AsyncTcp

代码说明：

  一般的聊天程序都是使用socket方式通讯的。对于一个聊天程序来说一般是一个服务器用来中转消息，然后是多个客户端通过连接服务器来消息交换。(General chat programs are using the socket mode of communication. For a chat program, it is generally a server used to relay the message, then multiple clients to connect to the server through the exchange of messages.)