Research on Data Expression in J2EE Architecture System

J2EE architecture has many complicated layers, including client, presentation, business logic and data persistence layer. There is respective data presentation in relevant layer of J2EE, with strictly rules to access and transform data objects between these layers. Through the concrete example of engineering application, this paper analyzes the above layers; discuss the data expression of J2EE and the detailed data expressing methods in corresponding layer with some instances. According to the Façade pattern, In J2EE, it should control the access to data persistence layer seriously to protect important enterprise data and avoid showing database pattern to client directly.