By: aathishankaran in Java Tutorials on 2007年02月22日 [フレーム]
The J2EE platform uses a multi-tiered distributed application model. Application logic is divided into components according to function, and the various application components that make up a J2EE application are installed on different machines depending on the tier in the multi-tiered J2EE environment to which the application component belongs. Figure shows two multi-tiered J2EE applications divided into the tiers described in the following list. The J2EE application parts shown are presented in J2EE Components.
Although a J2EE application can consist of the three or four tiers shown in Figure, J2EE multi-tiered applications are generally considered to be three-tiered applications because they are distributed over three different locations: client machines, the J2EE server machine, and the database or legacy machines at the back end.
Three-tiered applications that run in this way extend the standard two-tiered client and server model by placing a multithreaded application server between the client application and back-end storage.
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