Cooperative Work System And Security Problem Based On JXTA

With the popularization of P2P technique applications, paying more attention to this technique has been an urgent matter. This thesis based on JXTA, a P2P platform whose theories structure is fairly integrity, studies how to make P2P application, and discusses P2P security problems.In the first part, the thesis introduces the P2P technical development in present condition and the basis about JXTA. JXTA is expected to be the future P2P platform standard, but up to now include the core components and applications are still in experiment stage. In spite of such embarrassment, no matter JXTA can be extensively accepted or not, the new concepts, the design thought and the structure model of JXTA will produce enormous influence to the future P2P application by all means.P2PCW( P2P Cooperative Work system), is a set of cooperative work system which builds on the JXTA platform. That system uses P2P technique to help the departments under the business enterprise to work together more harmonious and more efficiency. In current edition, instant message, data share and work group management get more attentions, other ability will be added in future edition. P2PCW use pure P2P technique, which means no central server to participate in the system, such an construction has many differents to other familiar instant message system such as QQ, MSN etc, who must have a logging server. In the second part, the thesis tells how to construct such a system, include the design idea, system structure, structure and function of each module about this system. Also, this paper gives the key Java language code that some module functions realize yet.The security problem is one of the key problems in current P2P study. In tradition network system sacurity problem already contain many mature solution. But in P2P environment, especially pure P2P, because the central server no longer exsits, the traditional security solution can' t be transplanted completely. In the last part, the thesis according to the P2PCW system discusses how to resolve the security problem in JXTA pure P2P environment.