Research And Application Of Design Patterns Of J2ee-based Web Component

The paper mainly makes research of representation patterns in J2EE Core Patterns and a few relative patterns in GoF(Gang Of Four). The development of web component in a large and complex web system development is complex and needs a lot of work to do. Although J2EE platform provides many technologies, it doesn't tell how to organize these technologies to resolve problems and how to resolve the problems often to be met in system development. These flaws bring a series of problems, such as period long, fee high and quality unreliable. Design patterns provide a strategy. The paper gives problem description, solution and realized strategy.The paper reviews naissance, development and evolvement of design patterns. It analyzes suitable context of representation patterns, solution and relative UML structure diagram. Through research, the paper gives proposed strategies of intercepting filter, front controller and view helper to be realized, introduces benefits to use these strategies and makes a compare between "service to worker" and "dispatcher view". Combined with JSF framework, it discusses a few patterns of GoF and analyses their context and importance to JSF framework. At last applying Hibernate and Dao pattern resolves database accessing in NUST OA. And with a few patterns of GoF and presentation patterns it resolves a few problems in presentation tier, such as request handling, client authentication and composite view management.