Remove white space nodes from jtree

Question

I am trying to create jtree using XML DOM.
But I m not able to remove/ignore the white space elements from DOM.
I am getting output something like this
for example
Server
Text
node1
Text
I want something like this.
Server
node1
I tried all option for removeing the white space
Here I am posting the source
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import java.io.File;
import java.io.IOException;
import org.w3c.dom.Document;
import org.w3c.dom.DOMException;
// Basic GUI components
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
// GUI components for right-hand side
import javax.swing.JSplitPane;
import javax.swing.JEditorPane;
// GUI support classes
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
// For creating borders
import javax.swing.border.EmptyBorder;
import javax.swing.border.BevelBorder;
import javax.swing.border.CompoundBorder;
// For creating a TreeModel
import javax.swing.tree.*;
import javax.swing.event.*;
import java.util.*;
public class DomEcho02 extends JPanel
// Global value so it can be ref'd by the tree-adapter
static Document document;
static final int windowHeight = 460;
static final int leftWidth = 300;
static final int rightWidth = 340;
static final int windowWidth = leftWidth + rightWidth;
public DomEcho02()
// Make a nice border
EmptyBorder eb = new EmptyBorder(5,5,5,5);
BevelBorder bb = new BevelBorder(BevelBorder.LOWERED);
CompoundBorder cb = new CompoundBorder(eb,bb);
this.setBorder(new CompoundBorder(cb,eb));
// Set up the tree
JTree tree = new JTree(new DomToTreeModelAdapter());
// Iterate over the tree and make nodes visible
// (Otherwise, the tree shows up fully collapsed)
//TreePath nodePath = ???;
// tree.expandPath(nodePath);
// Build left-side view
JScrollPane treeView = new JScrollPane(tree);
treeView.setPreferredSize(
new Dimension( leftWidth, windowHeight ));
// Build right-side view
JEditorPane htmlPane = new JEditorPane("text/html","");
htmlPane.setEditable(false);
JScrollPane htmlView = new JScrollPane(htmlPane);
htmlView.setPreferredSize(
new Dimension( rightWidth, windowHeight ));
// Build split-pane view
JSplitPane splitPane =
new JSplitPane( JSplitPane.HORIZONTAL_SPLIT,
treeView,
htmlView );
splitPane.setContinuousLayout( true );
splitPane.setDividerLocation( leftWidth );
splitPane.setPreferredSize(
new Dimension( windowWidth + 10, windowHeight+10 ));
// Add GUI components
this.setLayout(new BorderLayout());
this.add("Center", splitPane );
} // constructor
public static void main(String argv[])
if (argv.length != 1) {
System.err.println("Usage: java DomEcho filename");
System.exit(1);
DocumentBuilderFactory factory =
DocumentBuilderFactory.newInstance();
//factory.setValidating(true);
//factory.setNamespaceAware(true);
try {
DocumentBuilder builder = factory.newDocumentBuilder();
document = builder.parse( new File(argv[0]) );
makeFrame();
} catch (SAXException sxe) {
// Error generated during parsing)
Exception x = sxe;
if (sxe.getException() != null)
x = sxe.getException();
x.printStackTrace();
} catch (ParserConfigurationException pce) {
// Parser with specified options can't be built
pce.printStackTrace();
} catch (IOException ioe) {
// I/O error
ioe.printStackTrace();
} // main
public static void makeFrame() {
// Set up a GUI framework
JFrame frame = new JFrame("DOM Echo");
frame.addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
// Set up the tree, the views, and display it all
final DomEcho02 echoPanel =
new DomEcho02();
frame.getContentPane().add("Center", echoPanel );
frame.pack();
Dimension screenSize =
Toolkit.getDefaultToolkit().getScreenSize();
int w = windowWidth + 10;
int h = windowHeight + 10;
frame.setLocation(screenSize.width/3 - w/2,
screenSize.height/2 - h/2);
frame.setSize(w, h);
frame.setVisible(true);
} // makeFrame
// An array of names for DOM node-types
// (Array indexes = nodeType() values.)
static final String[] typeName = {
"none",
"Element",
"Attr",
"Text",
"CDATA",
"EntityRef",
"Entity",
"ProcInstr",
"Comment",
"Document",
"DocType",
"DocFragment",
"Notation",
// This class wraps a DOM node and returns the text we want to
// display in the tree. It also returns children, index values,
// and child counts.
public class AdapterNode
org.w3c.dom.Node domNode;
// Construct an Adapter node from a DOM node
public AdapterNode(org.w3c.dom.Node node) {
domNode = node;
// Return a string that identifies this node in the tree
// *** Refer to table at top of org.w3c.dom.Node ***
public String toString() {
String s = typeName[domNode.getNodeType()];
String nodeName = domNode.getNodeName();
if (! nodeName.startsWith("#")) {
s += ": " + nodeName;
if (domNode.getNodeValue() != null) {
if (s.startsWith("ProcInstr"))
s += ", ";
else
s += ": ";
// Trim the value to get rid of NL's at the front
String t = domNode.getNodeValue().trim();
int x = t.indexOf("\n");
if (x >= 0) t = t.substring(0, x);
s += t;
return s;
* Return children, index, and count values
public int index(AdapterNode child) {
//System.err.println("Looking for index of " + child);
int count = childCount();
for (int i=0; i<count; i++) {
AdapterNode n = this.child(i);
if (child.domNode == n.domNode) return i;
return -1; // Should never get here.
public AdapterNode child(int searchIndex) {
//Note: JTree index is zero-based.
org.w3c.dom.Node node =
domNode.getChildNodes().item(searchIndex);
return new AdapterNode(node);
public int childCount() {
return domNode.getChildNodes().getLength();
// This adapter converts the current Document (a DOM) into
// a JTree model.
public class DomToTreeModelAdapter
implements javax.swing.tree.TreeModel
// Basic TreeModel operations
public Object getRoot() {
//System.err.println("Returning root: " +document);
return new AdapterNode(document);
public boolean isLeaf(Object aNode) {
// Determines whether the icon shows up to the left.
// Return true for any node with no children
AdapterNode node = (AdapterNode) aNode;
if (node.childCount() > 0) return false;
return true;
public int getChildCount(Object parent) {
AdapterNode node = (AdapterNode) parent;
return node.childCount();
public Object getChild(Object parent, int index) {
AdapterNode node = (AdapterNode) parent;
return node.child(index);
public int getIndexOfChild(Object parent, Object child) {
AdapterNode node = (AdapterNode) parent;
return node.index((AdapterNode) child);
public void valueForPathChanged(TreePath path, Object newValue) {
// Null. We won't be making changes in the GUI
// If we did, we would ensure the new value was really new,
// adjust the model, and then fire a TreeNodesChanged event.
* Use these methods to add and remove event listeners.
* (Needed to satisfy TreeModel interface, but not used.)
private Vector listenerList = new Vector();
public void addTreeModelListener(TreeModelListener listener) {
if ( listener != null
&& ! listenerList.contains( listener ) ) {
listenerList.addElement( listener );
public void removeTreeModelListener(TreeModelListener listener) {
if ( listener != null ) {
listenerList.removeElement( listener );
// Note: Since XML works with 1.1, this example uses Vector.
// If coding for 1.2 or later, though, I'd use this instead:
// private List listenerList = new LinkedList();
// The operations on the List are then add(), remove() and
// iteration, via:
// Iterator it = listenerList.iterator();
// while ( it.hasNext() ) {
// TreeModelListener listener = (TreeModelListener) it.next();
* Invoke these methods to inform listeners of changes.
* (Not needed for this example.)
* Methods taken from TreeModelSupport class described at
* http://java.sun.com/products/jfc/tsc/articles/jtree/index.html
* That architecture (produced by Tom Santos and Steve Wilson)
* is more elegant. I just hacked 'em in here so they are
* immediately at hand.
public void fireTreeNodesChanged( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesChanged( e );
public void fireTreeNodesInserted( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesInserted( e );
public void fireTreeNodesRemoved( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesRemoved( e );
public void fireTreeStructureChanged( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeStructureChanged( e );
}

Answer 1

DocumentBuilderFactory can be configured to ignore white space.
http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/parsers/DocumentBuilderFactory.html#setIgnoringElementContentWhitespace(boolean)