判断wsurl 不为空

kernel-s-message/message-sdk-websocket/src/main/java/cn/stylefeng/roses/kernel/message/websocket/manager/WebSocketManager.java

@@ -76,10 +76,15 @@ public class WebSocketManager {
      * @date 2021/1/24 22:11
      */
     public static void sendMessage(Long userId, String message) {
-        for(Session userSession: getSessionByUserId(userId)){
+        List<Session> sessionList = getSessionByUserId(userId);
+        // 增加判断不为空
+        if (!CollectionUtils.isEmpty(sessionList)) {
+            for (Session userSession : sessionList) {
                 userSession.getAsyncRemote().sendText(message);
             }
         }
+    }
+
     /**
      * 发送消息
      *