Study On The J2EE Core Pattern And Its Application To The Information System Of Low Voltage Distribution

With the high-speed development of current science and technology, enterprise's commercial affair is complicated day by day on logic actually, distributed and melted day by day on the region, the traditional client/server model isn't suitable for the basic architecture of enterprise management system any longer. J2EE, which leaded by Sun Microsystem Corporation, is a n-tier based, distributed application design environment. J2EE contain a series of services,APIs and protocol which provide strong support to the development of web based multi-tiers application. But it is not enough to develop robust, extensible and easy maintained application that we just know the technique details of the J2EE platform. We also need to know when and how to use those J2EE APIs correctly. J2EE core design patterns root in the practice of many experts in studying J2EE platform and technique. J2EE pattern can redound to accumulating and transferring the experience of J2EE platform. It can help us to record and communicate the solution which has been proved to be right. Such solution can resolve the problems which occurred in different environment. With J2EE pattern,we can avoid the repeated investment during developing J2EE based application. It's aimed at studying on several kinds of J2EE core patterns that are nowadays accepted in the develop-field. Those patterns contain the whole tiers. Every pattern is analysed detailedly and pointed out its advantage and applicable area. Then, it's studied and probed that how to choose and apply effectively core patterns in the course of developing, combining the successful experience and failed case of the project. At the end,an example is provided to demonstrate how to combine all the J2EE core patterns together to construct an information system of low voltage distribution. The example isn't complicated,but its design and code according to the J2EE pattern strictly.