说明：  Java编写的网络聊天程序，代码与课程设计报告的结合。登陆，聊天，监听客户端，处理传来的信息，删除客户，退出等功能。
(Web chat program written in Java code and course design combined with the report. Login, chat, monitor client, processing the information coming from, delete clients, exit and other functions.)