src/main/java/com/zsElectric/boot/common/util/electric/ChargingUtil.java

@@ -2,7 +2,6 @@ package com.zsElectric.boot.common.util.electric;
 
 import cn.hutool.core.bean.BeanUtil;
 import com.google.gson.Gson;
-import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.zsElectric.boot.common.constant.ConnectivityConstants;
 import com.zsElectric.boot.common.util.AESCryptoUtil;
@@ -13,7 +12,6 @@ import jakarta.annotation.Resource;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Component;
 
-import java.security.NoSuchAlgorithmException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
@@ -70,14 +68,18 @@ public class ChargingUtil {
     public JsonObject responseDecode(JsonObject response){
 
         try {
+            if (Objects.isNull(response)) {
+                log.error("第三方接口响应数据为空");
+                return null;
+             }
             Gson gson = new Gson();
             ResponseParmsEntity responseParms = gson.fromJson(response, ResponseParmsEntity.class);
-            boolean verify = HmacMD5Util.verify(responseParms.getData(), ConnectivityConstants.PLATFORM_DATA_SECRET, responseParms.getSig());
+            String data = responseParms.getRet() + responseParms.getMsg() + responseParms.getData();
+            boolean verify = HmacMD5Util.verify(data, ConnectivityConstants.PLATFORM_DATA_SECRET, responseParms.getSig());
             if (!verify) {
                 log.error("第三方接口响应数据签名验证失败");
                 return null;
             }
-
             if (responseParms.getRet() != 0){
                 switch (responseParms.getRet()) {
                     case -1:
@@ -100,7 +102,6 @@ public class ChargingUtil {
                         break;
                 }
             }
-
             String decodeData = AESCryptoUtil.decrypt(responseParms.getData(), ConnectivityConstants.PLATFORM_DATA_SECRET,
                     ConnectivityConstants.PLATFORM_DATA_SECRET_IV);
             return gson.fromJson(decodeData, JsonObject.class);