服务器主线程，负责为每个发出请求连接的客户端分配一个服务线程。-Server main thread is responsible for each client connection request is assigned a service thread.

局域网聊天系统，实现以IP连接完成文本聊天的功能-talk to each other

服务器程序，java编写程序，用Socket通信机制在服务器和客户端之间传输文件。 其中的服务器文件(Server program, Java programming, using Socket communication mechanism between the server and the client to transfer files. Server files)