图书管理系统外文翻译(11)

图书管理系统外文翻译

This is clearly an application that can benefit from using a combination of JSP pages and the component types defined by the servlet specification for the MVC roles. Let's look at the main requirements and see how we can map them to appropriate component types:

Database access should be abstracted, to avoid knowledge of a specific data

schema or database engine in more than one part of the application: beans in the role of Model can be used to accomplish this.

The database access beans must be made available to all other parts of the

application when it starts: an application lifecycle event listener is the perfect component type for this task.

Only authenticated users must be allowed to use the application: a filter can

perform access control to satisfy this requirement.

Request processing is best done with Java code: a servlet, acting as the Controller,

fits the bill.

It must be easy to change the presentation: this is where JSP shines, acting as the

View.

Adding servlets, listeners, and filters to the mix minimizes the need for complex logic in the JSP pages. Placing all this code in Java classes instead makes it possible to use a regular Java compiler and debugger to fix potential problems.

Centralized Request Processing Using a Servlet

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