The Technology And Implement Of Virtual Reference System In Digital Library

With the instauration of digital libraries, a lot of electronic literature resource purchased, special databases and subject navigation systems self-constituted are provided. These resources provide influence literature deposits and retrieve services. A real-time online virtual reference platform is offered for the readers when they encountered some difficulties during using library resources.Many universities' libraries established the virtual reference service systems which offer several services for users by using web pages, and which make reference service beyond the space-time limits and supply real-time services for users.In this paper, the definition, character, the service methods used of virtual reference are recommend, moreover the key technology and research for building a virtual reference platform are discussed deeply. By studying on Sharing Application mechanism, Java Multi-threads, J2EE architecture, MVC framework, the design thinking and the system realization are expounded in detail. And the design and realization of the key function modules are offered, for example: text reference, E-whiteboard and Co-browse module.In order to share the knowledge of reference questions among several libraries, how to use Z39.50 protocol to provide distributed searches in several information fountain is investigated at last in paper. Z39.50 protocol mechanism and theory, Z39.50 gateway are discussed and the distributed retrieve of reference knowledge using Z39.50 gateway is realized.