Iterate Over XML Nodes with Tree Walker in DOM 2

XML File

Create new package named data. In this package, create new xml file named products.xml as below:

<?xml version="1.0" encoding="UTF-8"?>
<products>
	<product>
		<id>p01</id>
		<name>name 1</name>
		<price currency="usd">20</price>
		<quantity>5</quantity>
		<weight unit="kg">2.1</weight>
		<date format="dd/MM/yyyy">02/03/2017</date>
		<status>true</status>
	</product>
	<product>
		<id>p02</id>
		<name>name 2</name>
		<price currency="eur">12</price>
		<quantity>3</quantity>
		<weight unit="kg">6.5</weight>
		<date format="dd/MM/yyyy">24/11/2018</date>
		<status>true</status>
	</product>
	<product>
		<id>p03</id>
		<name>name 3</name>
		<price currency="aud">13</price>
		<quantity>1</quantity>
		<weight unit="kg">7.8</weight>
		<date format="dd/MM/yyyy">14/10/2018</date>
		<status>false</status>
	</product>
</products>

Run Application

Create new package, named demo. In this package, create new java class, named Main as below

package demo;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.DocumentTraversal;
import org.w3c.dom.traversal.NodeFilter;
import org.w3c.dom.traversal.TreeWalker;

public class Main {

	private static void display() {
		try {
			DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
			DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
			DOMImplementation domImplementation = documentBuilder.getDOMImplementation();
			if (!domImplementation.hasFeature("traversal", "2.0")) {
				System.out.println("A DOM implementation that supports traversal is required.");
				return;
			}
			Document document = documentBuilder.parse("src\\data\\products.xml");
			DocumentTraversal documentTraversal = (DocumentTraversal) document;
			TreeWalker treeWalker = documentTraversal.createTreeWalker(document.getDocumentElement(), NodeFilter.SHOW_ELEMENT, null, true);
			traverseNodes(treeWalker);
		} catch (Exception ex) {
		}
	}

	private static void traverseNodes(TreeWalker treeWalker) {
		Node node = treeWalker.getCurrentNode();

		if (node.getNodeName().equalsIgnoreCase("id")) {
			System.out.println("Id : " + node.getTextContent());
		}
		if (node.getNodeName().equalsIgnoreCase("name")) {
			System.out.println("Name : " + node.getTextContent());
		}
		if (node.getNodeName().equalsIgnoreCase("price")) {
			System.out.println("Price : " + node.getTextContent());
		}
		if (node.getNodeName().equalsIgnoreCase("quantity")) {
			System.out.println("Quantity : " + node.getTextContent());
		}
		if (node.getNodeName().equalsIgnoreCase("weight")) {
			System.out.println("Weight : " + node.getTextContent());
		}
		if (node.getNodeName().equalsIgnoreCase("date")) {
			System.out.println("Date : " + node.getTextContent());
		}
		if (node.getNodeName().equalsIgnoreCase("status")) {
			System.out.println("Status : " + node.getTextContent());
		}

		if (node.hasAttributes()) {
			System.out.println("\tAttributes: " + node.getAttributes().getLength());
			NamedNodeMap namedNodeMap = node.getAttributes();
			for (int i = 0; i < namedNodeMap.getLength(); i++) {
				System.out.println("\t" + namedNodeMap.item(i).getNodeName() + ":" + namedNodeMap.item(i).getTextContent());
			}
		}

		for (Node n = treeWalker.firstChild(); n != null; n = treeWalker.nextSibling()) {
			traverseNodes(treeWalker);
		}
		treeWalker.setCurrentNode(node);
	}

	public static void main(String[] args) {

		display();

	}

}

Output

Id : p01
Name : name 1
Price : 20
	Attributes: 1
	currency:usd
Quantity : 5
Weight : 2.1
	Attributes: 1
	unit:kg
Date : 02/03/2017
	Attributes: 1
	format:dd/MM/yyyy
Status : true
Id : p02
Name : name 2
Price : 12
	Attributes: 1
	currency:eur
Quantity : 3
Weight : 6.5
	Attributes: 1
	unit:kg
Date : 24/11/2018
	Attributes: 1
	format:dd/MM/yyyy
Status : true
Id : p03
Name : name 3
Price : 13
	Attributes: 1
	currency:aud
Quantity : 1
Weight : 7.8
	Attributes: 1
	unit:kg
Date : 14/10/2018
	Attributes: 1
	format:dd/MM/yyyy
Status : false