Analysis And Design Of The Application System Based On EJB

EJB (Enterprise JavaBean) is the server-side component model, and its purpose is to develop extensible enterprise distributed application system.The thesis analyzes the framework of EJB and the framework of J2EE in detail. Also it details the component of Bean and deployment of Bean.Meanwhile, the thesis discourses upon the session bean, entity bean, message-driven bean through their definition, persistence, life cycle, use. It emphasizes to analyze the session bean and entity bean and compares the differences between stateful session bean and stateless bean. It discusses the two types of entity bean, BMP and CMP through the view of persistence management, and at the same time, analyzes the differences between session bean and entity bean.At last, it gives an example for describing how to design a whole system based on EJB and detailes the system from requirement to design. Designing the database and using database table buffer technology is to reduce the response time of system. During the course of constructing session bean and entity bean on the server-side, it reduces the pass of the content of entity bean by using value object, realizes the loose coupling of bean by using facade pattern and indirect reference and the key operation of system by using the declare transaction of EJB. However, it uses the MVC pattern on the client side.