使用Java实现点对点通信，数据库使用mysql.-Using Java to achieve the point to point communications functions with the MySQL as the database.

用java实现的类似qq的即时通讯程序，采用mysql数据库。-Instant messaging program with java achieve similar qq mysql database.

基于Java的局域网聊天程序（服务器端） 用户数据用MySQL数据库存储 实现单聊，群聊，文件传输等功能-Java-based LAN chat program (server-side) with a MySQL database to store user data to achieve a single chat, group chat, file transfer and other functions