JSP - XML Data
JSP - XML Data
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 data 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
|
|
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