本程序是用TCP协议实现了一个聊天室的服务器端，它用TcpListener循环监听客户端发出的请求，并根据请求命令返回相应的聊天信息。-This procedure is used TCP protocol implements a chat room on the server side, it listens for requests with TcpListener circulation issued by the client, and at the request of the command returns the corresponding chat message.