parse xml with dom api

/*
 * Copyright@ 2011 www.egtry.com
 */

package egtry.xml;


import java.io.ByteArrayInputStream;
import java.io.InputStream;

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

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



public class DomReader {

  public static void main(String[] args) throws Exception {
	  //step 1. create DocumentBuilder
	  DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
	  DocumentBuilder domBuilder=factory.newDocumentBuilder();
	  
	  //step 2. build up xml document from InputStream
	  String xml="<root><a n=\"1\"></a></root>";
	  InputStream in=new ByteArrayInputStream(xml.getBytes());
	  Document doc=domBuilder.parse(in);

	  Node docNode=(Node)doc;
	  printNode(docNode);
	  

  }
  
  public static void printNode(Node node) {
	  //node and its attributes
	  String name=node.getNodeName();
	  System.out.print("<"+name);
	  if (node.hasAttributes()) {
		  NamedNodeMap attributes=node.getAttributes();
		  for(int i=0; i<attributes.getLength(); i++) {
			  Node attribute=attributes.item(i);
			  System.out.print(" "+attribute.getNodeName()+"=\""+attribute.getNodeValue()+"\"");
		  }
		  
	  }
	  System.out.println(">");
	  
	  //get child nodes
	  NodeList childList=node.getChildNodes();
	  for(int i=0; i<childList.getLength(); i++ ) {
		  Node child=childList.item(i);
		  printNode(child);
	  }
	  
	  
	  System.out.println("</"+name+">");
	  
  }
}

<#document>
<root>
<a n="1">
</a>
</root>
</#document>