该程序是一个简单的聊天程序，主要功能是可以实现在两个不同电脑上进行聊天，不论是局域网还是互联网都可以。该程序是根据一个控制台程序修改而来，该控制台程序有两个类，服务器类和客户端类。通过修改我把这两个类里面的功能整合到了一块，服务器和客户端都在一个程序里面，使得使用更加简洁。不管是作为服务器还是客户端都使用这一程序即可。制作该程序是源于去年的一个Delphi程序，由于技术原因没有做完，它的功能是在局域网内建立聊天服务器，然后局域网内的所有用户通过搜索皆可以连接上聊天。所以通过JAVA程序的制作来完成以前未完成的任务。本程序只是一个简单的实现通信的程序，由于时间原因没有制作更多的功能，功能的扩展可以在以后的时间里进行升级添加。(The program is a simple chat program, the main function is to be able to chat on two different computers, either LAN or Internet. The program is modified by a console program that has two classes, server classes and client classes. By modifying the functions of these two classes into one, both the server and the client are in a program that makes the use more concise. Use this program either as a server or as a client. The program is originated from last year's Delphi program. Because of technical reasons, it didn't finish. Its function is to set up chat server in LAN, then all users in LAN can connect to chat through search. So through the production of JAVA program to complete the previous unfinished task. This program is just a simple program to realize communication. Because of time reason, no more functions are produced. The expansion of function can be upgraded and added in later time.)