本系统是一个考试系统，实现服务器和客户端，他们是基于网络通信的实现客户端和服务器端通信，服务器给每一个客户端创建一个线程，为其提供服务-This is a examination system,which has a server and client,they are the realization of network-based communication client and server communications, server to each client to create a