Application And Research Of J2EE Design Pattern For Enterprise Information System

With the development of the enterprise, the scale of the Enterprise Information System (EIS) is being larger and larger, and the requirements of the enterprise are changing too. So the EIS must be more adaptive. J2EE has been used by more and more programmers in the EIS as its many advantages such as flexibility, agility and maintainability ...etc.Just as this background, the thesis discusses how to use design pattern to improve the reusability,flexibility and maintainability of the information system beginning from J2EE design pattern. First, the paper introduces the technology and the background of knowledge associated with the development of the system. After the analysis of the system function and the entire structure design based on MVC, the thesis then emphasizes two points. On one hand the paper introduces a method using DAO pattern to solve the depending problem of the persistent storage when data accessing the client and makes a new way to solve object-type depending problem in DAO pattern; on the other hand the paper describes the enterprise information query module focusing on enterprise large data query, and discusses how to build a dynamic WEB query module basing on the design thought of dividing hierarchy model in the J2EE framework with design pattern, XML and other technologies related. Through the analysis of the persistent depending problem and the realizing of the enterprise information query module, the paper describes the method of the application of J2EE design pattern in EIS can improve the flexibility and maintainability of the system and the interactivity with other system effectively, and can provide some valuable suggestions for later enterprise information system. At last the paper puts forward some propositions of the disadvantages of the system and anticipates a future research of this field.