We discuss three classic P2P resource locating methods, centralized directory model, flooded requests model and document routing model, with the help of three application systems, Napster, Gnutella and Freenet.

• 本文结合具体的实例系统Napster、Gnutella和Freenet对centralized directory model、flooded requests model、document routing model这三种经典的P2P资源定位模型进行了研究,分析了这三种模型的工作机制,总结了它们的得失。