Tutorials : Create an XML Web Application with Struts, Xerces, and Xalan :

The Sample Implementation

Figure 1: The Sample UML Segence Diagram

This is the typical path for all calls. While users are browsing your pages, they are forced to go to the Struts Controller, which selects the appropriate Action class. In turn, the Action class performs all the necessary calculations, operations, etc. and the result data is placed into a JavaBean. This bean is placed into a request (session, application) scope and a JSP page. The JSP page uses the data (from the JavaBean inside the request scope) to create a presentation view.

What about this "typical" process will you need to change? Without a doubt, you'll want to get rid of the JSP pages. With each Action code, you can create XML document with the result data, apply the XSLT stylesheet to it, and output everything. However, this working solution is a bit crude. Here's a much more elegant scheme. Follow the typical process. The result Java Bean gets created and put into the request scope. But now, return the control to the special XML/XSLT controller. Now, the sequence diagram looks like Figure 2.

Figure 2: The Improved Sample UML Segence Diagram

The XML/XSLT controller, with the help of the java.beans.Introspector, learns about properties and methods supported by the result JavaBean from the request scope. The controller uses this information, along with the DOM (Document Object Model) API, to create an XML document.

The following code is an example of the JavaBean class filled with result data:

public class SomeResultBean {
   private String textField1;
   private String textField2;
   ...
   // getters and setters below
   ...
}

<?xml version="1.0" ?>
<root>
	<SomeResultBean>
		<textField1> some value </textField1>
		<textField2> other value </textField2>
		...
	</SomeResultBean>
</root>

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