A java-rmi chat-room,instant messaging is one particular application in a broader class of applications known as presence-based applications. Presence-based applications are inherently distributed applications that build on the notion of a user’s

这是一个简单的聊天室程序。基于TCP/IP协议，使用多线程socket通信的编程。注册登陆界面。公聊界面。私聊界面。-This is a simple chat program. Based on TCP/IP protocol, using multi-threaded socket communication programming. Register login screen. Public chat interface. Private Chat interface.