java實現拖拽示例

Swing中實現拖拽功能，代碼很簡單，都有注釋，自己看，運行效果如下圖：

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.*;

/**?* 最簡單的Java拖拽代碼示例?* @author 劉顯安?* 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("最簡單的拖拽示例：拖拽文件到下面(20130124)");??????? drag();//啟用拖拽??? }??? public static void main(String[] args) throws Exception??? {??????? UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");//設置皮膚??????? new DragTest().setVisible(true);;??? }??? public void drag()//定義的拖拽方法??? {??????? //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)//重寫適配器的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);//接收拖拽來的數據??????????????????????? List list =? (List) (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();//否則拒絕拖拽來的數據??????????????????? }??????????????? }??????????????? catch (Exception e)??????????????? {??????????????????? e.printStackTrace();??????????????? }??????????? }??????? });??? }}

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