这是一个CS模式的聊天室程序，共分为服务器端和客户端两部分，服务器端主要侦听客户端发来的消息，客户端需登陆服务器端才能实现聊天功能-This is a CS mode of chat room procedures, server-side is divided into two parts and the client, server-side client hair mainly listening to the message, the client need to login in or