用TCP协议实现了群聊功能，也可以端对端聊天，包括建立服务器端，建立客户端，对话框的设计，是学习网络不可多得的例子，特别是用多线程处理服务器端-TCP protocol used to achieve the group chat feature, you can chat with end-to-end, including the establishment of server-side, the establishment of