J2EE Design Patterns Research And Application In CEAIEC Management Information System

Distributed enterprise application software has the characters of complex structure and involving multi technology.Those characters increase the difficult of its development.So it's necessary to apply design pattern—a reusable programming approach,to design and program software system.This paper discusses the development of enterprise's information system for China Eastern Aviation Imp&Exp Corporation(CEAIEC)using J2EE—the most popular specification of distributed object technology.In the process of development and investigation,it is proved that analysis the common features in demand and functions,the application of distributed object technology and the software reuse of well-developed analysis and design results may improve the efficiency and quality in the development of software.Software reuse is the core technique during the development.Design pattern based on the reusable conception is a efficient method to simplify software development processes.In the paper,software reuse technology and methodology are investigated.Then the character of J2EE design patterns is discussed and summarized based on GoF's design patterns.Two kinds of J2EE design patterns are compared and analyzed.Reusable software construction based on J2EE design patterns with high-abstract level is applied to the development of CEAIEC to improve efficiency and quality.It emphases MVC design pattern on the application and implementation of J2EE architecture. Furthermore, structure of web layer is given with the application of front-controller pattern.In business layer,session-Facade pattern is applied for improving performance.Data access object pattern is used in data layer to avoid directly accessing data from data source.Finally,conclusion to this papaer and propose about design pattern are given.