聊天系统 1.用户与服务器发出去的消息完全可以由自已定制版面。2.可对sql进行检验的模块。3.不同人使用不同的命令的权限控制框架。4.使用新的Java非阻塞IO类来实现网络连接。,Chat system user and the server sent out the message entirely by their own custom layout. 2 of sql test module. 3 different people use different command authority control fr a mework. 4. Using the new Java non-blocking IO class to achieve network connectivity.