Application And Research Of EJB Component Technology In EGS

With the development and population of computer network technology, information-ization has been influencing every sides of the society. At present,E-govemment is the main task of informationization in our country,the governments at all levels are constructing their own E-govemment system(EGS).To get success in EGS,the good expansibility and transplantation must be sured.On the other hand,the architecture and supporting environment of distrubuted component technology has further developed. The distributed component technology is good at system's processing ability,collaboration, reliability and expansibility.So the current main distributed component technology~EJB is discussed in this paper. EJB is a kind of cross-platform component architecture which is used for developing and deploying multi-tier structure, distributed, object-oriented Java application. This paper firstly introduces J2EE technical specification briefly, then it explains the EJB architecture and session bean, entity bean and message-driven bean in details, and has made a concrete analysis of their life cycle and characteristic. At last,it discusses the application of EJB in EGS and gives the frame code of implementing EJB technology.EJB does well in developing distributed application system.By offering the unified developing platform, it reduces the complexity of developing multi-tier application and resolves the problems of expansibility and transplantation in EGS.