java swing的拖放例子

我从Java.sun.com和javaworld.com上的例子改过来的一棵文件系统树,支持拖放,CTRL+V复制文件

import java.awt.AlphaComposite;

import java.awt.Component;

import java.awt.Graphics2D;

import java.awt.Point;

import java.awt.Rectangle;

import java.awt.Toolkit;

import java.awt.datatransfer.DataFlavor;

import java.awt.datatransfer.StringSelection;

import java.awt.datatransfer.Transferable;

import java.awt.datatransfer.UnsupportedFlavorException;

import java.awt.dnd.DnDConstants;

import java.awt.dnd.DragGestureEvent;

import java.awt.dnd.DragGestureListener;

import java.awt.dnd.DragSource;

import java.awt.dnd.DragSourceDragEvent;

import java.awt.dnd.DragSourceDropEvent;

import java.awt.dnd.DragSourceEvent;

import java.awt.dnd.DragSourceListener;

import java.awt.dnd.DropTarget;

import java.awt.dnd.DropTargetDragEvent;

import java.awt.dnd.DropTargetDropEvent;

import java.awt.dnd.DropTargetEvent;

import java.awt.dnd.DropTargetListener;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.awt.geom.AffineTransform;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Iterator;

import java.util.List;

import javax.swing.Icon;

import javax.swing.JLabel;

import javax.swing.JTree;

import javax.swing.Timer;

import javax.swing.event.TreeEXPansionEvent;

import javax.swing.event.TreeExpansionListener;

import javax.swing.filechooser.FileSystemView;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeCellRenderer;

import javax.swing.tree.DefaultTreeModel;

import javax.swing.tree.TreePath;

class DragTree extends JTree implements DragGestureListener,

DragSourceListener, DropTargetListener {

BufferedImage GhostImage;

private Rectangle2D ghostRect = new Rectangle2D.Float();

private Point ptOffset = new Point();

private Point lastPoint = new Point();

private TreePath lastPath;

private Timer hoverTimer;

FileNode sourceNode;

public DragTree() {

DragSource dragSource = DragSource.getDefaultDragSource();

dragSource.createDefaultDragGestureRecognizer(this, // component where