JTree & TreeModel
Hi,
I have created a TreeModel with my own unique object array.
When i get a path component on the tree, it returns one of my unique objects.
So they are not of type MutableTreeNode.
That's all great!
Now, if i want to add or remove a node on the tree what is the approach i should use?
I am thinking i should find the parent in my array, update it's children and tell the tree that it needs to update itself.
Is this correct?
Any pointers would be of great benefit.
Thanks,
Dave
I don't know what you need to do for your objects. With regard to your original post -- which I interpreted as asking how to get the view changed to reflect changes in the model -- the fact is that the JTree will attach itself as a listener to your tree model, so if the tree model needs to tell the JTree about some change in the model's tree structure, then the obvious way to do that is to send the appropriate messages to that listener.
I also don't have any recommendations about how you should maintain your model, except to say that when you change something in your model, you do need to notify all its listeners that you made that change.
Similar Messages
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JTree (TreeModel) vs (TreeNode)
hellow,
I've got some troubles with a tree-view of my data model: I've created my own TreeModel, implemented the necessary methods, ...
Now, when I try to display the JTree with the TreeNode parameter (I parse the whole data tree) it works perfectly, but when I'm trying the TreeModel parameter, it only shows the root node (I tried "treeStructureChanged (event)" without result).
Does someone know what I might be forgetting ?
Can I add a treenodes manually (might give me a clue what I'm doing wrong in my implementation) ?
thx alot,
Jerrypublic class X
static public TreeNode parseDataModel () { ... }
// parseDataModel() returns the tree root node.
tree = new JTree(parseDataModel());
treeView = new JScrollPane(tree);
frame.getContentPane().add(treeView, BorderLayout.WEST);
=> this works fine
public class MyTreeModel implements TreeModel { ... }
MyTreeModel mtm = new MyTreeModel();
JTree jTree = new JTree (mtm);
treeView = new JScrollPane(jTree);
frame.getContentPane().add(treeView, BorderLayout.WEST);
=> only shows the root node (double-clicking it has no effect; it has no 'folder' icon) -
Refreshing JTree with a customized TreeModel
Hello,
I'm newer to Swing, and I'm seeking for help for a JTree problem.
I hoped to display an XML document with JTree. So I customized a TreeModel and TreeNode to handle the XML data.
I used DOM to handle XML, and define TreeNode with the following class:
class DOMtoTreeNode {
org.w3c.dom.Node domNode;
public DOMtoTreeNode(org.w3c.dom.Node myNode){
this.domNode = myNOde; }
public String toString() {
//the displaying code
//and other necessary code to handle children of domNode
Then I defined an implementation of the TreeModel Interface.
public class DomTreeModel implements javax.swing.tree.TreeModel
Document document;
public DomTreeModel(Document aDomDoc){
this.document = aDomDoc;
// Basic TreeModel operations
I didn't define any personal TreeModelListener for this TreeModel
and then I created a JTree object to display the XML tree
treeModel = new DomTreeModel(someDOMDocument);
treeInputParameter = new JTree( treeModel );
and I defined JtreeListener.
What I hoped to do is to make modification for the XML document in the JTree.
I added the editing functions in the "valueChanged" function. I added a new DOM node as a child of an existing element node by directly append the child in the DOM node. The code is like the follows:
DOMToTreeNode treeNodeSelected =(DOMToTreeNode)
treeInputParameter.getLastSelectedPathComponent();
org.w3c.dom.Node domNode = treeNodeSelected.getNode();
//get the dom node from Jtree Node here
domNode.appendChild(someChildDomNode);
Up to now, it seems work fine. The TreeModel updates the DOM Document, and the modification being shown in JTree.
But when I tried to replace an existing node with a new node, something went wrong.
domNode.replace(newChild, oldChild);
I debugged the code, and found the underlying DOM Document in the TreeModel had been successfully changed, but the TreeModel didn't update the display in JTree.
I'm afraid this is quite a naive question, but would someone be kindly help me deal with this? It seems that the reason is that some code is missing to let the TreeModel refresh the frontend JTree display. But I realy don't know how to tackle this.
Thanks!
Haoxiang XiaThank you for your reply.
Are you adding nodes or just expanding the JTree?Adding nodes (I also want to delete nodes)
I don't know how to do this by just implementing
TreeModel. This is using DefaultTreeModel.Yeah, I really don't want to use DefaultTreeModel because I would have to wrap my data objects as TreeNodes. Since my data objects are already in a tree structure, implementing TreeModel is much cleaner.
It looks like I have to implement fireTreeNodesInserted() in my TreeModel, but I guess what I need to understand is how to register the JTree as a listener to my custom TreeModel. JTree doesn't directly implement TreeModelListener. I read somewhere that JTree automatically registers itself with the TreeModel, but that is not what I am observing.
So..., I am still in need of more info. -
Need help with updateing a JTree
I have a JList, and JTree which mimic each other. User makes selection in list presses OK and in the JTree I need the node that matches their selection to update and have child nodes under it. Can't seem to get it working right.
right now I have this:
Logic Trail
item one
item two
item three
item four
after update I need this
Logic Trail
item one
testing
item two
item three
item four
// in the GUI
// pass the selected int to the method in class TreePanel
treePanel.updateTree( questionList.getSelectedIndex());
// here is the TreePanel class
import java.awt.*;
import javax.swing.*;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
public class TreePanel extends javax.swing.JPanel {
private String[] questions;
DefaultTreeModel treeModel;
DefaultMutableTreeNode root;
public TreePanel(String[] questions) {
this.questions = questions;
root = new DefaultMutableTreeNode("Logic Trail");
treeModel = new DefaultTreeModel(root);
initComponents ();
private void initComponents () {
jScrollPane1 = new javax.swing.JScrollPane ();
logicTree = new JTree(treeModel);
setLayout (new java.awt.BorderLayout ());
jScrollPane1.setViewportView (logicTree);
add (jScrollPane1, java.awt.BorderLayout.CENTER);
// method to update JTree, when user selects accept tree will update with new logic path
public void updateTree(int selectedNode){
DefaultMutableTreeNode newNode = new DefaultMutableTreeNode( treeModel.getChild(root, selectedNode));
logicTree.setSelectionRow(selectedNode);
DefaultMutableTreeNode logicNode = new DefaultMutableTreeNode( logicTree.getSelectionPath() );
DefaultMutableTreeNode testNode = new DefaultMutableTreeNode(" testing" );
treeModel.insertNodeInto(testNode, logicNode, 0);
treeModel.reload();
public void createTree(){
for( int i = 0; i < questions.length; i++ ){
DefaultMutableTreeNode questionNode = new DefaultMutableTreeNode( questions[i] );
treeModel.insertNodeInto(questionNode, root, i );
treeModel.reload();
// Variables declaration - do not modify
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTree logicTree;
// End of variables declaration
}Thanks for nothing
-
How to cut, copy and paste a tree node in JTree?????
Hi, Java GUI guru. Thank you for your help in advance.
I am working on a File Explorer project with JTree. There are cut, copy and paste item menus in my menu bar. I need three EventAction methods or classes to implements the three tasks. I tried to use Clipboard to copy and paste tree node. But I can not copy any tree node from my tree.
Are there any body has sample source code about cut, copy, and paste for tree? If possible, would you mind send me your sample source code to [email protected]
I would appreciate you very very much for your help!!!!
X.G.Hi, Paul Clapham:
Thank you for your quick answer.
I store the node in a DefaultMutableTreeNode variable, and assign it to another DefaultMutableTreeNode variable. I set up two classes (CopyNode and PasteNode). Here they are as follows:
//CopyNode class
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class CopyNode implements ActionListener{
private TreeList jtree;
String treeNodeName;
TreePath currentSelection;
DefaultMutableTreeNode currentNode;
public CopyNode(TreeList t){
jtree = t;
public void actionPerformed(ActionEvent e){
currentSelection = jtree.tree.getSelectionPath();
if(currentSelection != null){
currentNode = (DefaultMutableTreeNode)(currentSelection.getLastPathComponent());
treeNodeName = currentNode.toString();
//PasteNode class
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class PasteNode extends DefaultMutableTreeNode{
private TreeList jtree;
CopyNode copyNode;
public PasteNode(TreeList t){
jtree = t;
copyNode = new CopyNode(t);
public DefaultMutableTreeNode addObject(Object child){
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = jtree.tree.getSelectionPath();
if(parentPath == null){
parentNode = jtree.root;
else{
parentNode = (DefaultMutableTreeNode)parentPath.getLastPathComponent();
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent, Object child, boolean shouldBeVisible){
DefaultMutableTreeNode childNode = copyNode.currentNode;
if(parent == null){
parent = jtree.root;
jtree.treemodel.insertNodeInto(childNode, parent, parent.getChildCount());
if(shouldBeVisible){
jtree.tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
I used these two classes objects in "actionPerformed(ActionEvent e)" methods in my tree:
//invoke copyNode
copyItem = new JMenuItem("Copy");
copyItem.addActionListener(copyNode);
//invoke pasteNode
pasteItem = new JMenuItem("Paste");
pasteItem.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
pasteName.addObject(copyName.treeNodeName);
When I run the drive code, making a copy some node from my tree list, I got bunch of error messages.
Can you figour out what is wrong in my two classes? If you have sample code, would you mind mail me for reference.
Thank you very much in advance.
X.G. -
Hi,
I'm writing a simple Swing program to examine the entries in a JAR file as a JTree. It is not meant to be professional grade, it's simply for my own fun.
I have the program so that it displays a Window with a Menus. When the user chooses a JAR file, the program opens the JAR file, reads the entries in the file, and builds a DefaultTreeModel for the entries in the JAR file. Then, it builds a JTree from the DefaultTreeModel.
The program works great, except, once the tree is created, I don't know how to force Swing to redraw the JFrame.
Can someone please tell me what I'm doing wrong?
The code is as follows:
<pre>
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.io.*;
import java.util.jar.*;
import java.util.*;
* <p>This class is used to display the contents of a JAR file.
* The entries of the JAR file will be displayed in Swing Tree.
* @version 1.0
* @author Kevin Yetman
public class JarFileTree
* <p>This method is used to display the GUI.
public static void main(String[] args)
{ JFrame frame=new JarTreeFrame();
frame.show();
* <p>This class is used to define the javax.swing.JFrame based object that
* will contain the tree from the JAR file.
class JarTreeFrame extends JFrame implements ActionListener
private JTree tree;
private DefaultTreeModel treeModel;
private DefaultMutableTreeNode root;
private JScrollPane scrollPane;
* <P>This constructor is used create and display the frame.
public JarTreeFrame()
{ setTitle("JAR Viewer");
setSize(800, 600);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
JMenuBar menuBar=setupMenuBar();
setJMenuBar(menuBar);
root = new DefaultMutableTreeNode("No file selected yet.");
treeModel=new DefaultTreeModel(root);
tree = new JTree(treeModel);
scrollPane=new JScrollPane(tree);
Container contentPane=getContentPane();
contentPane.add(scrollPane);
public void processString(String currentEntry, DefaultMutableTreeNode currentNode, DefaultTreeModel treeModel)
if( currentEntry.length()==0 )
{ return;
int slashPos=currentEntry.indexOf('/');
String currentToken="";
String remainingPartOfCurrentEntry="";
if( slashPos!=-1 )
{ currentToken=currentEntry.substring(0, slashPos);
remainingPartOfCurrentEntry=currentEntry.substring(slashPos+1, currentEntry.length());
else
{ currentToken=currentEntry;
boolean childFound=false;
for(Enumeration e=currentNode.children(); e.hasMoreElements(); )
DefaultMutableTreeNode currentChild=(DefaultMutableTreeNode)e.nextElement();
if( currentChild.toString().equals(currentToken) )
processString(remainingPartOfCurrentEntry, currentChild, treeModel);
childFound=true;
if( !childFound )
DefaultMutableTreeNode newChild=new DefaultMutableTreeNode(currentToken);
treeModel.insertNodeInto(newChild, currentNode, currentNode.getChildCount());
protected JMenuBar setupMenuBar()
JMenuBar menuBar=new JMenuBar();
JMenu helpMenu =new JMenu("Help");
JMenuItem aboutItem=new JMenuItem("About");
aboutItem.setActionCommand("HelpAbout");
aboutItem.addActionListener(this);
helpMenu.add(aboutItem);
JMenu fileMenu = new JMenu("File");
JMenuItem openItem=new JMenuItem("Open");
openItem.setActionCommand("FileOpen");
openItem.addActionListener(this);
JMenuItem exitItem=new JMenuItem("Exit");
exitItem.addActionListener( new ActionListener()
{ public void actionPerformed(ActionEvent evt)
{ System.exit(0);
fileMenu.add(openItem);
fileMenu.add(exitItem);
menuBar.add(fileMenu);
menuBar.add(helpMenu);
return menuBar;
public void setupTree(String fileName)
try
JarFile jarFile=new JarFile(new File(fileName));
for(Enumeration e=jarFile.entries(); e.hasMoreElements(); )
String currentEntry=(e.nextElement().toString()).trim();
processString(currentEntry, root, treeModel);
DefaultMutableTreeNode lastLeaf=root.getLastLeaf();
TreePath path=new TreePath(treeModel.getPathToRoot(lastLeaf));
tree.makeVisible(path);
catch(IOException e)
{ JOptionPane.showMessageDialog(this, "ERROR: " + e.toString());
public void actionPerformed(ActionEvent evt)
if(evt.getActionCommand().equals("FileOpen"))
FileOpenSaveAs fosa=new FileOpenSaveAs(this, true);
if(fosa.approveOptionClicked())
String fileName=fosa.getSelectedFile();
fileName+=".jar";
setupTree(fileName);
Container contentPane=getContentPane();
contentPane.removeAll();
contentPane.add(new JScrollPane(tree));
contentPane.repaint();
if(evt.getActionCommand().equals("HelpAbout"))
{ JOptionPane.showMessageDialog(this, "JAR Viewer Version 1.0\nKevin Yetman");
// FileOpenSaveAs.java
// Author: Kevin Yetman
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.event.*;
// this class handles the display of the
// File Open or File Save As box.
public class FileOpenSaveAs {
// the constructor takes one argument, a
// boolean which if true opens the File Open
// box. If false it opens the save as box.
public FileOpenSaveAs(JFrame baseWindow, boolean fileOpenBox) {
// initailze the result varialbe
result=-1;
// store the value of the fileOpenBox.
openBox=fileOpenBox;
// initialize the fileNameSelected string.
fileNameSelected=new String();
// first build a JFileChooser.
JFileChooser fc=new JFileChooser();
// next tell the file chooser to look in the
// current directory.
fc.setCurrentDirectory(new File(CURRENT_DIRECTORY));
// if the file open box is true, display the file open box.
// otherwise, display the file save as box.
if( fileOpenBox ) {
fc.setDialogTitle(OPEN_TITLE);
displayBox(baseWindow, fc);
else {
fc.setDialogTitle(SAVE_AS_TITLE);
displayBox(baseWindow, fc);
// the constructor takes one argument, a
// boolean which if true opens the File Open
// box. If false it opens the save as box.
public FileOpenSaveAs(JDialog baseWindow, boolean fileOpenBox) {
// initailze the result varialbe
result=-1;
// store the value of the fileOpenBox.
openBox=fileOpenBox;
// initialize the fileNameSelected string.
fileNameSelected=new String();
// first build a JFileChooser.
JFileChooser fc=new JFileChooser();
// next tell the file chooser to look in the
// current directory.
fc.setCurrentDirectory(new File(CURRENT_DIRECTORY));
// if the file open box is true, display the file open box.
// otherwise, display the file save as box.
if( fileOpenBox ) {
fc.setDialogTitle(OPEN_TITLE);
displayBox(baseWindow, fc);
else {
fc.setDialogTitle(SAVE_AS_TITLE);
displayBox(baseWindow, fc);
// this method displays the File Open box on the base window.
public void displayBox(JFrame baseWindow, JFileChooser fc) {
// display the file open box and get the result.
result=-1;
if( openBox==true ) {
result=fc.showOpenDialog(baseWindow);
else {
result=fc.showSaveDialog(baseWindow);
// get the file name.
if( approveOptionClicked() ) {
fileNameSelected=fc.getName(fc.getSelectedFile());
else {
fileNameSelected="";
// this method displays the File Open box on the base window.
public void displayBox(JDialog baseWindow, JFileChooser fc) {
// display the file open box and get the result.
result=-1;
if( openBox==true ) {
result=fc.showOpenDialog(baseWindow);
else {
result=fc.showSaveDialog(baseWindow);
// get the file name.
if( approveOptionClicked() ) {
fileNameSelected=fc.getName(fc.getSelectedFile());
else {
fileNameSelected="";
// check to see if the result is APPROVE_OPTION. If so, we
// will return true.
public boolean approveOptionClicked() {
return (result == JFileChooser.APPROVE_OPTION );
// get the file name chosen by the user.
public String getSelectedFile() {
return fileNameSelected;
// private attributes for this class.
private boolean openBox;
private static final String CURRENT_DIRECTORY=".";
private static final String SAVE_AS_TITLE="Save As";
private static final String OPEN_TITLE="Open";
private int result;
private String fileNameSelected;
</pre>
Thanks!
Kevin YetmanWithout looking at all your code, I would suggest that you only redraw the part of the tree that changes (addition or deletion of nodes). To do this, you can call a method of DefaultTreeModel, nodeStructureChanged(TreeNode nodeThatChanged). This fires the appropriate event which in turn causes the node and only its descendents to be redrawn. Good luck.
-Matt -
Help with building a JTree using tree node and node renderers
Hi,
I am having a few problems with JTree's. basically I want to build JTree from a web spider. The webspide searches a website checking links and stores the current url that is being processed as a string in the variable msg. I wan to use this variable to build a JTree in a new class and then add it to my GUI. I have created a tree node class and a renderer node class, these classes are built fine. can someone point me in the direction for actually using these to build my tree in a seperate class and then displaying it in a GUI class?
*nodeRenderer.java
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.net.*;
public class nodeRenderer extends DefaultTreeCellRenderer
implements TreeCellRenderer
public static Icon icon= null;
public nodeRenderer() {
icon = new ImageIcon(getClass().getResource("icon.gif"));
public Component getTreeCellRendererComponent(
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) {
super.getTreeCellRendererComponent(
tree, value, sel,
expanded, leaf, row,
hasFocus);
treeNode node = (treeNode)(((DefaultMutableTreeNode)value).getUserObject());
if(icon != null) // set a custom icon
setOpenIcon(icon);
setClosedIcon(icon);
setLeafIcon(icon);
return this;
*treeNode.java
*this is the class to represent a node
import javax.swing.*;
import javax.swing.tree.*;
import java.util.*;
import java.net.*;
* Class used to hold information about a web site that has
* been searched by the spider class
public class treeNode
*Url from the WebSpiderController Class
*that is currently being processed
public String msg;
treeNode(String urlText)
msg = urlText;
String getUrlText()
return msg;
//gui.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
*declare variable, boolean
*thread, a object and a center
*pane
protected URL urlInput;
protected Thread bgThread;
protected boolean run = false;
protected WebSpider webSpider;
public gui()
*create the gui here
setTitle("Testing Tool");
setSize(600,600);
//add Buttons to the tool bar
start.setText("Start");
start.setActionCommand("Start");
toolBar.add(start);
ButtonListener startListener = new ButtonListener();
start.addActionListener(startListener);
cancel.setText("Cancel");
cancel.setActionCommand("Cancel");
toolBar.add(cancel);
ButtonListener cancelListener = new ButtonListener();
cancel.addActionListener(cancelListener);
close.setText("Close");
close.setActionCommand("Close");
toolBar.add(close);
ButtonListener closeListener = new ButtonListener();
close.addActionListener(closeListener);
//creat a simple form
urlLabel.setText("Enter URL:");
urlLabel.setBounds(100,36,288,24);
formTab.add(urlLabel);
url.setBounds(170,36,288,24);
formTab.add(url);
current.setText("Currently Processing: ");
current.setBounds(100,80,288,24);
formTab.add(current);
//add scroll bars to the error messages screen and website structure
errorPane.setAutoscrolls(true);
errorPane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
errorPane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
errorPane.setOpaque(true);
errorTab.add(errorPane);
errorPane.setBounds(0,0,580,490);
errorText.setEditable(false);
errorPane.getViewport().add(errorText);
errorText.setBounds(0,0,600,550);
treePane.setAutoscrolls(true);
treePane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
treePane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
treePane.setOpaque(true);
treeTab.add(treePane);
treePane.setBounds(0,0,580,490);
treeText.setEditable(false);
treePane.getViewport().add(treeText);
treeText.setBounds(0,0,600,550);
//create the tabbed window
centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
//add the tool bar and tabbed pane
getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
*create the tool bar pane, a center pane, add the buttons,
*labels, tabs, a text field for user input here
javax.swing.JPanel toolBar = new javax.swing.JPanel();
javax.swing.JButton start = new javax.swing.JButton();
javax.swing.JButton cancel = new javax.swing.JButton();
javax.swing.JButton close = new javax.swing.JButton();
javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
javax.swing.JPanel formTab = new javax.swing.JPanel();
javax.swing.JLabel urlLabel = new javax.swing.JLabel();
javax.swing.JLabel current = new javax.swing.JLabel();
javax.swing.JTextField url = new javax.swing.JTextField();
javax.swing.JPanel errorTab = new javax.swing.JPanel();
javax.swing.JTextArea errorText = new javax.swing.JTextArea();
javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
javax.swing.JPanel treeTab = new javax.swing.JPanel();
javax.swing.JTextArea treeText = new javax.swing.JTextArea();
javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
javax.swing.JTree searchTree = new javax.swing.JTree();
*show the gui
public static void main(String args[])
(new gui()).setVisible(true);
*listen for the button presses and set the
*boolean flag depending on which button is pressed
class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
Object object = event.getSource();
if (object == start)
run = true;
startActionPerformed(event);
if (object == cancel)
run = false;
startActionPerformed(event);
if (object == close)
System.exit(0);
*this method is called when the start or
*cancel button is pressed.
void startActionPerformed (ActionEvent event)
if (run == true && bgThread == null)
bgThread = new Thread(this);
bgThread.start();
if (run == false && bgThread != null)
webSpider.cancel();
*this mehtod will start the background thred.
*the background thread is required so that the
*GUI is still displayed
public void run()
try
webSpider = new WebSpider(this);
webSpider.clear();
urlInput = new URL(url.getText());
webSpider.addURL(urlInput);
webSpider.run();
bgThread=null;
catch (MalformedURLException e)
addressError addErr = new addressError();
addErr.addMsg = "URL ERROR - PLEASE CHECK";
SwingUtilities.invokeLater(addErr);
*this method is called by the web spider
*once a url is found. Validation of navigation
*happens here.
public boolean urlFound(URL urlInput,URL url)
CurrentlyProcessing pro = new CurrentlyProcessing();
pro.msg = url.toString();
SwingUtilities.invokeLater(pro);
if (!testLink(url))
navigationError navErr = new navigationError();
navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
return false;
if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
return false;
else
return true;
*this method is called internally to check
*that a link works
protected boolean testLink(URL url)
try
URLConnection connection = url.openConnection();
connection.connect();
return true;
catch (IOException e)
return false;
*this method is called when an error is
*found.
public void URLError(URL url)
*this method is called when an email
*address is found
public void emailFound(String email)
/*this method will update any errors found inc
*address errors and broken links
class addressError implements Runnable
public String addMsg;
public void run()
errorText.append(addMsg);
current.setText("Currently Processing: "+ addMsg);
class navigationError implements Runnable
public String navMsg;
public void run()
errorText.append(navMsg);
*this method will update the currently
*processing field on the GUI
class CurrentlyProcessing implements Runnable
public String msg;
public void run()
current.setText("Currently Processing: " + msg );
//webspider.java
import java.util.*;
import java.net.*;
import java.io.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.tree.*;
import javax.swing.*;
*this class implements the spider.
public class WebSpider extends HTMLEditorKit
*make a collection of the URL's
protected Collection urlErrors = new ArrayList(3);
protected Collection urlsWaiting = new ArrayList(3);
protected Collection urlsProcessed = new ArrayList(3);
//report URL's to this class
protected gui report;
*this flag will indicate whether the process
*is to be cancelled
protected boolean cancel = false;
*The constructor
*report the urls to the wui class
public WebSpider(gui report)
this.report = report;
*get the urls from the above declared
*collections
public Collection getUrlErrors()
return urlErrors;
public Collection getUrlsWaiting()
return urlsWaiting;
public Collection getUrlsProcessed()
return urlsProcessed;
* Clear all of the collections.
public void clear()
getUrlErrors().clear();
getUrlsWaiting().clear();
getUrlsProcessed().clear();
*Set a flag that will cause the begin
*method to return before it is done.
public void cancel()
cancel = true;
*add the entered url for porcessing
public void addURL(URL url)
if (getUrlsWaiting().contains(url))
return;
if (getUrlErrors().contains(url))
return;
if (getUrlsProcessed().contains(url))
return;
/*WRITE TO LOG FILE*/
log("Adding to workload: " + url );
getUrlsWaiting().add(url);
*process a url
public void processURL(URL url)
try
/*WRITE TO LOGFILE*/
log("Processing: " + url );
// get the URL's contents
URLConnection connection = url.openConnection();
if ((connection.getContentType()!=null) &&
!connection.getContentType().toLowerCase().startsWith("text/"))
getUrlsWaiting().remove(url);
getUrlsProcessed().add(url);
log("Not processing because content type is: " +
connection.getContentType() );
return;
// read the URL
InputStream is = connection.getInputStream();
Reader r = new InputStreamReader(is);
// parse the URL
HTMLEditorKit.Parser parse = new HTMLParse().getParser();
parse.parse(r,new Parser(url),true);
catch (IOException e)
getUrlsWaiting().remove(url);
getUrlErrors().add(url);
log("Error: " + url );
report.URLError(url);
return;
// mark URL as complete
getUrlsWaiting().remove(url);
getUrlsProcessed().add(url);
log("Complete: " + url );
*start the spider
public void run()
cancel = false;
while (!getUrlsWaiting().isEmpty() && !cancel)
Object list[] = getUrlsWaiting().toArray();
for (int i=0;(i<list.length)&&!cancel;i++)
processURL((URL)list);
* A HTML parser callback used by this class to detect links
protected class Parser extends HTMLEditorKit.ParserCallback
protected URL urlInput;
public Parser(URL urlInput)
this.urlInput = urlInput;
public void handleSimpleTag(HTML.Tag t,MutableAttributeSet a,int pos)
String href = (String)a.getAttribute(HTML.Attribute.HREF);
if((href==null) && (t==HTML.Tag.FRAME))
href = (String)a.getAttribute(HTML.Attribute.SRC);
if (href==null)
return;
int i = href.indexOf('#');
if (i!=-1)
href = href.substring(0,i);
if (href.toLowerCase().startsWith("mailto:"))
report.emailFound(href);
return;
handleLink(urlInput,href);
public void handleStartTag(HTML.Tag t,MutableAttributeSet a,int pos)
handleSimpleTag(t,a,pos); // handle the same way
protected void handleLink(URL urlInput,String str)
try
URL url = new URL(urlInput,str);
if (report.urlFound(urlInput,url))
addURL(url);
catch (MalformedURLException e)
log("Found malformed URL: " + str);
*log the information of the spider
public void log(String entry)
System.out.println( (new Date()) + ":" + entry );
I have a seperate class for parseing the HTML. Any help would be greatly appreciated
mrvHi Sorry to be a pain again,
I have re worked the gui class so it looks like this now:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
*declare variable, boolean
*thread, a object and a center
*pane
protected URL urlInput;
protected Thread bgThread;
protected boolean run = false;
protected WebSpider webSpider;
public String msgInfo;
public String brokenUrl;
public String goodUrl;
public String deadUrl;
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
public gui()
*create the gui here
setTitle("Testing Tool");
setSize(600,600);
//add Buttons to the tool bar
start.setText("Start");
start.setActionCommand("Start");
toolBar.add(start);
ButtonListener startListener = new ButtonListener();
start.addActionListener(startListener);
cancel.setText("Cancel");
cancel.setActionCommand("Cancel");
toolBar.add(cancel);
ButtonListener cancelListener = new ButtonListener();
cancel.addActionListener(cancelListener);
close.setText("Close");
close.setActionCommand("Close");
toolBar.add(close);
ButtonListener closeListener = new ButtonListener();
close.addActionListener(closeListener);
//creat a simple form
urlLabel.setText("Enter URL:");
urlLabel.setBounds(100,36,288,24);
formTab.add(urlLabel);
url.setBounds(170,36,288,24);
formTab.add(url);
current.setText("Currently Processing: ");
current.setBounds(100,80,288,24);
formTab.add(current);
//add scroll bars to the error messages screen and website structure
errorPane.setAutoscrolls(true);
errorPane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
errorPane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
errorPane.setOpaque(true);
errorTab.add(errorPane);
errorPane.setBounds(0,0,580,490);
errorText.setEditable(false);
errorPane.getViewport().add(errorText);
errorText.setBounds(0,0,600,550);
treePane.setAutoscrolls(true);
treePane.setHorizontalScrollBarPolicy(javax.swing.
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
treePane.setVerticalScrollBarPolicy(javax.swing.
ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
treePane.setOpaque(true);
treeTab.add(treePane);
treePane.setBounds(0,0,580,490);
treeText.setEditable(false);
treePane.getViewport().add(treeText);
treeText.setBounds(0,0,600,550);
//JTree
// NEW CODE
rootNode = new DefaultMutableTreeNode("Root Node");
treeModel = new DefaultTreeModel(rootNode);
treeModel.addTreeModelListener(new MyTreeModelListener());
tree = new JTree(treeModel);
tree.setEditable(true);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
treeText.add(tree);
//create the tabbed window
centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
//add the tool bar and tabbed pane
getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
*create the tool bar pane, a center pane, add the buttons,
*labels, tabs, a text field for user input here
javax.swing.JPanel toolBar = new javax.swing.JPanel();
javax.swing.JButton start = new javax.swing.JButton();
javax.swing.JButton cancel = new javax.swing.JButton();
javax.swing.JButton close = new javax.swing.JButton();
javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
javax.swing.JPanel formTab = new javax.swing.JPanel();
javax.swing.JLabel urlLabel = new javax.swing.JLabel();
javax.swing.JLabel current = new javax.swing.JLabel();
javax.swing.JTextField url = new javax.swing.JTextField();
javax.swing.JPanel errorTab = new javax.swing.JPanel();
javax.swing.JTextArea errorText = new javax.swing.JTextArea();
javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
javax.swing.JPanel treeTab = new javax.swing.JPanel();
javax.swing.JTextArea treeText = new javax.swing.JTextArea();
javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
javax.swing.JTree tree = new javax.swing.JTree();
*show the gui
public static void main(String args[])
(new gui()).setVisible(true);
*listen for the button presses and set the
*boolean flag depending on which button is pressed
class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
Object object = event.getSource();
if (object == start)
run = true;
startActionPerformed(event);
if (object == cancel)
run = false;
startActionPerformed(event);
if (object == close)
System.exit(0);
*this method is called when the start or
*cancel button is pressed.
void startActionPerformed (ActionEvent event)
if (run == true && bgThread == null)
bgThread = new Thread(this);
bgThread.start();
//new line of code
treeText.addObject(msgInfo);
if (run == false && bgThread != null)
webSpider.cancel();
*this mehtod will start the background thred.
*the background thread is required so that the
*GUI is still displayed
public void run()
try
webSpider = new WebSpider(this);
webSpider.clear();
urlInput = new URL(url.getText());
webSpider.addURL(urlInput);
webSpider.run();
bgThread = null;
catch (MalformedURLException e)
addressError addErr = new addressError();
addErr.addMsg = "URL ERROR - PLEASE CHECK";
SwingUtilities.invokeLater(addErr);
*this method is called by the web spider
*once a url is found. Validation of navigation
*happens here.
public boolean urlFound(URL urlInput,URL url)
CurrentlyProcessing pro = new CurrentlyProcessing();
pro.msg = url.toString();
SwingUtilities.invokeLater(pro);
if (!testLink(url))
navigationError navErr = new navigationError();
navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
brokenUrl = url.toString();
return false;
if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
return false;
else
return true;
*this method is returned if there is no link
*on a web page, e.g. there us a dead end
public void urlNotFound(URL urlInput)
deadEnd dEnd = new deadEnd();
dEnd.dEMsg = "No links on "+urlInput+"\n";
deadUrl = urlInput.toString();
*this method is called internally to check
*that a link works
protected boolean testLink(URL url)
try
URLConnection connection = url.openConnection();
connection.connect();
goodUrl = url.toString();
return true;
catch (IOException e)
return false;
*this method is called when an error is
*found.
public void urlError(URL url)
*this method is called when an email
*address is found
public void emailFound(String email)
/*this method will update any errors found inc
*address errors and broken links
class addressError implements Runnable
public String addMsg;
public void run()
current.setText("Currently Processing: "+ addMsg);
errorText.append(addMsg);
class navigationError implements Runnable
public String navMsg;
public void run()
errorText.append(navMsg);
class deadEnd implements Runnable
public String dEMsg;
public void run()
errorText.append(dEMsg);
*this method will update the currently
*processing field on the GUI
public class CurrentlyProcessing implements Runnable
public String msg;
//new line
public String msgInfo = msg;
public void run()
current.setText("Currently Processing: " + msg );
* NEW CODE
* NEED THIS CODE SOMEWHERE
* treeText.addObject(msgInfo);
public DefaultMutableTreeNode addObject(Object child)
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = tree.getSelectionPath();
if (parentPath == null)
parentNode = rootNode;
else
parentNode = (DefaultMutableTreeNode)
(parentPath.getLastPathComponent());
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child)
return addObject(parent, child, false);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child,boolean shouldBeVisible)
DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(child);
if (parent == null)
parent = rootNode;
treeModel.insertNodeInto(childNode, parent, parent.getChildCount());
if (shouldBeVisible)
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
public class MyTreeModelListener implements TreeModelListener
public void treeNodesChanged (TreeModelEvent e)
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
(e.getTreePath().getLastPathComponent());
try
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
(node.getChildAt(index));
catch (NullPointerException exc)
public void treeNodesInserted(TreeModelEvent e)
public void treeStructureChanged(TreeModelEvent e)
public void treeNodesRemoved(TreeModelEvent e)
I beleive that this line of code is required:
treeText.addObject(msgInfo);
I have placed it where the action events start the spider, but i keep getting this error:
cannot resolve symbol
symbol : method addObject (java.lang.String)
location: class javax.swing.JTextArea
treeText.addObject(msgInfo);
Also the jtree is not showing the window that I want it to and I am not too sure why. could you have a look to see why? i think it needs a fresh pair of eyes.
Many thanks
MrV -
Hi,
I have developed a webspider that cycles through a website detecting all urls and checking for borken links. I currently have build a JTree that takes the current url that is being processed and creates a string and adds it to a JTree. The problem I have is that the urls are printed in the JTree as one long list, e.g.
|Test
|____url 1
|____url 1a
|____url 2
|____url 2a
I would like it to disply like this:
|Test
|____url 1
|-------|____url 1a
|____url 2
|-------|____url 2a
(I have had to place the dashes in so it displays properly)
So that the strucutre of the website can be seen. I have read the JTree tutroial and my code looks like this, sorry its large i'm not too sure which bits to cut out:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
public class gui extends JFrame implements Runnable
*declare variable, boolean
*thread, a object and a center
*pane
protected URL urlInput;
protected Thread bgThread;
protected boolean run = false;
protected WebSpider webSpider;
public String brokenUrl;
public String goodUrl;
public String deadUrl;
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
public gui()
*create the gui here
setTitle("Testing Tool");
setSize(600,600);
//add Buttons to the tool bar
start.setText("Start");
start.setActionCommand("Start");
toolBar.add(start);
ButtonListener startListener = new ButtonListener();
start.addActionListener(startListener);
cancel.setText("Cancel");
cancel.setActionCommand("Cancel");
toolBar.add(cancel);
ButtonListener cancelListener = new ButtonListener();
cancel.addActionListener(cancelListener);
clear.setText("Clear");
clear.setActionCommand("Clear");
toolBar.add(clear);
ButtonListener clearListener = new ButtonListener();
clear.addActionListener(clearListener);
close.setText("Close");
close.setActionCommand("Close");
toolBar.add(close);
ButtonListener closeListener = new ButtonListener();
close.addActionListener(closeListener);
//creat a simple form
urlLabel.setText("Enter URL:");
urlLabel.setBounds(100,36,288,24);
formTab.add(urlLabel);
url.setBounds(170,36,288,24);
formTab.add(url);
current.setText("Currently Processing: ");
current.setBounds(100,80,288,24);
formTab.add(current);
//add the scrol pane and text area to the error tab
errorTab.add(errorPane);
errorPane.setBounds(0,0,580,490);
errorPane.getViewport().add(errorText);
//add the scroll pane to the tree tab
treeTab.add(treePane);
treePane.setBounds(0,0,580,490);
//create the JTree
rootNode = new DefaultMutableTreeNode("Test");
treeModel = new DefaultTreeModel(rootNode);
treeModel.addTreeModelListener(new MyTreeModelListener());
tree = new JTree(treeModel);
tree.setEditable(true);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
treePane.getViewport().add(tree);
//create the tabbed window
centerPane.setBorder(new javax.swing.border.EtchedBorder());
formTab.setLayout(null);
errorTab.setLayout(null);
treeTab.setLayout(null);
centerPane.addTab("Search Parameters", formTab);
centerPane.addTab("Error Messages", errorTab);
centerPane.addTab("Website Structure", treeTab);
//add the tool bar and tabbed pane
getContentPane().add(toolBar, java.awt.BorderLayout.NORTH);
getContentPane().add(centerPane, java.awt.BorderLayout.CENTER);
*create the tool bar pane, a center pane, add the buttons,
*labels, tabs, a text field for user input here
javax.swing.JPanel toolBar = new javax.swing.JPanel();
javax.swing.JButton start = new javax.swing.JButton();
javax.swing.JButton cancel = new javax.swing.JButton();
javax.swing.JButton clear = new javax.swing.JButton();
javax.swing.JButton close = new javax.swing.JButton();
javax.swing.JTabbedPane centerPane = new javax.swing.JTabbedPane();
javax.swing.JPanel formTab = new javax.swing.JPanel();
javax.swing.JLabel urlLabel = new javax.swing.JLabel();
javax.swing.JLabel current = new javax.swing.JLabel();
javax.swing.JTextField url = new javax.swing.JTextField();
javax.swing.JPanel errorTab = new javax.swing.JPanel();
javax.swing.JTextArea errorText = new javax.swing.JTextArea();
javax.swing.JScrollPane errorPane = new javax.swing.JScrollPane();
javax.swing.JPanel treeTab = new javax.swing.JPanel();
javax.swing.JScrollPane treePane = new javax.swing.JScrollPane();
javax.swing.JTree tree = new javax.swing.JTree();
*show the gui
public static void main(String args[])
(new gui()).setVisible(true);
*listen for the button presses and set the
*boolean flag depending on which button is pressed
class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
Object object = event.getSource();
if (object == start)
run = true;
startActionPerformed(event);
if (object == cancel)
run = false;
startActionPerformed(event);
if (object == clear)
errorText.setText("");
rootNode.removeAllChildren();
treeModel.reload();
if (object == close)
System.exit(0);
*this method is called when the start or
*cancel button is pressed.
void startActionPerformed (ActionEvent event)
if (run == true && bgThread == null)
bgThread = new Thread(this);
bgThread.start();
if (run == false && bgThread != null)
webSpider.cancel();
*this mehtod will start the background thred.
*the background thread is required so that the
*GUI is still displayed
public void run()
try
webSpider = new WebSpider(this);
webSpider.clear();
urlInput = new URL(url.getText());
webSpider.addURL(urlInput);
webSpider.run();
bgThread = null;
catch (MalformedURLException e)
addressError addErr = new addressError();
addErr.addMsg = "URL ERROR - PLEASE CHECK";
SwingUtilities.invokeLater(addErr);
*this method is called by the web spider
*once a url is found. Validation of navigation
*happens here.
public boolean urlFound(URL urlInput,URL url)
CurrentlyProcessing pro = new CurrentlyProcessing();
pro.msg = url.toString();
SwingUtilities.invokeLater(pro);
if (!testLink(url))
navigationError navErr = new navigationError();
navErr.navMsg = "Broken Link "+url+" caused on "+urlInput+"\n";
brokenUrl = url.toString();
return false;
if (!url.getHost().equalsIgnoreCase(urlInput.getHost()))
return false;
else
return true;
//this method is returned if there is no link on a web page
public void urlNotFound(URL urlInput)
deadEnd dEnd = new deadEnd();
dEnd.dEMsg = "No links on "+urlInput+"\n";
deadUrl = urlInput.toString();
//this method is called internally to check that a link works
protected boolean testLink(URL url)
try
URLConnection connection = url.openConnection();
connection.connect();
goodUrl = url.toString();
return true;
catch (IOException e)
return false;
//this method is called when an error is found
public void urlError(URL url)
//this method is called when an email address is found
public void emailFound(String email)
//this method will update any navigation errors found
class addressError implements Runnable
public String addMsg;
public void run()
current.setText("Currently Processing: "+ addMsg);
errorText.append(addMsg);
class navigationError implements Runnable
public String navMsg;
public void run()
errorText.append(navMsg);
class deadEnd implements Runnable
public String dEMsg;
public void run()
errorText.append(dEMsg);
//this method will update the currently processing field on the GUI
public class CurrentlyProcessing implements Runnable
public String msg;
//public String msgInfo = msg;
public void run()
current.setText("Currently Processing: " + msg );
addObject(msg);
//add a node to the tree
public DefaultMutableTreeNode addObject (Object child)
DefaultMutableTreeNode parentNode = null;
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,Object child,boolean shouldBeVisible)
DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(child);
if (parent == null)
parent = rootNode;
treeModel.insertNodeInto(childNode, parent, parent.getChildCount());
if (shouldBeVisible)
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
//listener for the tree model
public class MyTreeModelListener implements TreeModelListener
public void treeNodesChanged (TreeModelEvent e)
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
(e.getTreePath().getLastPathComponent());
try
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
(node.getChildAt(index));
catch (NullPointerException exc)
public void treeNodesInserted(TreeModelEvent e)
public void treeStructureChanged(TreeModelEvent e)
public void treeNodesRemoved(TreeModelEvent e)
}It uses a class called webspider which i have not attached, if required please let me know. I beleive that in addObject I am adding all nodes to the root as children.
Any help would be much appreciated.
Many Thanks
MRvI would recomend you create your own JTree class for this.
Here are a few things I set in my constructor within the JTree:
// turn on tooltips
ToolTipManager.sharedInstance().registerComponent(this);
// used by two setters so create reference
RollupTreeCellRenderer renderer = new RollupTreeCellRenderer();
// customizing the icons for the tree
// setting the folder icons
renderer.setOpenIcon(IconLoader.getIcon("Open.gif"));
renderer.setClosedIcon(IconLoader.getIcon("Folder.gif"));
// inventory icon
renderer.setLeafIcon(IconLoader.getIcon("Document.gif"));
// add renderer to highlight Inventory nodes with Red or Blue text
setCellRenderer(renderer);
Here is the renderer class example:
class RollupTreeCellRenderer
extends DefaultTreeCellRenderer
* Configures the renderer based on the passed in components.
* The value is set from messaging the tree with
* <code>convertValueToText</code>, which ultimately invokes
* <code>toString</code> on <code>value</code>.
* The foreground color is set based on the selection and the icon
* is set based on on leaf and expanded.
* @param tree JTree
* @param value Object
* @param sel boolean
* @param expanded boolean
* @param leaf boolean
* @param row int
* @param hasFocus boolean
* @return Component
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean sel,
boolean expanded,
boolean leaf, int row,
boolean hasFocus)
// call super for default behavior
super.getTreeCellRendererComponent(tree,
value,
sel,
expanded,
leaf,
row,
hasFocus);
// if the current node is selected do NOT over-ride
// the default colors
if (sel)
return this;
// cast to our wrapper Node class
RollupNode node = (RollupNode) value;
if (node.isInventory())
if (RollupMediator.getInstance().nodeInList(node))
setForeground(RollupTree.FOUND);
setToolTipText("Click to find positions count");
else
setForeground(RollupTree.NOT_FOUND);
setToolTipText("Inventory not in current business date");
else
setToolTipText("Double click to edit name");
return this;
} // Renderer
Let me know if you need more examples.
BTW
I the TreeCellRenderer example is not public so I can add it to the bottom of the file that contains my custom JTree. -
Add node to a specific node in JTree
I use the following TreePanel class to add node to the tree. My question is how to add a new node under
a specific node which has been created before. In other words, how to get the path and identify the node.
For e.g., I first loaded some raw data files and created the "raw data" node, later I need to load another file
and create a new node under the "raw data" node. Each node is created by using user object. Any help is greatly appreicated.
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public class TreePanel extends JPanel {
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
protected JTree tree;
public TreePanel() {
super(new GridLayout(1,0));
rootNode = new DefaultMutableTreeNode("Experiment");
treeModel = new DefaultTreeModel(rootNode);
tree = new JTree(treeModel);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
JScrollPane scrollPane = new JScrollPane(tree);
add(scrollPane);
public JTree getTree(){
return tree;
/* Add child to the currently selected node. */
public DefaultMutableTreeNode addObject(Object child){
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = tree.getSelectionPath();
if(parentPath == null){
parentNode = rootNode;
else{
parentNode = (DefaultMutableTreeNode)(parentPath.getLastPathComponent());
return addObject(parentNode, child, true);
/* Add child */
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent, Object child){
return addObject(parent, child, false);
/* Add child */
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent, Object child, boolean shouldBeVisible){
DefaultMutableTreeNode childNode = new DefaultMutableTreeNode(child);
if(parent == null){parent = rootNode;}
treeModel.insertNodeInto(childNode, parent, parent.getChildCount());
if(shouldBeVisible){
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
/* Add child */
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent, DefaultMutableTreeNode child){
if(parent == null){parent = rootNode;}
treeModel.insertNodeInto(child, parent, parent.getChildCount());
return child;
}Thanks in advance!public static DefaultMutableTreeNode findNode(DefaultMutableTreeNode from, Object userObject) {
if (userObject == null && from.getUserObject() == null) {
return from;
} else if (userObject.equals(from.getUserObject())) {
return from;
DefaultMutableTreeNode node = null;
for (int i = 0; i < from.getChildCount(); i ++) {
node = (DefaultMutableTreeNode) from.getChildAt(i);
if (userObject == null) {
if (userObject == node.getUserObject()) {
break;
} else {
if (userObject.equals(node.getUserObject())) {
break;
node = null;
if (node != null) {
return node;
//Node not found
//dig deeper
for (int i = 0; i < from.getChildCount(); i ++) {
node = (DefaultMutableTreeNode) from.getChildAt(i);
if (!node.isLeaf()) {
node = findNode(node, userObject);
if (node != null) {
return node;
//Not found
return null;
} -
Icon CHANGE in Node Renaming for JTree
HI all ,
In JTree, V can rename a DefaultMutableTreeNode , by pressing F2 or triple click .
By using the DefaultTreeCellRenderer ,
I applied icons also by -- tree.setCellRenderer(myCellRenderer);
But at the time of renaming , or when v press F2 ,
the icon is changed to default settings ( leafIcon / openIcon / closedIcon ).
How can I apply other Icons to nodes at the time of node renaming ?
Please help ..
ThanksMyTreeCellRenderer treeCellRenderer = new MyTreeCellRenderer();
DefaultTreeCellEditor treeCellEditor = new MyTreeCellEditor(tree, treeCellRenderer);;
MyTreeCellEditorListener cellEditorListener = new MyTreeCellEditorListener();
treeModel = new DefaultTreeModel (rootNode);
tree = new JTree(treeModel);
treeCellEditor.addCellEditorListener(cellEditorListener);
tree.setCellEditor(treeCellEditor);
tree.setCellRenderer(treeCellRenderer);
I am renaming the leaf nodes and MyTreeCellRenderer class override the method
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus)
and set a different icon to the leaf nodes.
And when i am renaming a leaf node , the default ( leafIcon ) icon will come only to the renaming node at the time of renaming . When i hit the enter key . the default leafIcon will disappear and my customised icon will come .........
My question is that at the time of renaming ........ How v can getback the customised icon ?
thanks -
Custom Jtree Cell Renderer goes to infinite loopp...any suggestion???
Hey ...thanks for you help before....
Another problem..
My Jtree works fine with default Cell Renderer .. but goes to infinite
loop with CustomDefaultRenderer after few minutes...
Any suggestions....
public DynamicTree() {
super(new GridLayout(1,0));
rootNode = new DefaultMutableTreeNode("POSTINGS & SEARCHES");
treeModel = new DefaultTreeModel(rootNode);
treeModel.addTreeModelListener(new MyTreeModelListener());
tree = new JTree(treeModel);
tree.setEditable(false);
tree.getSelectionModel().setSelectionMode
(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
// tree.addMouseListener(ml);
// tree.addKeyListener(kl);
JScrollPane scrollPane = new JScrollPane(tree);
add(scrollPane);
// tree.setCellRenderer();
tree.addTreeSelectionListener(new TreeSelectionListener(){
public void valueChanged(TreeSelectionEvent evt){
System.out.println("Tree's lead selection path is " +
tree.getLeadSelectionPath());
tree.setCellRenderer( new CustomDefaultRenderer());
public class CustomDefaultRenderer extends DefaultTreeCellRenderer {
String suffix = null ;
String prefix = null ;
boolean expired = false;
boolean matched = false ;
PostingHandler pHandler = new PostingHandler();
public Component getTreeCellRendererComponent(
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus) {
super.getTreeCellRendererComponent(
tree, value, sel,
expanded, leaf, row,
hasFocus);
suffix = (String)value.toString() ;
try {
prefix = value.toString().substring(0,value.toString().indexOf(":") + 1);
suffix = suffix.substring(suffix.indexOf(":")+1,suffix.length());
System.out.println("Prefix:"+prefix +"\tSufix :"+suffix);
}catch (Exception e){System.out.println("Nothing to index yet" + e);}
// value = (Object)suffix;
if(pHandler.newPostingsMatch.contains(prefix)) {
// if(hasFocus){pHandler.removePostingMatch(prefix);}
setBackgroundNonSelectionColor(Color.CYAN);
}else
setBackgroundNonSelectionColor(Color.WHITE);
System.out.println("Other <>values:\tValue" + value.toString() + "\tSEL:"+sel +"\tExpanded:" + "\tLEAF:"+leaf +
"\tRow:" +row + "\tfocus:"+hasFocus );
return this;
public void paintComponent(Graphics g){
System.out.println("Paint is called");
//g.drawLine(0, 0, 100, 100);
if(expired){
g.drawLine(22, 11, 100,11);
g.drawString(suffix, 22,15);
validate();
repaint();
}Figured it out right after this post :)
I had to do the following in my cellrenderer
setBackgroundNonSelectionColor(new Color(0, 0, 0, 0));As a parameter I sent a color object with a alpha level of 0 (completly transparent)... -
No idea how to reference nodes in a JTree
I have created a simple Tree with
Container cp=getContentPane();
root= new DefaultMutableTreeNode("root");
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
TreeSelectionModel tsm= new DefaultTreeSelectionModel();
cp.add(new JScrollPane(tree));
treeModel.insertNodeInto(new DefaultMutableTreeNode("xx"), root, 0);
treeModel.insertNodeInto(new DefaultMutableTreeNode("yy"), root, 1);
treeModel.insertNodeInto(new DefaultMutableTreeNode("zz"), root, 2);Which looks like
root
|--xx
|--yy
|--zzIf I want to create a child of yy, say "yychild", later in the course of the program runtime, and I know the path (root->yy->yychild), how do I have to do it??
root
|--xx
|--yy --yychild
|--zzIs there a insert-command which accepts a path?Thanx to all, that's my solution:
nx=new DefaultMutableTreeNode("xx");
ny=new DefaultMutableTreeNode("yy");
nz=new DefaultMutableTreeNode("zz");
treeModel.insertNodeInto(nx, root, 0);
treeModel.insertNodeInto(ny, root, 1);
treeModel.insertNodeInto(nz, root, 2);
Enumeration e = root.breadthFirstEnumeration();
yy_child = new DefaultMutableTreeNode("yy_child");
while (e.hasMoreElements()) {
MutableTreeNode myNode = (MutableTreeNode) e.nextElement();
System.out.println(myNode.toString());
if (myNode.toString().equals("yy")) treeModel.insertNodeInto(yy_child,myNode , 0);
... -
How to dislay a frame when i clck on the node or leaf on the JTree
Hi All,
Iam doing project on swing. In that iam doing with JTree. The Jtree is displaying on the left side of the splitpane .My problem is if i click on the nodes or leaf in the JTree one panel should be open in on the right side of the spltpane. Iam pasting the code.please can any body knows the solution please send me.
regards
sonali
import java.awt.*;
import javax.swing.*;
import javax.swing.BorderFactory;
import javax.swing.border.*;
import java.awt.event.*;
import javax.swing.tree.*;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.event.TreeSelectionListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.tree.TreeSelectionModel;
import javax.swing.tree.DefaultTreeCellRenderer;
import java.net.URL;
import javax.swing.*;
import java.io.IOException;
import javax.swing.JEditorPane;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JFrame;
import Test.Test1;
public class JFrame1 extends javax.swing.JFrame {
JScrollPane sp;
JPanel topPanel;
JPanel leftPanel;
JPanel bottomPanel;
JPanel rightPanel;
Border b ;
JTree tree;
DefaultTreeModel treeModel;
public JFrame1(){
getContentPane().setLayout(null);
setSize(405,305);
setVisible(false);
JPanel1.setLayout(null);
getContentPane().add(JPanel1);
JPanel1.setLayout(new GridLayout(1, 1));
JPanel1.setBounds(0,0,405,305);
JPanel1.add(JSplitPane1);
JSplitPane1.setBounds(0,5,405,305);
JSplitPane1.setContinuousLayout(false);
topPanel = new JPanel();
leftPanel = new JPanel();
bottomPanel = new JPanel();
topPanel.setLayout(new FlowLayout());
leftPanel.setLayout(null);
b = new EtchedBorder();
leftPanel.setBorder(b);
leftPanel.setBounds(0,0,300,305);
bottomPanel.setLayout(new FlowLayout());
rightPanel = new JPanel();
rightPanel.setBounds(108, 0, 300, 305);
JSplitPane1.setRightComponent(rightPanel);
JSplitPane1.setLeftComponent(leftPanel);
rightPanel.setLayout(null);
topPanel.setBounds(0,0,305,25);
b = new EtchedBorder(0);
topPanel.setBorder(b);
bottomPanel.setBounds(0,26,300,280);
b = new BevelBorder(1, Color.black,Color.black);
bottomPanel.setBorder(b);
rightPanel.add(topPanel);
rightPanel.add(bottomPanel);
JSplitPane1.setDividerLocation(120);
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode subroot = new DefaultMutableTreeNode("SubRoot");
DefaultMutableTreeNode leaf1 = new DefaultMutableTreeNode("Leaf 1");
DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode("Leaf 2");
DefaultMutableTreeNode leaf3 = new DefaultMutableTreeNode("Leaf 3");
DefaultMutableTreeNode subroot1 = new DefaultMutableTreeNode("SubRoot1");
DefaultMutableTreeNode leaf11 = new DefaultMutableTreeNode("Leaf 11");
DefaultMutableTreeNode leaf21 = new DefaultMutableTreeNode("Leaf 21");
DefaultMutableTreeNode leaf31 = new DefaultMutableTreeNode("Leaf 31 skfjdsf sfjfdsl fslfkjdsfl sflkjaflksdfdslfjds lfsdlkfjdslk sdsdlkfjdsla fflkdasjfdslkjal");
DefaultMutableTreeNode subroot2 = new DefaultMutableTreeNode("SubRoot2");
DefaultMutableTreeNode leaf12 = new DefaultMutableTreeNode("Leaf 12");
DefaultMutableTreeNode leaf22 = new DefaultMutableTreeNode("Leaf 22");
DefaultMutableTreeNode leaf32 = new DefaultMutableTreeNode("Leaf 32");
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
treeModel.insertNodeInto(subroot, root, 0);
treeModel.insertNodeInto(leaf1, subroot, 0);
treeModel.insertNodeInto(leaf2, root, 1);
treeModel.insertNodeInto(leaf3, root, 2);
treeModel.insertNodeInto(subroot1, root, 3);
treeModel.insertNodeInto(leaf11, subroot1, 0);
treeModel.insertNodeInto(leaf21, subroot1, 1);
treeModel.insertNodeInto(leaf31, subroot1, 2);
treeModel.insertNodeInto(subroot2, root, 3);
treeModel.insertNodeInto(leaf12, subroot2, 0);
treeModel.insertNodeInto(leaf22, subroot2, 1);
treeModel.insertNodeInto(leaf32, subroot2, 2);
sp = new JScrollPane();
sp.setBounds(0,0,300,305);
sp.getViewport().add(tree);
sp.setViewportBorder(BorderFactory.createRaisedBevelBorder());
leftPanel.add(sp,BorderLayout.CENTER);
// SymPropertyChange lSymPropertyChange = new SymPropertyChange();
// JSplitPane1.addPropertyChangeListener(lSymPropertyChange);
SymWindow aSymWindow = new SymWindow();
this.addWindowListener(aSymWindow);
SymComponent aSymComponent = new SymComponent();
this.addComponentListener(aSymComponent);
public JFrame1(String sTitle)
this();
setTitle(sTitle);
public void setVisible(boolean b)
if (b)
setLocation(50, 50);
super.setVisible(b);
static public void main(String args[])
(new JFrame1()).setVisible(true);
public void addNotify()
Dimension size = getSize();
super.addNotify();
if (frameSizeAdjusted)
return;
frameSizeAdjusted = false;
Insets insets = getInsets();
javax.swing.JMenuBar menuBar = getRootPane().getJMenuBar();
int menuBarHeight = 0;
if (menuBar != null)
menuBarHeight = menuBar.getPreferredSize().height;
setSize(insets.left + insets.right + size.width, insets.top + insets.bottom + size.height + menuBarHeight);
boolean frameSizeAdjusted = false;
javax.swing.JPanel JPanel1 = new javax.swing.JPanel();
javax.swing.JSplitPane JSplitPane1 = new javax.swing.JSplitPane();
/*class SymPropertyChange implements java.beans.PropertyChangeListener{
public void propertyChange(java.beans.PropertyChangeEvent event){
Object object = event.getSource();
if (object == JSplitPane1)
JSplitPane1_propertyChange(event);
/* void JSplitPane1_propertyChange(java.beans.PropertyChangeEvent event){
System.out.println("!");
sp.setSize((int)JSplitPane1.getLeftComponent().getBounds().getWidth()-2,(int)JSplitPane1.getLeftComponent().getBounds().getHeight()-2 );
sp.repaint();
tree.repaint();
class SymWindow extends java.awt.event.WindowAdapter{
public void windowActivated(java.awt.event.WindowEvent event){
Object object = event.getSource();
if (object == JFrame1.this)
JFrame1_windowActivated(event);
public void windowIconified(java.awt.event.WindowEvent event){
Object object = event.getSource();
if (object == JFrame1.this)
JFrame1_windowIconified(event);
void JFrame1_windowIconified(java.awt.event.WindowEvent event){
void JFrame1_windowActivated(java.awt.event.WindowEvent event){
class SymComponent extends java.awt.event.ComponentAdapter{
public void componentShown(java.awt.event.ComponentEvent event){
Object object = event.getSource();
if (object == JFrame1.this)
JFrame1_componentShown(event);
public void componentResized(java.awt.event.ComponentEvent event){
Object object = event.getSource();
if (object == JFrame1.this)
JFrame1_componentResized(event);
void JFrame1_componentResized(java.awt.event.ComponentEvent event){
System.out.println("!!");
JPanel1.setSize(this.getContentPane().getMaximumSize());
JSplitPane1.setSize((int)JPanel1.getMaximumSize().getWidth()-5,(int)JPanel1.getMaximumSize().getHeight()-5 );
topPanel.setBounds(0, 0, rightPanel.getWidth()-3, 25);
bottomPanel.setBounds(0,26,rightPanel.getWidth()-3,rightPanel.getHeight()-28);
sp.setSize((int)leftPanel.getMaximumSize().getWidth(),(int)leftPanel.getMaximumSize().getHeight());
sp.setAutoscrolls(true);
//sp.setSize((int)JSplitPane1.getLeftComponent().getBounds().getWidth()-2,(int)JSplitPane1.getLeftComponent().getBounds().getHeight()-2 );
sp.repaint();
//sp.setSize((int)leftPanel.getSize().getWidth(),(int)leftPanel.getSize().getHeight() );
void JFrame1_componentShown(java.awt.event.ComponentEvent event){
System.out.println("!!!");
JPanel1.setSize(this.getContentPane().getMaximumSize());
JSplitPane1.setSize((int)JPanel1.getMaximumSize().getWidth()-5,(int)JPanel1.getMaximumSize().getHeight()-5 );
topPanel.setBounds(0, 0, rightPanel.getWidth()-3, 25);
sp.setSize((int)JSplitPane1.getLeftComponent().getBounds().getWidth()-2,(int)JSplitPane1.getLeftComponent().getBounds().getHeight()-2 );
sp.repaint();
bottomPanel.setBounds(0,26,rightPanel.getWidth()-3,rightPanel.getHeight()-28);
}hi sculz,
i develped the tree, and tree selection listener also the 4 th point i didnt able to do . here is the code belo what i did.
iam not able to add the JSplit pane also.
import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class Tree08 extends JFrame{
Hashtable theHashtable = new Hashtable();
int frameWidth = 300;
int frameHeight = 305;
int numberRows = 19;
JTree tree;
JPanel treePanel;
String plafClassName =
"com.sun.java.swing.plaf.motif.MotifLookAndFeel";
For future reference, the three plaf implementations
are:
com.sun.java.swing.plaf.metal.MetalLookAndFeel
com.sun.java.swing.plaf.motif.MotifLookAndFeel
com.sun.java.swing.plaf.windows.WindowsLookAndFeel
JLabel display;
public static void main(String args[]) {
new Tree08();
public Tree08 () {
theHashtable.put("Cabbage","Good in slaw");
theHashtable.put("Squash","The yellow variety");
theHashtable.put("Onion","Not too hot");
theHashtable.put("Squirrel","Likes to store nuts");
theHashtable.put("Rabbit","Runs fast");
theHashtable.put("Fox","Crazy like a ...");
theHashtable.put("Horse","Fun to ride");
theHashtable.put("Pig","Lives in mud");
theHashtable.put("Cow","Gives us milk");
theHashtable.put("Peach","From Georgia");
theHashtable.put("Grape","Saueeze into wine");
theHashtable.put("Apple","Red delicious");
theHashtable.put("Orange","Very juicy");
DefaultMutableTreeNode[] theTreeNodes = new
DefaultMutableTreeNode[numberRows];
theTreeNodes[0] = new DefaultMutableTreeNode("Sample
Tree");
theTreeNodes[1] = new
DefaultMutableTreeNode("Vegetables");
theTreeNodes[2] = new
DefaultMutableTreeNode("Cabbage");
theTreeNodes[3] = new
DefaultMutableTreeNode("Squash");
theTreeNodes[4] = new
DefaultMutableTreeNode("Onion");
theTreeNodes[5] = new
DefaultMutableTreeNode("Animals");
theTreeNodes[6] = new
DefaultMutableTreeNode("Forrest");
theTreeNodes[7] = new
DefaultMutableTreeNode("Squirrel");
theTreeNodes[8] = new
DefaultMutableTreeNode("Rabbit");
theTreeNodes[9] = new DefaultMutableTreeNode("Fox");
theTreeNodes[10] = new
DefaultMutableTreeNode("Farm");
theTreeNodes[11] = new
DefaultMutableTreeNode("Horse");
theTreeNodes[12] = new DefaultMutableTreeNode("Pig");
theTreeNodes[13] = new DefaultMutableTreeNode("Cow");
theTreeNodes[14] = new
DefaultMutableTreeNode("Fruit");
theTreeNodes[15] = new
DefaultMutableTreeNode("Peach");
theTreeNodes[16] = new
DefaultMutableTreeNode("Grape");
theTreeNodes[17] = new
DefaultMutableTreeNode("Apple");
theTreeNodes[18] = new
DefaultMutableTreeNode("Orange");
theTreeNodes[0].add(theTreeNodes[1]);
theTreeNodes[1].add(theTreeNodes[2]);
theTreeNodes[1].add(theTreeNodes[3]);
theTreeNodes[1].add(theTreeNodes[4]);
theTreeNodes[0].add(theTreeNodes[5]);
theTreeNodes[5].add(theTreeNodes[6]);
theTreeNodes[6].add(theTreeNodes[7]);
theTreeNodes[6].add(theTreeNodes[8]);
theTreeNodes[6].add(theTreeNodes[9]);
theTreeNodes[5].add(theTreeNodes[10]);
theTreeNodes[10].add(theTreeNodes[11]);
theTreeNodes[10].add(theTreeNodes[12]);
theTreeNodes[10].add(theTreeNodes[13]);
theTreeNodes[0].add(theTreeNodes[14]);
theTreeNodes[14].add(theTreeNodes[15]);
theTreeNodes[14].add(theTreeNodes[16]);
theTreeNodes[14].add(theTreeNodes[17]);
theTreeNodes[14].add(theTreeNodes[18]);
treePanel = new TreePanel(theTreeNodes[0]);
tree.addTreeSelectionListener(new MyTreeListener());
Container content = getContentPane();
content.add(treePanel,BorderLayout.CENTER);
display = new JLabel("Display Selection Here");
content.add(display,BorderLayout.SOUTH);
setSize(frameWidth, frameHeight);
setTitle("Copyright 1998, R.G.Baldwin");
setVisible(true);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);}
class MyTreeListener implements TreeSelectionListener{
public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode theNode =
(DefaultMutableTreeNode)
(e.getPath().getLastPathComponent());
if (theNode.isLeaf()) {
display.setText((String)theHashtable.get(
theNode.getUserObject()));
class TreePanel extends JPanel {
public TreePanel(TreeNode root){
setLayout(new BorderLayout());
tree = new JTree(root);
JScrollPane sp = new JScrollPane(tree);
add(sp, BorderLayout.CENTER);
try{
UIManager.setLookAndFeel(plafClassName);
}catch(Exception ex){System.out.println(ex);}
SwingUtilities.updateComponentTreeUI(this);
for(int cnt = 0; cnt < numberRows; cnt++){
tree.expandRow(cnt);
regards
sonali -
How to Create XML Schema From JTree ?
Please help me... Thank you.
This is Code
Tree.java ----- Run This File
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.tree.DefaultMutableTreeNode;
public class Tree extends JPanel implements ActionListener {
private int newNodeSuffix = 1;
private static String ADD_COMMAND = "add";
private static String REMOVE_COMMAND = "remove";
private static String CLEAR_COMMAND = "clear";
private static String OK_COMMAND = "ok";
private DynamicTree treePanel;
public Tree() {
super(new BorderLayout());
//Create the components.
treePanel = new DynamicTree();
//populateTree(treePanel);
JButton addButton = new JButton("Add");
addButton.setActionCommand(ADD_COMMAND);
addButton.addActionListener(this);
JButton removeButton = new JButton("Remove");
removeButton.setActionCommand(REMOVE_COMMAND);
removeButton.addActionListener(this);
JButton clearButton = new JButton("Clear");
clearButton.setActionCommand(CLEAR_COMMAND);
clearButton.addActionListener(this);
JButton okButton = new JButton("OK");
okButton.setActionCommand(OK_COMMAND);
okButton.addActionListener(this);
//Lay everything out.
treePanel.setPreferredSize(new Dimension(300, 150));
add(treePanel, BorderLayout.CENTER);
JPanel panel = new JPanel(new GridLayout(0,1));
panel.add(addButton);
panel.add(removeButton);
panel.add(clearButton);
panel.add(okButton);
add(panel, BorderLayout.LINE_END);
/*public void populateTree(DynamicTree treePanel) {
String p1Name = new String("Parent 1");
//String p2Name = new String("Parent 2");
String c1Name = new String("Child 1");
//String c2Name = new String("Child 2");
DefaultMutableTreeNode p1;
p1 = treePanel.addObject(null, p1Name);
//p2 = treePanel.addObject(null, p2Name);
treePanel.addObject(p1, c1Name);
//treePanel.addObject(p1, c2Name);
//treePanel.addObject(p2, c1Name);
//treePanel.addObject(p2, c2Name);
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (ADD_COMMAND.equals(command)) {
//Add button clicked.
treePanel.addObject("New Node " + newNodeSuffix++);
} else if (REMOVE_COMMAND.equals(command)) {
//Remove button clicked.
treePanel.removeCurrentNode();
} else if (CLEAR_COMMAND.equals(command)) {
//Clear button clicked.
treePanel.clear();
} else if (OK_COMMAND.equals(command)) {
//Ok button clicked.
treePanel.ok();
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("Craete XML Tree");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
Tree newContentPane = new Tree();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}DynamicTree.java
import javax.swing.JOptionPane;
import java.awt.GridLayout;
import java.awt.Toolkit;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
public class DynamicTree extends JPanel {
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
protected JTree tree;
private Toolkit toolkit = Toolkit.getDefaultToolkit();
public DynamicTree() {
super(new GridLayout(1,0));
rootNode = new DefaultMutableTreeNode("Root Node");
treeModel = new DefaultTreeModel(rootNode);
treeModel.addTreeModelListener(new MyTreeModelListener());
tree = new JTree(treeModel);
tree.setEditable(true);
tree.getSelectionModel().setSelectionMode
(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
JScrollPane scrollPane = new JScrollPane(tree);
add(scrollPane);
/** Remove all nodes except the root node. */
public void clear() {
rootNode.removeAllChildren();
treeModel.reload();
public void ok() {
int n = JOptionPane.showConfirmDialog(null, "Do you want to create XML Schema?", "", JOptionPane.YES_NO_OPTION);
/** Remove the currently selected node. */
public void removeCurrentNode() {
TreePath currentSelection = tree.getSelectionPath();
if (currentSelection != null) {
DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode)
(currentSelection.getLastPathComponent());
MutableTreeNode parent = (MutableTreeNode)(currentNode.getParent());
if (parent != null) {
treeModel.removeNodeFromParent(currentNode);
return;
// Either there was no selection, or the root was selected.
toolkit.beep();
/** Add child to the currently selected node. */
public DefaultMutableTreeNode addObject(Object child) {
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = tree.getSelectionPath();
if (parentPath == null) {
parentNode = rootNode;
} else {
parentNode = (DefaultMutableTreeNode)
(parentPath.getLastPathComponent());
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child) {
return addObject(parent, child, false);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child,
boolean shouldBeVisible) {
DefaultMutableTreeNode childNode =
new DefaultMutableTreeNode(child);
if (parent == null) {
parent = rootNode;
treeModel.insertNodeInto(childNode, parent,
parent.getChildCount());
//Make sure the user can see the lovely new node.
if (shouldBeVisible) {
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
class MyTreeModelListener implements TreeModelListener {
public void treeNodesChanged(TreeModelEvent e) {
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
(e.getTreePath().getLastPathComponent());
* If the event lists children, then the changed
* node is the child of the node we've already
* gotten. Otherwise, the changed node and the
* specified node are the same.
try {
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
(node.getChildAt(index));
} catch (NullPointerException exc) {}
System.out.println("The user has finished editing the node.");
System.out.println("New value: " + node.getUserObject());
public void treeNodesInserted(TreeModelEvent e) {
public void treeNodesRemoved(TreeModelEvent e) {
public void treeStructureChanged(TreeModelEvent e) {
}XML shema is basically an XML file. So u need to know how to create an XML,
provided u know how the shema file should be.
Creating an XML :
http://forum.java.sun.com/thread.jspa?threadID=5181031&messageID=9705786#9705786 -
How to disable selection of root node in JTree
Hi all! Thanks for taking a minute to read my post!
I am writing a really basic JTree for showing a list of items.
Here is some of the code:
/** Create a basic tree **/
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Title");
DefaultTreeModel treeModel = new DefaultTreeModel(rootNode);
JTree tree = new JTree(treeModel);
/** Method to return the string of the current highlighted selection **/
public String getSelectionString()
DefaultMutableTreeNode node =
tree.getSelectionPath().getLastPathComponent();
return (String)node.getUserObject();
I would like to disable selection of the root node of my JTree.
Thus, if I make a call to getSelectionString() above, it would return null instead of the string that represents the root label.
I have read the following forum on disabling various TreePaths and TreeNodes in a JTree:
http://forum.java.sun.com/thread.jsp?forum=57&thread=224691
This forum suggests implementing the TreeSelectionListener interface and the TreeSelectionModel class and over-riding the addSelectedPath() methods. I tried this suggestion, and I was able to enable and disable the different children of the Jtree, but the root of the JTree would not disable.
I suppose that I could just simply remove the visibility of the root node, but I really want to avoid that option if possible.
Wait --- let me be clear ---- I want to disable the selection of the root node only - still allowing selection of all its children.
Any suggestions?
Am I missing something really simple here?
Did I explain my problem clearly?
Thanks in advance!
jewelssimply try this..
in the
public void valueChanged(javax.swing.event.TreeSelectionEvent event);
method of TreeSelectionListener impelentation get the
TreePath tp = event.getPath();
from TreePath get the component and then remove the selection from the treePath if it is the node u were checking/root node in this case
tree.getSelectionModel().removeSelectionPath(tp);
Try out....
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