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File-sharing is one of the main applications in P2P technology. JXTA is the most representative development platform for P2P. According to the research and analysis of the current P2P technologies and JXTA platform, we implemented a P2P file-sharing system based on JXTA. The system realized the basic functions of file-sharing and also improved its security. We propose three kinds of security strategy, which are the membership authentication, user reputation feedback and security model for trust spreading mechanism, and achieve a more safety P2P application model. The model has been applied to practical application and was shown that it has a good practical value.