| With the globalization of information and economics, the internet has become a new information system platform, and the application based on the Web technology has become more and more extensive. However, the current Web application systems have many frequent disadvantages that make it is hard to reuse, maintain, adapt to new requirements, and so on. Therefore, it has been a focus to study how to create more powerful and flexible applications. To achieve this, developing methodology and system architecture design are crucial.At present, the Web application process development includes two methods, one is the traditional method and the other is based on MVC(Model View Controller)design pattern. With MVC pattern, programmer, disadvantages of traditional method can be avoided, for it separates the business logic from display logic. Therefore, the second development method is the first choice for developers.This paper introduces the architecture and the realization of the Online Suspected Criminal system based on J2EE, The system achieve the information exchange for Police. The system employs J2EE three-tier based structure. Browser provides visual graphic interface; Web Server responds to the requests of the clients; Application Server processes application, computation and data operation; DB Server stores and administrates information.This paper dissertates the process of the development of the Online Suspected Criminal system which is divided into 3 phases according to the software engineering ideology: In needs analysis phase, this paper established the Functions Model using the UML system to determine the structure and behaviour; In the system design phase, this paper discussed the database system designing and Identified the system steps; In the Realization phase, this paper elaborated the realization of the Online Suspected Criminal system based on J2EE. In the final, this paper summarized the advantages of the system. |
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