基于JAVA语言，创建一个简单聊天室程序.主要板块有:进入系统界面,验证和保存上网者信息的程序,显示聊天信息,显示目前上网者的信息,离开聊天室注销等.-Based on the JAVA language, to create a simple chat room program. The main plates are: access to the system interface, authentication and preservation of Internet users of in