Research And Application Of Bussiness-Tier Model

With the Internet popularizing, the complication of Web application is constantly increasing, and its scale is enlarging as well. In order to content the higher request to the flexibility, reliability and individuation, The Web Application faces the new challenge.In nowaday Web development, MVC pattern provide the beneficial thought for separating and enclosing the interface expression, controlling flow and business logic. Resulting, many Web application frameworks appears based on J2EE. However, most Web development based on MVC pattern focus controlling flow and page expression rather than thinking much of the reusability of the business logic model. It makes the disjoin of between business logic model and real design model. This develop mode disobeys the Object-Oriented principle, and most Web development have this common defect. So it's hard to maintain and expand the system, not even the software reusing.Spring framework is an Open Source Engineering which started from February 2003, it mostly rooted in the book written by Rod Johnson. In this book, Rod Johnson advocated the design idea of J2EE practicality, and provided a primary development framework implement. On this foundation, Rod Johnson had a farther reconstruction and extension to develop it as a new development framework, which is Spring framework. It provides IoC container and AOP support to reduce the coupling between the tiers so that more attention can be paid on designing business logic on business tier.This paper researches the kernel technique of business tier model, and utilizes the Spring as base framework, with the ideology of domain model and design pattern, provides the design method of business tier. Accordingly, reusability and flexibility of business tier will be improved immensely. In practice, the framework in terms of the principle of "interface oriented", designs and actualizes the development of web application system,in order to improve the reuse and extension of business layer. It proved that design method of business tier has a very important directive meaning and practical value for the development of application systems.