Web Instruction Platform's Design And Implement Based On J2EE Structure

With the development of computer network technology, especially Internet technology, distance learning based on web has became an important mode and developmental way in the distance education. Distance learning is the outcome of applying computer and network communication technology into educational field. It have made great and far-reaching influence on education structure and it is a popular trend of education development in the future.This system implemented a web instruction platform that adopted J2EE four-tier structure. J2EE is a developmental criterion of enterprise application system based on component technology. J2EE defines a multi-tier EIS' standard platform. As a technologic criterion, J2EE have already been used broadly in network and e-business. Therefore, such a criterion that defines an open multi-tier structure is greatly fitting to develop web instruction platform for distance education. J2EE four-tier structure includes: Client Tier that provides GUI for clients, Web Tier that responses the request of clients and provides data for clients, EJB Tier that completes the computation and data-operation of clients requests, EIS Tier that stores and administrates data information. The implementation of J2EE four-tier structure enables the system to have distinguished quality of flexibility, compatibility, maneuverability. Because this system adopts B/S pattern, clients only need browser and operation is made very easy.This system have three status, including administrators, teachers, students. This platform have strong function and practicability, such as students learning, teachers teaching, education management etc. This paper introduces the central technology of J2EE, the process from the initial design to developmental system using J2EE technology and the system's deployment.