Design And Implementation Of Coal Contract Management System On J2EE

The thesis introduces the architecture of the Web application system based on J2EE multi-tier structure and Middleware technology, and discusses in detail of the platform of coal contract management on analysis, design and key-technology.The system uses UML method to analyze, and then create the function model and object model. Through creating the model, we can preferable understand the system. The System is divided into three sub-systems according to its' function, they are member administration, on-line trade and statistic administration. The system involves all types of data information.The system employs J2EE multi-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; Database Server stores and administrates information. The implementation of multi-tier structure enables the system to have distinguished quality of flexibility, currency, compatibility and maneuverability. The system applied Java encrypt technology to accomplish client information encrypt and registration, and applied connection pool technology to enhance the database operation efficiency.The system adopts C/S(applet) and B/S(jsp,Servlet) combined structure to realize the data access based on Web. And with the application of middleware technology, the efficiency and quality of the development is greatly improved and the work of maintenance is reduced.