比较简单的聊天程序，点对点聊天，分为服务端和客户端，需要先启动服务器后，客户端才能生效。这是最基本的聊天单元，只要理解了，你就可以在此基础上慢慢扩展，开发出功能更强的聊天软件。-Relatively simple chat program, peer-to-peer chat, and is divided into client and client services, need to restart the server after the client to enter into forc