使用P2P技术设计的一个简易聊天程序。不使用专用的服务器，只要将好友添加到好友列表中，就能检测出好友是否在线，并相互发送聊天信息。-The use of P2P technology, designed for a simple chat program. Do not use a dedicated server, as long as the friend add to friends list, will be able to detect friends are online, and