First DOM Application

I am going to explain simple DOM Application.

Parsing xml file using DOM parser is a 3 step process.

Step 1: Get the instance of BuilderFactory class.

Ex: DocumentBuilderFactory builder = DocumentBuilderFactory.newInstance();

Step 2: Instantiate DocumentBuilder object.

Ex: DocumentBuilder docBuilder = builder.newDocumentBuilder();

Step 3: Get the Document object using the parse method of DocumentBuilder instance.

Document document = docBuilder.parse("employee.xml");

Employee.xml

<?xml version="1.0"?>
<employees>

 <employee id="1">
  <firstname>Hari Krishna</firstname>
  <lastname>Gurram</lastname>
  <address>
   <area>Marthali</area>
   <city>Bangalore</city>
   <state>Karnataka</state>
   <country>India</country>
  </address>
 </employee>
 
 <employee id="2">
  <firstname>Joel Babu</firstname>
  <lastname>Chelli</lastname>
  <address>
   <area>Jubli Hills</area>
   <city>Hyderababd</city>
   <state>Andhra Pradesh</state>
   <country>India</country>
  </address>
 </employee>
 
 <employee id="3">
  <firstname>Susantha</firstname>
  <lastname>Sarm</lastname>
  <address>
   <area>Gandhi Nagar</area>
   <city>Bhuvaneswar</city>
   <state>Orissa</state>
   <country>India</country>
  </address>
 </employee>

</employees>

import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class DomParser {

    static Document parseDoc(String doc) throws ParserConfigurationException, SAXException, IOException{
        /* 1. Get the instance of BuilderFactory class. */
        DocumentBuilderFactory builder = DocumentBuilderFactory.newInstance();

        /* 2. Instantiate DocumentBuilder object. */
        DocumentBuilder docBuilder = builder.newDocumentBuilder();

        /* Get the Document object  */
        Document document = docBuilder.parse("employee.xml");

        return document;
    }

    public static void main(String args[]) throws ParserConfigurationException, SAXException, IOException{
        Document document = parseDoc("employee.xml");

        System.out.println("Root element :" + document.getDocumentElement().getNodeName());
        System.out.println("Employee Details");

        NodeList nList = document.getElementsByTagName("employee");

        for (int i = 0; i < nList.getLength(); i++) {
            Node nNode = nList.item(i);
            if (nNode.getNodeType() == Node.ELEMENT_NODE) {
                Element eElement = (Element) nNode;
                System.out.print(eElement.getElementsByTagName("firstname").item(0).getTextContent()+"\t");
                System.out.print(eElement.getElementsByTagName("lastname").item(0).getTextContent()+"\t");
                System.out.print(eElement.getElementsByTagName("area").item(0).getTextContent()+"\t");
                System.out.print(eElement.getElementsByTagName("city").item(0).getTextContent()+"\t");
                System.out.print(eElement.getElementsByTagName("state").item(0).getTextContent()+"\t");
                System.out.println(eElement.getElementsByTagName("country").item(0).getTextContent());
            }
        }
    }
}

Output

Root element :employees
Employee Details
Hari Krishna        Gurram        Marthali        Bangalore        Karnataka        India
Joel Babu        Chelli        Jubli Hills        Hyderababd        Andhra Pradesh        India
Susantha        Sarm        Gandhi Nagar        Bhuvaneswar        Orissa        India

 

Prevoius                                                 Next                                                 Home