Major tree and display issue.........

Question

Hi guys! I am having a problem whereby when I click on a tree node(Folder), I want all the images contained in that folder to be displayed on a JPanel which I created. By the way, the tree and panel are added to a splitpane. Tree on the right, and panel on the left. I will really appreciate it if someone can assist. Thanks a lot in advance!!
Cheers,
Bolo

Answer 1

Hi,
You see this demo, it displays all the images of a selected folder in the tree in the right panel. You can customize the layout of the right panel to suit your need.
Regards,
Pratap
import java.awt.*;
import java.io.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.*;
import javax.swing.tree.*;
public class Frame1 extends JFrame implements TreeSelectionListener {
     JSplitPane jSplitPane1 = new JSplitPane();
     JScrollPane jScrollPane1 = new JScrollPane();
     JScrollPane jScrollPane2 = new JScrollPane();
     JTree tree = new JTree();
     JPanel panel = new JPanel();
     String dir = "d://images/";
     private static final FileSystemView fsv = FileSystemView.getFileSystemView();
     FlowLayout flowLayout1 = new FlowLayout();
     public Frame1() {
          try {
               jbInit();
               tree.setModel(new FileTreeModel(dir));
               tree.setCellRenderer(new FileCellRenderer());
               tree.addTreeSelectionListener(this);
          catch(Exception e) {
               e.printStackTrace();
     public void valueChanged(TreeSelectionEvent e) {
          panel.removeAll();
          if (e.getNewLeadSelectionPath() == null){
               panel.repaint();
               return;
          File node = (File)e.getNewLeadSelectionPath().getLastPathComponent();
          if (node.isFile()) {
               panel.repaint();
               return;
          File []images = node.listFiles();
          try {
               for (int i = 0; i < images.length; i++) {
                    String name = images.getName();
                    boolean image = name.endsWith(".gif") || name.endsWith(".jpg") || name.endsWith(".png");
                    if (!image) continue;
                    ImageIcon icon = new ImageIcon(images[i].toURL());
                    panel.add(new JLabel(icon));
               panel.revalidate();
          catch (Exception ex) {
               ex.printStackTrace();
     public static void main(String[] args) {
          Frame1 f = new Frame1();
          f.setSize(400,300);
          f.setLocation(200,200);
          f.show();
     private void jbInit() throws Exception {
          panel.setBackground(Color.white);
          panel.setLayout(flowLayout1);
          flowLayout1.setAlignment(FlowLayout.LEFT);
          this.getContentPane().add(jSplitPane1, BorderLayout.CENTER);
          jSplitPane1.add(jScrollPane1, JSplitPane.LEFT);
          jScrollPane1.getViewport().add(tree, null);
          jSplitPane1.add(jScrollPane2, JSplitPane.RIGHT);
          jScrollPane2.getViewport().add(panel, null);
     public class FileTreeModel extends DefaultTreeModel {
          File root;
          FileTreeModel(String dir)     {
               super(null);
               root = new File(dir);
          public Object getChild(Object parent, int index){
               File p = (File)parent;
               return p.listFiles()[index];
          public int getChildCount(Object parent)     {
               File p = (File)parent;
               return p.listFiles().length;
          public int getIndexOfChild(Object parent, Object child)     {
               File f [] = ((File)parent).listFiles();
               for (int i = 0; i < f.length; i++) {
                    if (f[i] == child) return i;
               return 0;
          public Object getRoot()     {
               return root;
          public boolean isLeaf(Object node){
               return ((File)node).isFile();
     public class FileCellRenderer extends DefaultTreeCellRenderer {
          public Component getTreeCellRendererComponent(JTree tree,
                                                       Object value,
                                                       boolean selected,
                                                       boolean expanded,
                                                       boolean leaf,
                                                       int row,
                                                       boolean hasFocus) {
               super.getTreeCellRendererComponent(tree, value,selected, expanded, leaf, row, hasFocus);
               File f = (File)value;
               setIcon(fsv.getSystemIcon(f));
               setText(f.getName());
               return this;