Realize a simple public chat room feature, similar to Tencent QQ chat group, including client and server both applications, you can specify the server address and port number accordingly.

• 实现简单的公共聊天室功能，类似于腾讯QQ的群聊，包括客户端和服务器端两个应用程序，可以指定服务器地址和相应端口号。