TCP通信，服务器端、客户端集成在一个程序中，服务器必须先登陆然后让客户端登陆，之后二者可以随意收发文字内容。如果服务器端的IP改变则需要在客户端源码处更改服务器IP-TCP communications, server-side, client integrated in one program, the server must first landing and then let the client landing, followed by the two can send and rec