feat:智能陪练一期

mec-websocket/src/main/java/com/ym/mec/web/controller/WebsocketController.java

@@ -31,7 +31,7 @@ public class WebsocketController extends BaseController {
     @ApiOperation(value = "获取在线人数")
     @GetMapping("getOnlineUserNum")
     public HttpResponseResult getOnlineUserNum(){
-        return succeed(WebSocketHandler.WS_CLIENTS);
+        return succeed(WebSocketHandler.WS_CLIENTS.keySet());
     }
 
     @RequestMapping("sendToUser")