Windows Explore

[basarajesh]

Hi,
I want Java code act like Windows Explore and can browse and access files in my windows system.
Thanks in advance
rajesh

[Avin Sinanan]

there are some errors in this.,, but if you work on it maybe you will get it out... sorry about the errors

<font size=2.5>
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 FileTree1 extends JFrame 
{
  public static final ImageIcon ICON_COMPUTER = 
    new ImageIcon("computer.gif");
  public static final ImageIcon ICON_DISK = 
    new ImageIcon("disk.gif");
  public static final ImageIcon ICON_FOLDER = 
    new ImageIcon("folder.gif");
  public static final ImageIcon ICON_EXPANDEDFOLDER = 
    new ImageIcon("expandedfolder.gif");
  protected JTree  m_tree;
  protected DefaultTreeModel m_model;
  protected JTextField m_display;
  public FileTree1() {
    super("Directories Tree");
    setSize(400, 300);
    DefaultMutableTreeNode top = new DefaultMutableTreeNode(
      new IconData(ICON_COMPUTER, null, "Computer"));
    DefaultMutableTreeNode node;
      File[] roots = File.listRoots();
    for (int k=0; k<roots.length; k++) {
      node = new DefaultMutableTreeNode(
        new IconData(ICON_DISK, 
        null, new FileNode(roots[k])));
      top.add(node);
      node.add( new DefaultMutableTreeNode(
      new Boolean(true)));
    }
    m_model = new DefaultTreeModel(top);
    m_tree = new JTree(m_model);
    m_tree.getSelectionModel().setSelectionMode(
      TreeSelectionModel.SINGLE_TREE_SELECTION);
    m_tree.putClientProperty("JTree.lineStyle", "Angled");
    TreeCellRenderer renderer = new IconCellRenderer();
    m_tree.setCellRenderer(renderer);
    m_tree.addTreeExpansionListener(new DirExpansionListener());
    m_tree.addTreeSelectionListener(new DirSelectionListener());
    m_tree.setShowsRootHandles(true); 
    m_tree.setEditable(false);
    JScrollPane s = new JScrollPane();
    s.getViewport().add(m_tree);
    getContentPane().add(s, BorderLayout.CENTER);
    m_display = new JTextField();
    m_display.setEditable(false);
    getContentPane().add(m_display, BorderLayout.NORTH);
    WindowListener wndCloser = new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    };
    addWindowListener(wndCloser);
        
    setVisible(true);
  }
  DefaultMutableTreeNode getTreeNode(TreePath path) {
    return (DefaultMutableTreeNode) (path.getLastPathComponent());
  }
  FileNode getFileNode(DefaultMutableTreeNode node) {
    if (node == null)
      return null;
    Object obj = node.getUserObject();
    if (obj instanceof IconData)
      obj = ((IconData)obj).getObject();
    if (obj instanceof FileNode)
      return (FileNode)obj;
    else
      return null;
  }
  // Make sure expansion is threaded and updating the tree model
  // only occurs within the event dispatching thread.
  class DirExpansionListener implements TreeExpansionListener
  {
    public void treeExpanded(TreeExpansionEvent event) {
      final DefaultMutableTreeNode node = getTreeNode(
        event.getPath());
      final FileNode fnode = getFileNode(node);
      Thread runner = new Thread() {
        public void run() {
          if (fnode != null && fnode.expand(node)) {
            Runnable runnable = new Runnable() {
              public void run() {
                m_model.reload(node);
              }
            };
            SwingUtilities.invokeLater(runnable);
          }
        }
      };
      runner.start();
    }
    public void treeCollapsed(TreeExpansionEvent event) {}
  }
  class DirSelectionListener implements TreeSelectionListener
  {
    public void valueChanged(TreeSelectionEvent event) {
      DefaultMutableTreeNode node = getTreeNode(event.getPath());
        FileNode fnode = getFileNode(node);
        if (fnode != null)
          m_display.setText(fnode.getFile().getAbsolutePath());
        else
          m_display.setText("");
    }
  }
  public static void main(String argv[]) { new FileTree1(); }
}
class IconCellRenderer extends JLabel implements TreeCellRenderer
{
  protected Color m_textSelectionColor;
  protected Color m_textNonSelectionColor;
  protected Color m_bkSelectionColor;
  protected Color m_bkNonSelectionColor;
  protected Color m_borderSelectionColor;
  protected boolean m_selected;
  public IconCellRenderer() {
    super();
    m_textSelectionColor = UIManager.getColor(
      "Tree.selectionForeground");
    m_textNonSelectionColor = UIManager.getColor(
      "Tree.textForeground");
    m_bkSelectionColor = UIManager.getColor(
      "Tree.selectionBackground");
    m_bkNonSelectionColor = UIManager.getColor(
      "Tree.textBackground");
    m_borderSelectionColor = UIManager.getColor(
      "Tree.selectionBorderColor");
    setOpaque(false);
  }
  public Component getTreeCellRendererComponent(JTree tree, 
   Object value, boolean sel, boolean expanded, boolean leaf, 
   int row, boolean hasFocus)        
  {
    DefaultMutableTreeNode node = (DefaultMutableTreeNode)value;
    Object obj = node.getUserObject();
    setText(obj.toString());
    if (obj instanceof Boolean)
      setText("Retrieving data...");
    if (obj instanceof IconData) {
      IconData idata = (IconData)obj;
      if (expanded)
        setIcon(idata.getExpandedIcon());
      else
        setIcon(idata.getIcon());
    }
    else
      setIcon(null);
    setFont(tree.getFont());
    setForeground(sel ? m_textSelectionColor : 
      m_textNonSelectionColor);
    setBackground(sel ? m_bkSelectionColor : 
      m_bkNonSelectionColor);
    m_selected = sel;
    return this;
  }
  public void paintComponent(Graphics g) {
    Color bColor = getBackground();
    Icon icon = getIcon();
    g.setColor(bColor);
    int offset = 0;
    if(icon != null && getText() != null) 
      offset = (icon.getIconWidth() + getIconTextGap());
    g.fillRect(offset, 0, getWidth() - 1 - offset,
      getHeight() - 1);
        
    if (m_selected) {
      g.setColor(m_borderSelectionColor);
      g.drawRect(offset, 0, getWidth()-1-offset, getHeight()-1);
    }
    super.paintComponent(g);
  }
}
class IconData
{
  protected Icon   m_icon;
  protected Icon   m_expandedIcon;
  protected Object m_data;
  public IconData(Icon icon, Object data) {
    m_icon = icon;
    m_expandedIcon = null;
    m_data = data;
  }
  public IconData(Icon icon, Icon expandedIcon, Object data) {
    m_icon = icon;
    m_expandedIcon = expandedIcon;
    m_data = data;
  }
  public Icon getIcon() { return m_icon; }
  public Icon getExpandedIcon() { 
    return m_expandedIcon!=null ? m_expandedIcon : m_icon;
  }
  public Object getObject() { return m_data; }
  public String toString() { return m_data.toString(); }
}
class FileNode
{
  protected File m_file;
  public FileNode(File file) { m_file = file; }
  public File getFile() { return m_file; }
  public String toString() {
    return m_file.getName().length() > 0 ? m_file.getName() :
      m_file.getPath();
  }
  public boolean expand(DefaultMutableTreeNode parent) {
    DefaultMutableTreeNode flag =
      (DefaultMutableTreeNode)parent.getFirstChild();
    if (flag==null)      // No flag
      return false;
    Object obj = flag.getUserObject();
    if (!(obj instanceof Boolean))
      return false;      // Already expanded
    parent.removeAllChildren();  // Remove Flag
    File[] files = listFiles();
    if (files == null)
      return true;
    Vector v = new Vector();
    for (int k=0; k<files.length; k++) {>
      File f = files[k];
      if (!(f.isDirectory()))
        continue;
      FileNode newNode = new FileNode(f);
           
      boolean isAdded = false;
      for (int i=0; i<v.size(); i++) {>
        FileNode nd = (FileNode)v.elementAt(i);
        if (newNode.compareTo(nd) < 0) {
          v.insertElementAt(newNode, i);
          isAdded = true;
          break;
        }
      }
      if (!isAdded)
      v.addElement(newNode);
    }
    for (int i=0; i<v.size(); i++) {>
      FileNode nd = (FileNode)v.elementAt(i);
      IconData idata = new IconData(FileTree1.ICON_FOLDER, 
        FileTree1.ICON_EXPANDEDFOLDER, nd);
      DefaultMutableTreeNode node = 
        new DefaultMutableTreeNode(idata);
      parent.add(node);
              
      if (nd.hasSubDirs())
        node.add(new DefaultMutableTreeNode( 
          new Boolean(true) ));
    }
    return true;
  }
  public boolean hasSubDirs() {
    File[] files = listFiles();
    if (files == null)
      return false;
    for (int k=0; k<files.length; k++) {>
      if (files[k].isDirectory())
        return true;
    }
    return false;
  }
    
  public int compareTo(FileNode toCompare) { 
    return  m_file.getName().compareToIgnoreCase(
      toCompare.m_file.getName() ); 
  }
  protected File[] listFiles() {
    if (!m_file.isDirectory())
      return null;
    try {
      return m_file.listFiles();
    }
    catch (Exception ex) {
      JOptionPane.showMessageDialog(null, 
        "Error reading directory "+m_file.getAbsolutePath(),
        "Warning", JOptionPane.WARNING_MESSAGE);
          return null;
    }
  }
}

(edited by Cindy to format code)
[This message has been edited by Cindy Glass (edited November 30, 2001).]

[Dave Vick]

basarajesh
Welcome to the Java Ranch, we hope you�ll enjoy visiting as a regular however, your name is not in keeping with our naming policy here at the ranch. Please re-register under an appropriate name as shown in the policy.
Thanks again and we hope to see you around the ranch!!


------------------
Dave
Sun Certified Programmer for the Java� 2 Platform