update

mec-im/src/main/java/com/ym/service/Impl/RoomServiceImpl.java

@@ -626,7 +626,7 @@ public class RoomServiceImpl implements RoomService {
             imHelper.publishMessage(userId, roomId, displayMessage);
             log.info("change display to screen: roomId={}, display={}", roomId, display);
         } else {
-            display += "?userId=" + "?uri=" + uri;
+            display += "?userId=" + userId + "?uri=" + uri;
 //            CheckUtils.checkArgument(uri != null, "uri must't be null");
 //            CheckUtils.checkArgument(whiteboardDao.findByRidAndWbid(roomId, uri).size() > 0, "whiteboard not exist");