The Design And Realization Of EJB-Based Application Architecture

Since 1990s,whh the development of web and related technologies such as Java technolog, the original computer an hecturehasdewtopedfiom 24edC/Sarcnitecturetothe 3-tiedC/S architecture, and been realizing the popular J2EE application architecture. The EJB-Based 3-tied architecture is one important part of J2EE application architecture.This paper focuses on the design and realization of EJB-Based 3-tied C/S structure, and the design model based on the MVC frame is applied in the system development, so that the separation between the present tog^ arnd the business logic in the application is realized In order to improve the performance of data storing and taking, we introduce the FACADE model to encapsulate the EJBs which delegate the data model In addition, how to integrate heterogeneous sources with different EJB servers and how to update the distributed heterogeneous sources with DTP piocess are discussed in this paper. An example of realizing a company's sale-management procedure is demonstrated in this paper, this project is designed by UML, the EJB business components in the application server are visited by a client and system's present layer is realized by the JSPs. This paper concentrates on the ways and advantages of deploying the EJBs by CMP and realizing the update of the distributed heterogeneous sources.WebSphere application server of IBM Corporation is chosen as the deployed platform. The 3-tied C/S application based on the EIBs is realized with the VisualAge for Java...