Parsing XML Document

In this tutorial you will learn about the parsing XML document using DOM

Parsing XML Document

We have used following XML file in example

student.xml

<?xml version="1.0"?>
<SCHOOL>
<STUDENT>
<ROLL>01</ROLL>
<NAME>Tom</NAME>
<AGE>22</AGE>
<COURSE>MBA</COURSE>
<ADDRESS>Delhi</ADDRESS>
</STUDENT>
<STUDENT>
<ROLL>02</ROLL>
<NAME>Rao</NAME>
<AGE>21</AGE>
<COURSE>BBA</COURSE>
<ADDRESS>Ranchi</ADDRESS>
</STUDENT>
<STUDENT>
<ROLL>03</ROLL>
<NAME>Singh</NAME>
<AGE>23</AGE>
<COURSE>MBA</COURSE>
<ADDRESS>Patna</ADDRESS>
</STUDENT>
<STUDENT>
<ROLL>04</ROLL>
<NAME>Amoo</NAME>
<AGE>22</AGE>
<COURSE>MBA</COURSE>
<ADDRESS>Lucknow</ADDRESS>
</STUDENT>
</SCHOOL>

To parse XML document do the following

• Create a file Object as  File xmlFile = new File("G:\\xmlfiles\\student.xml");
• Create DocumentBuilderFactory instance and get DocumentBuilder instance from it.
• Then normalize the document and get the NodeList of the STUDENT element as follows

DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
		.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory
		.newDocumentBuilder();
Document document = documentBuilder.parse(xmlFile);
document.getDocumentElement().normalize();
NodeList nodeList = document.getElementsByTagName("STUDENT");

• Finally create a loop to get all the "STUDENT" elements and then get all the child nodes as
  

  for (int i = 0; i < nodeList.getLength(); i++) {
  		Node node = nodeList.item(i);
  		if (node.getNodeType() == Node.ELEMENT_NODE) {
  			Element element = (Element) node;
  			
  			NodeList rollNodeList = element.getElementsByTagName("ROLL");
  			Element roll = (Element) rollNodeList.item(0);
  			NodeList rollNode = roll.getChildNodes();
  			System.out.println("Roll : " + ((Node) rollNode.item(0)).getNodeValue());
  	}
  }
  

  
  

The Complete exaple is given below

DomXmlParsingExample.java

package dom;

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class DomXmlParsingExample {
	public static void main(String argv[]) {

		try {
			File xmlFile = new File("G:\\xmlfiles\\student.xml");
			DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
					.newInstance();
			DocumentBuilder documentBuilder = documentBuilderFactory
					.newDocumentBuilder();
			Document document = documentBuilder.parse(xmlFile);
			document.getDocumentElement().normalize();
			NodeList nodeList = document.getElementsByTagName("STUDENT");
			
			for (int i = 0; i < nodeList.getLength(); i++) {
				Node node = nodeList.item(i);
				if (node.getNodeType() == Node.ELEMENT_NODE) {
					Element element = (Element) node;
					
					NodeList rollNodeList = element.getElementsByTagName("ROLL");
					Element roll = (Element) rollNodeList.item(0);
					NodeList rollNode = roll.getChildNodes();
					System.out.println("Roll : " + ((Node) rollNode.item(0)).getNodeValue());
					
					NodeList nameNodeList = element.getElementsByTagName("NAME");
					Element name = (Element) nameNodeList.item(0);
					NodeList nameNode = name.getChildNodes();
					System.out.println("NAME : " + ((Node) nameNode.item(0)).getNodeValue());
					
					NodeList ageNodeList = element.getElementsByTagName("AGE");
					Element age = (Element) ageNodeList.item(0);
					NodeList ageNode = age.getChildNodes();
					System.out.println("AGE : " + ((Node) ageNode.item(0)).getNodeValue());
					
					NodeList courseNodeList = element.getElementsByTagName("COURSE");
					Element course = (Element) courseNodeList.item(0);
					NodeList courseNode = course.getChildNodes();
					System.out.println("COURSE : " + ((Node) courseNode.item(0)).getNodeValue());
					
					NodeList addressNodeList = element.getElementsByTagName("ADDRESS");
					Element address = (Element) addressNodeList.item(0);
					NodeList addressNode = address.getChildNodes();
					System.out.println("ADDRESS : "+((Node) addressNode.item(0)).getNodeValue());
				}

			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

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