计算机网络课程设计的作业，实现一个服务器和一个客户端，客户端可以登录发送消息聊天，也可下载服务器上传的资源（音频、视频）-A design work of the lesson COMPUTER NET,including a server and a client.

A network is a set of interconnected electronic devices (computers, printers, scanners, modems, routers, switches, etc.) capable of communicating (sending and receiving messages) via a communication medium . Lesson Plan Principles of architecture