code: @Override
      public void onAfterSent(ChannelContext channelContext, Packet packet, boolean isSentSuccess) throws Exception {
          log.debug("消息包发送之后触发onAfterSent");
      }
docs: 消息包发送之后触发本方法
  @param channelContext
  @param packet
  @param isSentSuccess true:发送成功，false:发送失败
  
  @author tanyaowu