When you send XML data via HTTP, it makes sense to use JSP to handle
incoming and outgoing XML documents for example RSS documents. As an XML
document is merely a bunch of text, creating one through a JSP is no
more difficult than creating an HTML document.
Sending XML from a JSP:
You can send XML content using JSPs the same way you send HTML. The
only difference is that you must set the content type of your page to
text/xml. To set the content type, use the <%@page%> tag, like
this:
<%@ page contentType="text/xml" %>
Following is a simple example to send XML content to the browser:
<%@ page contentType="text/xml" %>
<books>
<book>
<name>Padam History</name>
<author>ZARA</author>
<price>100</price>
</book>
</books>
Try to access above XML using different browsers to see the document tree presentation of the above XML.
Processing XML in JSP:
Before you proceed with XML processing using JSP, you would need to
copy following two XML and XPath related libraries into your <Tomcat
Installation Directory>\lib:
Let us put following content in books.xml file:
<books>
<book>
<name>Padam History</name>
<author>ZARA</author>
<price>100</price>
</book>
<book>
<name>Great Mistry</name>
<author>NUHA</author>
<price>2000</price>
</book>
</books>
Now try the following main.jsp, keeping in the same directory:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
<html>
<head>
<title>JSTL x:parse Tags</title>
</head>
<body>
<h3>Books Info:</h3>
<c:import var="bookInfo" url="http://localhost:8080/books.xml"/>
<x:parse xml="${bookInfo}" var="output"/>
<b>The title of the first book is</b>:
<x:out select="$output/books/book[1]/name" />
<br>
<b>The price of the second book</b>:
<x:out select="$output/books/book[2]/price" />
</body>
</html>
Now try to access above JSP using http://localhost:8080/main.jsp, this would produce following result:
Books Info:
The title of the first book is:Padam History
The price of the second book: 2000
Formatting XML with JSP:
Consider the following XSLT stylesheet style.xsl:
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl=
"http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="html" indent="yes"/>
<xsl:template match="/">
<html>
<body>
<xsl:apply-templates/>
</body>
</html>
</xsl:template>
<xsl:template match="books">
<table border="1" width="100%">
<xsl:for-each select="book">
<tr>
<td>
<i><xsl:value-of select="name"/></i>
</td>
<td>
<xsl:value-of select="author"/>
</td>
<td>
<xsl:value-of select="price"/>
</td>
</tr>
</xsl:for-each>
</table>
</xsl:template>
</xsl:stylesheet>
Now consider the following JSP file:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
<html>
<head>
<title>JSTL x:transform Tags</title>
</head>
<body>
<h3>Books Info:</h3>
<c:set var="xmltext">
<books>
<book>
<name>Padam History</name>
<author>ZARA</author>
<price>100</price>
</book>
<book>
<name>Great Mistry</name>
<author>NUHA</author>
<price>2000</price>
</book>
</books>
</c:set>
<c:import url="http://localhost:8080/style.xsl" var="xslt"/>
<x:transform xml="${xmltext}" xslt="${xslt}"/>
</body>
</html>
This would produce following result:
Books Info:
| Padam History | ZARA | 100 |
| Great Mistry | NUHA | 2000 |
For more detail on XML processing using JSTL, you can check
JSP Standard Tag Library
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