The Study And Implement On Web Application Model Based On J2EE Design Patterns

With the development of Internet, the developing technology on Web application have transferred from traditional WEBSERVER/CGI/DB to distributed application based on J2EE,CORBA or .NET. Faced with the increasing complex software developing, the traditional developing method and dated design idea can,t satisfied with the demand of enterprise and distributed application todays. So people need a better design patterns and mature soft architecture to improve the stability and efficiency of soft developing..In order to response to this request, J2EE appear. It,s a middleware architecture released by Sun MicroSystem Inc, which is a platform. Using uniform standard and technology on this platform, People can simplified many complex problems relate to enterprise application developing, deployment and management.Although J2EE have achieved the goal of reuse on code level with component technology, The study on reuse on design level by design patterns is still a focus of many people.In order to extend the J2EE application, some institution and specialist collection some J2EE core patterns, which provide the best strategy and solution in J2EE developing.Due to poor design of many Web applications, which prevent the soft reuse. This paper firstly submit a Web application model according to J2EE core patterns, then use a application instance to describe the application of this model. Finally , it discuss the software reuse idea and its new development. The paper contains five parts:Part 1 Introduce the development of software reuse, origin of design patterns and the classification of GoF patterns.Part 2 Firstly, introduce the development of enterprise application. Then.introduce the structure and component of J2EE .Finally, introduce the J2EE core patterns definition, classification and applicability.Part 3 Submit a Web application model, and apply it to a instance, then introduce it requirement analysis, structure design and some design strategy and frameworks.Part 4 According to the design above, describe it implements from Web layer and business layer, and introduce the application of those core patterns through this instance.Part5 Sum up the study of this paper and give a prospect of this study fields.