Research And Application On The Middleware Technology Of Water Resources Domain

Based on the characteristics of the applications in water resources information, an application framework, that is oriented to water resources domain, is presented and achieved in this paper. The technology of J2EE and EJB in water resources domain is introduced. This framework can be served in the flood control and dispatch system. The architecture and related key technology in the framework are analyzed theoretically in detail. Various technologies applied in water resources domain are also discussed in this paper, such as dynamic formation and publication of Servlet and JSP, naming and directory services JNDI, distributed object architecture EJB, database interface supported JDBC, methods dealing with heterogeneous databases and the relationship and collocation between layers in multi-layers architecture.The distributed system with the framework is strictly divided into five layers from the bottom to the top: data layer, data integration layer, transaction logic layer, interface control layer and user interface layer. Within this application framework, a multi-layer distributed application system is built, integrating real-time engineering information inquiry system and real-time flood information system. Based on industry standardization, the application system functions component reuse, openness function and access to heterogeneous databases, providing services for practical application of water resources information in China on a large scale, promoting innovation and great development of the middleware technology in the process of water resources information.