Java聊天室程序源码，实现了以下功能：用户注册、资料保存、多用户登录、多用户同聊、私聊、保存用户记录、用户离开记录自动清除、在线人数监视-Java chat room program source code to achieve the following functions: user registration, data retention, multi-user login, multi-user with chat, private chat, save the user record