解决大华API因鉴权失败导致的请求错误；

epmet-module/epmet-third/epmet-third-server/src/main/java/com/epmet/service/impl/VideoServiceImpl.java

@@ -39,10 +39,6 @@ public class VideoServiceImpl implements VideoService {
 
     private final ObjectMapper mapper = new ObjectMapper();
 
-    public VideoServiceImpl() throws ClientException {
-        iClient = new DefaultClient(host, username, password, clientId, clientSecret);
-    }
-
     /**
      * 获取设备通道列表
      *
@@ -78,6 +74,7 @@ public class VideoServiceImpl implements VideoService {
             log.error("设备通道列表为空");
             channelList = Collections.emptyList();
         }
+        iClient = null;
         return channelList;
     }
 
@@ -130,6 +127,9 @@ public class VideoServiceImpl implements VideoService {
         realtimeBody = String.format(realtimeBody, channelCode, streamType, type);
         log.info("请求参数：{}", realtimeBody);
         realtimeRequest.body(realtimeBody);
+        if (null == iClient) {
+            iClient = new DefaultClient(host, username, password, clientId, clientSecret);
+        }
         String realtimeResponse = iClient.doAction(realtimeRequest);
         String url = null;
         try {
@@ -143,6 +143,8 @@ public class VideoServiceImpl implements VideoService {
             throw new RuntimeException("response format error");
         } catch (IOException e) {
             e.printStackTrace();
+        } finally {
+            iClient = null;
         }
         return url;
     }