Re: get a xml node as-it-is

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <>
Fri, 18 Jan 2008 23:42:15 -0500
ArunDhaJ wrote:

i hve a xml like this:
  <Student name = "arun1" number="6">
  <Student name = "arun2" number="7">
  <Student name = "arun3" number="8">
  <Student name = "arun4" number="9">

i need to build a new xml or a string from this with few student
nodes.... some thing like this..

  <Student name = "arun2" number="7">
  <Student name = "arun3" number="8">

by selecting only the two nodes.........

is there any api which should return some thing like this
"<Student name = "arun2" number="7">"

It can be done in many different ways: getElementsByTagName,
XPath etc., but just for the fun of it I tried using one
of the less known features of W3C DOM - the Walker. See code




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

import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
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 Selection {
     public static void main(String[] args) throws Exception {
         DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
         DocumentBuilder db = dbf.newDocumentBuilder();
         Document doc = db.parse(new File("C:\\stud.xml"));
         Document newdoc = db.newDocument();
         TreeWalker walk =
NodeFilter.SHOW_ELEMENT, new Filter(), false);
         Node n;
         while((n = walk.nextNode()) != null) {
newdoc.getDocumentElement().appendChild(newdoc.importNode(n, true));
         OutputFormat fmt = new OutputFormat();
         XMLSerializer ser = new XMLSerializer(new
FileOutputStream("C:\\stud2.xml"), fmt);

class Filter implements NodeFilter {
     public short acceptNode(Node n) {
         if(n.getNodeName().equals("Student")) {
             int num =
             if(num >= 7 && num <= 8) {
                return NodeFilter.FILTER_ACCEPT;
             } else {
                 return NodeFilter.FILTER_REJECT;
         } else {
             return NodeFilter.FILTER_REJECT;

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