文件共享作为人们工作学习中最有效的方式之一，但是在网络状况不好甚至是没有网络的时候用户想要共享文件是不能实现的，针对此问题，提出了一个在移动终端上实现的文件共享系统。在本系统中，用户可以自行组织成网络进行文件共享，不必考虑外部的网络环境，通过底层使用Ad Hoc网络，在网络内部使用UDP广播，可实现各节点快速的文件共享。通过无线局域网内部的文件共享实验，证实了该系统的性能不会因为网络中节点数目的增加而下降；通过移动终端节点和服务器节点文件共享的实验，证实不能连接到服务器的节点也可以和服务器实现文件共享，而且与每个节点都要主动和服务器共享文件的情况相比，提高了文件共享的效率。%File sharing is one of the most effective ways in working and studying,but it can′t be realized when the network situation is bad or there is no network. For this prolem,a file sharing system implemented on the mobile terminal is proposed,in which the users can organize a network by themselves for file sharing without taking account of the external network environment. The fast file sharing of each node can be accomplished by adopting Ad Hoc network through underlying layer,and by using UDP broadcast within the network. The file sharing experiment within the wireless local area network(WLAN)proves that the perfor⁃mance of the system can′t decrease with the increase of node quantity in the network. The file sharing experiment of mobile ter⁃minal nodes and server nodes proves that the nodes unconnected to the server also can share files with the server. The file sharing efficiency is greatly improved in comparison with the situation that each node has to initiatively connect to the server to share the file.
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