Java HTML / XML How to - Filter to select nodes from DOM Document


We would like to know how to filter to select nodes from DOM Document.


   //from   w w  w . j a v a2 s  .  c  o  m

import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.DocumentTraversal;
import org.w3c.dom.traversal.NodeFilter;
import org.w3c.dom.traversal.NodeIterator;
import org.xml.sax.InputSource;

public class Main {
  public static String getXMLData() {
    return "<a><person  number='' dept=''><name>myName</name></person></a>";

  public static void main(String[] argv) throws Exception {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    Document document = factory.newDocumentBuilder().parse(
        new InputSource(new StringReader(getXMLData())));

    DocumentTraversal traversal = (DocumentTraversal) document;

    NodeIterator iterator = traversal.createNodeIterator(document.getDocumentElement(),
        NodeFilter.SHOW_ALL, new ItemFilter(), true);

    for (Node n = iterator.nextNode(); n != null; n = iterator.nextNode()) {
      System.out.println("Element: " + ((Element) n).getTagName());

  private static final class ItemFilter implements NodeFilter {
    public short acceptNode(Node n) {
      if (n instanceof Element) {
        if (((Element) n).getTagName().equals("name")) {
          return NodeFilter.FILTER_ACCEPT;
      return NodeFilter.FILTER_REJECT;


The code above generates the following result.