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Using XSL file to render output HTML while using Struts 2.1.6 Framework

There is a specific Result type as XSLTResult, that is defined in the
default Struts XML  file, so is available to use in any Struts 2
framework based application.

In this example I shall be showing one out of several ways by which
one may use a XSL file for rendering HTML output/screen from a
Struts2 based Action/POJO class.

In this example we have a struts.xml file, a POJO, a index.jsp file,
a XSL file, these are placed in appropriate places inside the
web application packaging, for this example it is shown as follows:


/*/WEB-INF/classes/struts.xml
/*/WEB-INF/classes/sample/ExampleXSLTAction.java
/index.jsp
/sources/test.xslt



What I am doing here is to show a screen to enter two values, such as
header and footer. These two text fields are mapped to the two
variables in POJO, "ExampleXSLTAction", and then forwarding to a preview
result having type as "xslt" and style sheet location as the xslt file
located in the sources folder.











struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
  <package name="xslt-example" namespace="/sample"
           extends="struts-default">
     <action name="test" class="sample.ExampleXSLTAction"
	                 method="preview">
        <result name="preview" type="xslt">
           <param name="stylesheetLocation">
	        /sources/test.xslt
	   </param>
        </result>
        <result name="input">/index.jsp</result>
     </action>
  </package>
</struts>



When the URL for accessing this example web application as,

http://localhost:8080/struts2sample

Then the index.jsp will be showing the user UI screen as follows:
And the second screen one clicking submit button.



ExampleXSLTAction.java

package sample;

public class ExampleXSLTAction {
	private String testHeader;
	private String testFooter;
	public void setTestHeader(String arg) {
		testHeader = arg;
	}
	public String getTestHeader(){
		return testHeader;
	}
	public void setTestFooter(String arg) {
		testFooter = arg;
	}
	public String getTestFooter(){
		return testFooter;
	}
    public String preview() throws Exception {
		if((testHeader != null && testHeader.length() >0) &&
			(testFooter != null && testFooter.length() <0))
            return "preview";
		else
            return "input";
	}
}



This POJO class file does only checking of the input values in
these two text fields, testHeader and testFooter.

test.xslt

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0">
<xsl:output method="html"/>
<xsl:template match="result">
<html>
<body>
      <h4><xsl:value-of select="testHeader"/></h4>
      <br/>
      <xsl:value-of select="testFooter"/>
</body>
</html>
</xsl:template>
</xsl:stylesheet>



This XSLT file, takes values from the ExampleXSLTAction object
and displays on screen as shown in this image


And following image shows a very simple way of putting various
major parts/files of this example and the way fields/attributes
are used/referred in each of these files.




index.jsp

<%@ taglib uri="/struts-tags" prefix="struts2"%>
<html>
<head>
</head>
<body>
<struts2:form method="post" action="test" namespace="/sample">
<table>
<tr><td><struts2:textfield key="testHeader"
                   label="Enter Header :"/></td></tr>
<tr><td><struts2:textfield key="testFooter"
                   label="Enter Footer :"/></td></tr>
<tr><td colspan="2"><struts2:submit value="Register"/></td></tr>
</table>
</struts2:form>
</body>
</html>



This way I could able to pass dynamic values from Action class/POJO
to the XSLT processor for displaying output in HTML format.
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