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  Tutorial: Advanced form processing using JSP

This article examines the processing of a user registration form using JSP and JavaBeans while implementing the Memento design pattern.

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Advanced form processing using JSP

Use the Memento design pattern with JavaServer Pages and JavaBeans
rocessing HTML forms sounds like a fairly easy task. For simplistic forms, it usually is. However, this "easy task" (as anyone who has written a halfway sophisticated Web application will confirm) can quickly become tedious. This is because handling HTML forms usually involves a lot more than just parsing the request parameters and outputting a response back to the client. Typically, form processing involves multiple components operating in the background, with each component responsible for a discrete task such as state management, data validation, database access, and so on. While there are numerous examples that demonstrate form processing with Perl scripts and servlets, using JSPs for this purpose has received little attention. There is a reason for this. Apart from the fact that JSP is a fairly new technology, many view it as being suitable mostly for handling the presentation of dynamic content sourced from either JavaBeans or servlets. However, as you shall soon see, the combination of JSP with JavaBeans can be a force to reckon with when processing HTML forms.

In this article, I will examine the handling of a user registration form using JSP. One of the basic programming tenets of JSP is to delegate as much processing as possible to JavaBean components. My JSP form-handling implementation will demonstrate some interesting features. It will not only provide basic data validation for the registration information input by a user, but will also exhibit stateful behavior. This lets you pre-fill the form's input elements with validated data as the user loops through the submission cycle and finally enters the correct data for all of the input elements. So, without further ado, let's dive into the example.


 

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