package com; import java.awt.*; import java.awt.datatransfer.DataFlavor; import java.awt.dnd.DnDConstants; import java.awt.dnd.DropTarget; import java.awt.dnd.DropTargetAdapter; import java.awt.dnd.DropTargetDropEvent; import java.io.File; import java.util.List; import javax.swing.*; /**  * 最简单的Java拖拽代码示例  * @author 刘显安  * 2013年1月24日  */ public class DragTest extends JFrame {     JPanel panel;//要接受拖拽的面板     public DragTest()     {         panel = new JPanel();         panel.setBackground(Color.YELLOW);         getContentPane().add(panel, BorderLayout.CENTER);         setSize(500, 200);         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         setLocation(400, 200);         setTitle("最简单的拖拽示例：拖拽文件到下面（20130124）");         drag();//启用拖拽     }     public static void main(String[] args) throws Exception     {         UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");//设置皮肤         new DragTest().setVisible(true);;     }     public void drag()//定义的拖拽方法     {         //panel表示要接受拖拽的控件         new DropTarget(panel, DnDConstants.ACTION_COPY_OR_MOVE, new DropTargetAdapter()         {             @Override             public void drop(DropTargetDropEvent dtde)//重写适配器的drop方法             {                 try                 {                     if (dtde.isDataFlavorSupported(DataFlavor.javaFileListFlavor))//如果拖入的文件格式受支持                     {                         dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);//接收拖拽来的数据                         List<File> list =  (List<File>) (dtde.getTransferable().getTransferData(DataFlavor.javaFileListFlavor));                         String temp="";                         for(File file:list)                             temp+=file.getAbsolutePath()+";\n";                         JOptionPane.showMessageDialog(null, temp);                         dtde.dropComplete(true);//指示拖拽操作已完成                     }                     else                     {                         dtde.rejectDrop();//否则拒绝拖拽来的数据                     }                 }                 catch (Exception e)                 {                     e.printStackTrace();                 }             }         });     } }