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Locate a Node and Change Its Content
Posted on: August 24, 2008 at 12:00 AM

In this section, you will learn how to change the Content of a node in a DOM document.

Locate a Node and Change Its Content

This Example shows you how to Change the Content of a node in a DOM document. JAXP (Java API for XML Processing) is an interface which provides parsing of xml documents. Here the Document BuilderFactory is used to create new DOM parsers. These are some of the methods used in code given below for adding attribute:-

Element root = doc.getDocumentElement():-direct access to the root of the DOM document.

NodeList childnodelist = root.getChildNodes():-created a childnodelist and get the collection of child nodes of this node.

Xml code for the program generated is:-

<?xml version="1.0" encoding="UTF-8"?>
<Company>
<Employee>
<Employeename>Girish Tewari</Employeename>
<email>girish@gmail.com</email>
</Employee>
<Employee>
<Employeename>Komal</Employeename>
<email>Komal@gmail.com</email>
</Employee>
<Employee>
<Employeename>Mahendra</Employeename>
<email>dhoni@gmail.com</email>
</Employee>
</Company>

Changecontent.java :-

/* 

         * @Program that Locate a Node and Change Its Content

         * UsingSibling.java 

         * Author:-RoseIndia Team

         * Date:-09-Jun-2008

         */

        

        import java.io.*;

        import javax.xml.parsers.*;

        import org.w3c.dom.*;

        

        public class Changecontent {

        

          public static void main(String[] args) throws Exception {

          boolean validating = false;

          DocumentBuilderFactory factory = 

  DocumentBuilderFactory.newInstance();

          factory.setValidating(validating);

        

          Document doc = 

  factory.newDocumentBuilder().parse(new File("2.xml"));

          new Changecontent().changeContent(doc, 

   "Girish Tewari", "@Rose.com");

        }

          public void changeContent(Document doc, 

  String newname, String newemail) {

        

          Element root = doc.getDocumentElement();

          

          //creating a nodelist

          NodeList childnodelist = root.getChildNodes();

          for (int i = 0; i < childnodelist.getLength(); i++) {

          

          Node childnode = childnodelist.item(i);

          Node subchildname = childnode.getFirstChild();

          Text text = (Text) subchildname.getFirstChild();

          String oldname = text.getData();

          //compares oldname with newname

          if (oldname.equals(newname)) {

          //gets the next node of the subchild

          subchildname=subchildname.getNextSibling();

          System.out.println(subchildname.getNodeName());

          text =(Text)subchildname.getFirstChild();

          System.out.println("Old e-mail id: "

  +text.getData());

          text.setData(newemail);

          System.out.println("New e-mail id: "

  +text.getData());

          }

        

          }

        

          }

        }

Output of the program:-

email
Old e-mail id: girish@gmail.com
New e-mail id: @Rose.com

DownLoad Source Code

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