jTree

Programação Java
#1

Gostaria de saber como carregar dados de um bd para uma jTree.

#2

da uma olhada deve te ajudar

[code]import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.io.File;
import java.util.Collections;
import java.util.Vector;

import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;

/**

  • Display a file system in a JTree view

  • @version $Id: FileTree.java,v 1.9 2004/02/23 03:39:22 ian Exp $

  • @author Ian Darwin
    /
    public class FileTree extends JPanel {
    /    * Construct a FileTree */
    public FileTree(File dir) {
    setLayout(new BorderLayout());

    // Make a tree list with all the nodes, and make it a JTree
    JTree tree = new JTree(addNodes(null, dir));

    // Add a listener
    tree.addTreeSelectionListener(new TreeSelectionListener() {
    public void valueChanged(TreeSelectionEvent e) {
    DefaultMutableTreeNode node = (DefaultMutableTreeNode) e
    .getPath().getLastPathComponent();
    System.out.println("You selected " + node);
    }
    });

    // Lastly, put the JTree into a JScrollPane.
    JScrollPane scrollpane = new JScrollPane();
    scrollpane.getViewport().add(tree);
    add(BorderLayout.CENTER, scrollpane);
    }

/** Add nodes from under "dir" into curTop. Highly recursive. */
DefaultMutableTreeNode addNodes(DefaultMutableTreeNode curTop, File dir) {
String curPath = dir.getPath();
DefaultMutableTreeNode curDir = new DefaultMutableTreeNode(curPath);
if (curTop != null) { // should only be null at root
curTop.add(curDir);
}
Vector ol = new Vector();
String[] tmp = dir.list();
for (int i = 0; i < tmp.length; i++)
ol.addElement(tmp[i]);
Collections.sort(ol, String.CASE_INSENSITIVE_ORDER);
File f;
Vector files = new Vector();
// Make two passes, one for Dirs and one for Files. This is #1.
for (int i = 0; i < ol.size(); i++) {
String thisObject = (String) ol.elementAt(i);
String newPath;
if (curPath.equals("."))
newPath = thisObject;
else
newPath = curPath + File.separator + thisObject;
if ((f = new File(newPath)).isDirectory())
addNodes(curDir, f);
else
files.addElement(thisObject);
}
// Pass two: for files.
for (int fnum = 0; fnum < files.size(); fnum++)
curDir.add(new DefaultMutableTreeNode(files.elementAt(fnum)));
return curDir;
}

public Dimension getMinimumSize() {
return new Dimension(200, 400);
}

public Dimension getPreferredSize() {
return new Dimension(200, 400);
}

/** Main: make a Frame, add a FileTree */
public static void main(String[] av) {

JFrame frame = new JFrame&#40;&quot;FileTree&quot;&#41;;
frame.setForeground&#40;Color.black&#41;;
frame.setBackground&#40;Color.lightGray&#41;;
Container cp = frame.getContentPane&#40;&#41;;

if &#40;av.length == 0&#41; &#123;
  cp.add&#40;new FileTree&#40;new File&#40;&quot;c&#58;\\Publico&quot;&#41;&#41;&#41;;
&#125; else &#123;
  cp.setLayout&#40;new BoxLayout&#40;cp, BoxLayout.X_AXIS&#41;&#41;;
  for &#40;int i = 0; i &lt; av.length; i++&#41;
    cp.add&#40;new FileTree&#40;new File&#40;av&#91;i&#93;&#41;&#41;&#41;;
&#125;

frame.pack&#40;&#41;;
frame.setVisible&#40;true&#41;;
frame.setDefaultCloseOperation&#40;JFrame.EXIT_ON_CLOSE&#41;;

}
}
[/code]

#3