简易聊天程序（类似qq的群功能）。首先建立一个服务器端，然后通过不同客户端连接到该服务器，连接成功后，客户端之间可以进行聊天。-Simple chat program (similar to the group qq function). First, the establishment of a server-side, and then a different client to connect to the server, the connection is successful, the