Example of printing Text message passed from XML to JSP
In this tutorial we are going to know how we can pass a
text message from XML to JSP.
This example will examine how to parse and expose XML
information using the JAXP with a JSP page. This tutorial is only
geared towards showing how to construct a Java object from an XML
document. For this what we need is a XML file in which we have some text
data which needs to be retrieved and inserted into the jsp page. What we need to
learn is to retrieve the data from the XML file and insert it into the jsp
page.
To make a program over it we have used the following page
directive attributes, the first attribute we have used is contentType and
the second attribute is import. The content type tells about the MIME
type and character encoding the JSP file uses for the response it sends
to the client. We need to import some classes and packages which we have
described in the tutorial.
The logic of the program is written inside the
scriptlet. Now inside the scriptlet firstly we will
define a factory API which allows our application to obtain a Java
XML parser. DocumentBuilderFactory defines a factory API.
Now create a DocumentBuilder object to parse an org.w3c.dom.Document
from XML. Save the xml file at bin file of C:\apache-tomat-5.5.23\bin\.
For that we need to parse method to actually parse the XML file to create
our own Document object. Document object will be created by parse
method of the DocumentBuilder.
From the Document object we will get a NodeList
object represents all of the elements in our XML document name message. NodeList
object will be obtained by the getElementByTagName().
A NodeList is an array starting from 0 and going
up to the length of the array by calling getFirstChild() method. By using
this method the desired text node is returned and we can use getNodeValue()
for our message.
Now you can better understand the use of xml. For this
program to run we need to import one jar file i.e itext.
Code of the message.xml
file:
<?xml version="1.0" encoding="UTF-8"?>
<messages>
<message>Hello Rose India Pvt Ltd</message>
</messages>
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Here is the code of the do_message.jsp
file:
<%@ page contentType="text/html"%>
<%@ page import="javax.xml.parsers.DocumentBuilderFactory,
javax.xml.parsers.DocumentBuilder,org.w3c.dom.*"
%>
<%
DocumentBuilderFactory dbf =
DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse("\\message.xml");
NodeList nl = doc.getElementsByTagName("message");
%>
<html>
<body>
<%= nl.item(0).getFirstChild().getNodeValue() %>
</body>
</html>
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The output of the program is given below:
Download do_message.jsp
file.
Download message.xml file.
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