Java JTree_2

package com.han;

import java.awt.BorderLayout;
import java.util.Enumeration;

import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeSelectionModel;

/**
 * 处理节点选中事件
 * 
 * @author HAN
 * 
 */
public class JTree_2 extends JFrame {
	/**
	 * 
	 */
	private static final long serialVersionUID = -4187076423981270641L;

	public JTree_2() {
		DefaultMutableTreeNode root = new DefaultMutableTreeNode("本地磁盘（D：）");
		DefaultMutableTreeNode nodePicture = new DefaultMutableTreeNode("图片");
		root.add(nodePicture);
		root.add(new DefaultMutableTreeNode("音乐"));
		nodePicture.add(new DefaultMutableTreeNode("千山——世博园旅游"));
		DefaultMutableTreeNode nodeSecond = new DefaultMutableTreeNode(
				"凤凰山——大鹿岛旅游");
		nodePicture.add(nodeSecond);
		nodeSecond.add(new DefaultMutableTreeNode("大浪淘沙.gif", false));
		nodeSecond.add(new DefaultMutableTreeNode("辽阔的大海.jpg", false));

		DefaultTreeModel defaultTreeModel = new DefaultTreeModel(root, true);
		final JTree defaultTree = new JTree(defaultTreeModel);
		getContentPane().add(defaultTree, BorderLayout.WEST);

		// expand initially all nodes
		@SuppressWarnings("rawtypes")
		Enumeration enumeration = root.preorderEnumeration();
		while (enumeration.hasMoreElements()) {
			DefaultMutableTreeNode node = (DefaultMutableTreeNode) enumeration
					.nextElement();
			defaultTree.expandPath(new TreePath(node.getPath()));
		}

		// add the tree selection listener, and print the selection path to
		// screen
		TreeSelectionModel treeSelectionModel = defaultTree.getSelectionModel(); // get
																					// the
																					// selection
																					// model
		treeSelectionModel
				.setSelectionMode(TreeSelectionModel.CONTIGUOUS_TREE_SELECTION);
		defaultTree.addTreeSelectionListener(new TreeSelectionListener() {
			@Override
			public void valueChanged(TreeSelectionEvent e) {
				if (!defaultTree.isSelectionEmpty()) {
					TreePath[] selectionPaths = defaultTree.getSelectionPaths();
					for (int i = 0; i < selectionPaths.length; i++) {
						TreePath treePath = selectionPaths[i];
						Object[] path = treePath.getPath();
						for (int j = 0; j < path.length; j++) {
							DefaultMutableTreeNode node = (DefaultMutableTreeNode) path[j];
							System.out.print(node.getUserObject()
									+ ((j == path.length - 1) ? "" : "-->"));
						}
						System.out.println();
					}
					System.out.println();
				}
			}
		});
	}

	public static void main(String[] args) {
		JTree_2 instance = new JTree_2();
		instance.setVisible(true);
		instance.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		instance.pack();
	}
}