| The modern long-distance learning is one kind of new education patterns which constructs the lifelong study in the knowledge economy time.Based on the Web long-distance teaching platform which can display adequately the superiority of Information technology in the teaching,manifest the student as the main body and the teacher as the leadership's teaching idea,It will be a tendency in the future teaching development.According to J2EE four construction system and the lamination design concept, this article has designed an expandable long-distance teaching platform.This teaching platform provides the succinct man-machine interaction contact surface through the customer level;response user request through web level;completes the computation and logical processing by using the service level;provides the service of data storage by data level.This article focuses on a component-based N-tier distributed architecture,as well as how to use the advanced component-based development methods and middleware technology,In order to realize each kind of service logic and data logic about the long-distance teaching platform.This platform unifies the Struts frame and Hibernate technology to process the page logic and the object lasting work in the application development processes, uses the Ajax technology to realize the custom-made function and provides the non-revolution friendly management contact surface for users.Finally,this article tries to analyze and discuss this teaching platform's safety mechanism.The development practice indicated that uses the J2EE four construction technology,enables the teaching platform to have the strong elasticity,the versatility,the compatibility and the extendibility. Each level ,which can concentrate the specific role and the function and perform its own functions,is mutual non-interference。This teaching platform ,which uses the B/S pattern and the client side only needs the browser to be possible to realize the network teaching,operates conveniently and simply. |
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