Java实现QQ的基本聊天功能，可实现单聊、群聊、文件传输等功能，swing实现简单的界面显示，在局域网上基于本地服务器可做测试。-Java QQ realize the basic chat functions, can realize the single chat, group chat, file transfer and other functions, to realize a simple swing interface display, in the local area net