The Design And Implementation Of Early-warning System Middleware In Rural Environment

With the rapid development of computer technology, a wide variety of application software needs to be transplanted in different platforms, or a platform needs to support multiple software applications. Multi-application system, software and hardware platform and application system needs a reliable and efficient data transfer and conversion. In order to solve these problems, people begin to pay attention to the middleware.With the fast development of distributed application system, study on middleware has been sprouting quietly. In the software architecture, three or more layer architecture has gradually become the new mainstream. The three layer architecture refers to the client layer, logic layer and data layer. The client layer can be used directly by software users. The logic layers focus on transaction processing, also known as the middle layer. This architecture has changed the traditional client-server model, becoming a more effective solution.In this paper, we built a system based on C/S+B/S and three layer architecture, relying on the powerful J2 EE platform and the open source framework, Jersey, Hibernate, and Spring. The middle layer is in the service of four objects, respectively, the external data source end, Web client, PC data processing terminal, intelligent mobile phone terminal. The middle layer is to focus on the global transaction management and conflict management mechanism, coordination of unified management of all clients, making all nodes organically, realizing the intercommunication between each other and resource information sharing.The System software platform we used in this study is the Windows+Myeclipse+ DB2. Environmental data includes economic development, social development, environmental quality, resource and environment and management indicators, which are all stored in the DB2 database. Applications gain data through the RESTful Web Service composing of Jersey, Hibernate and Spring, which sees the data stored in DB2 as resource information entities. The middle layer receives a client request, and sends the text in XML format. The application access the resource(an entity) by visiting URI. This scheme avoids the possibility that application has database access, prevents the database from direct interaction with the application, which improves the security level of the system.