说明：  利用Java Socket编程实现在线聊天室, 实现在线用户的群聊，以及私聊。聊天室分为服务器端和客户端两部分，服务器端程序主要负责侦听客户端发来的消息,客户端需登录到服务器端才可以实现正常的聊天功能。设计的聊天室能显示登录用户列表，以及发送聊天信息和显示聊天信息的功能。运行程序，登录服务器后，可以从列表中选择单个或多个用户进行聊天，是图形界面，线程，流与文件系统等技术的综合应用。
(Using Java Socket programming to realize online chat room, group chat and private chat of online users. The chat room is divided into two parts: server and client. The server program is mainly responsible for listening for the messages sent by the client. The client needs to log in to the server to realize the normal chat function. The designed chat room can display the list of login users, as well as the function of sending chat information and displaying chat information. Running the program, after login to the server, you can choose one or more users from the list to chat, which is a comprehensive application of graphical interface, threads, streaming and file system technology.)