P2P网络多媒体实时共享系统

提出一个基于三层模型的点对点(P2P)网络多媒体实时共享系统。P2P网络层基于JXTA协议实现对等点对资源的搜索和发布。服务层实现请求信息的解析并根据解析出的信息查找请求的媒体资源。媒体应用层基于JMF实现视频音频流的传输和播放，并创建副本资源向P2P网络发布资源通告。系统采用沿节点缓存，加快资源的搜索，同时提出对等点服务评估参数的概念，以此来动态的选择最优点作为服务提供者，避免P2P网络中热点的出现，平衡网络负载。

Multimedia Real-time Sharing System in P2P Network

This paper proposes a multimedia real-time sharing system in Peer-to-Peer(P2P) network based on a three-tier model. P2P network layer bases on JXTA protocol implements the resource search and issue. Service layer implements analysis of requesting information and searches media resource according to analytical result. Media application layer implements transmission and broadcast of audio and video streaming based on Java Media Framework(JMF), creates a copy of resource and publishes advertisement to the P2P network. This system uses catch along the matching points to speed up resource search. In order to avoid hot points, balance network load and select the optimum point dynamically, the paper proposes a concept of matching point service assessment parameter.