运用Internet和Java开发技术，采用C/S模式，建立一个基于应用的即时通讯系统。本系统实现了用户注册，用户登陆，分组管理，好友管理，查询用户，用户即时通讯，查看聊天记录等功能。-The use of Internet and Java development technologies, using C/S mode, the establishment of a real-time communication system based on the application. The system implements the user registration, user login, group management, friends management, query users, instant messaging, view the chat log.