Introducing new features.服务端下线逻辑优化

@@ -34,9 +34,11 @@ public class RouteHandler {
      * @throws IOException
      */
     public void userOffLine(CIMUserInfo userInfo, NioSocketChannel channel) throws IOException {
+        if (userInfo != null){
             LOGGER.info("用户[{}]下线", userInfo.getUserName());
-        SessionSocketHolder.remove(channel);
             SessionSocketHolder.removeSession(userInfo.getUserId());
+        }
+        SessionSocketHolder.remove(channel);
 
         //清除路由关系
         clearRouteInfo(userInfo);

@@ -39,7 +39,9 @@ public class ServerHeartBeatHandlerImpl implements HeartBeatHandler {
         long now = System.currentTimeMillis();
         if (lastReadTime != null && now - lastReadTime > heartBeatTime){
             CIMUserInfo userInfo = SessionSocketHolder.getUserId((NioSocketChannel) ctx.channel());
+            if (userInfo != null){
                 LOGGER.warn("客户端[{}]心跳超时[{}]ms，需要关闭连接!",userInfo.getUserName(),now - lastReadTime);
+            }
             routeHandler.userOffLine(userInfo, (NioSocketChannel) ctx.channel());
             ctx.channel().close();
         }