【作者】 史宇清；

【导师】 宗平；

【作者基本信息】 河海大学 ， 计算机应用技术， 2004， 硕士

【摘要】 本文针对水利信息化应用所具有的特点，为国家防汛指挥系统工程服务，将J2EE和EJB技术应用到水利领域，提出并实现了面向水利领域的应用框架。同时侧重对其中的关键技术、体系结构进行理论分析，研究动态生成并发布Servlet和JSP、命名和日录服务JNDI、分布式对象体系结构EJB、数据库接口支持JDBC和异构数据库的处理以及多层体系结构各层之间的联系和搭配等在水利领域的实际应用。 本文提出并实现的应用框架将分布式系统自底向上严格地分为五层：数据层、数据集成层、业务逻辑层、界面控制层和客户界面层。本文利用该应用框架建立了面向水利领域的分布式多层应用系统：实时工情查询系统和实时水情查询系统，实现了在行业标准化基础上的构件复用、门户功能和异构数据库的访问。为国家水利信息化全面实施提供应用服务，并促进中间件技术在水利信息化应用领域的创新和跨越式发展。更多还原

【Abstract】 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.更多还原