[Java]接受拖拽文件的窗口

 1 package 图形界面;  
 2   
 3 import javax.swing.*;
 4 import java.util.List;
 5 import java.awt.*;
 6 import java.awt.datatransfer.DataFlavor;
 7 import java.awt.datatransfer.UnsupportedFlavorException;
 8 import java.awt.dnd.*;
 9 import java.io.File;
10 import java.io.IOException;
11   
12 /** 
13  * @author Administrator 
14  */  
15 public class 拖拽文件 extends JFrame{  
16     
17     private static final long serialVersionUID = -3081282189290446349L;
18     
19     private JTextArea jta;
20     private JScrollPane jsp;
21 
22     
23     private void init_drop(){
24         
25         new DropTarget(this, DnDConstants.ACTION_COPY_OR_MOVE, new DropTargetAdapter() {
26             
27             @Override
28             public void drop(DropTargetDropEvent dtde) {
29                 
30                 if(dtde.isDataFlavorSupported(DataFlavor.javaFileListFlavor)){    //判断是否支持此文件的格式
31                     
32                     dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);    //接受该文件
33                     try {
34                         @SuppressWarnings("unchecked")
35                         List<File> list = (List<File>) dtde.getTransferable().getTransferData(DataFlavor.javaFileListFlavor);
36                         jta.setText(jta.getText()+list.get(list.size() - 1).getAbsolutePath() + "\r\n");
37                         
38                     } catch (UnsupportedFlavorException | IOException e) {
39                         e.printStackTrace();
40                     }
41                     
42                 }else{
43                     dtde.rejectDrop();            //拒绝该拖拽文件
44                 }
45                 
46             }
47             
48         });
49         
50     }
51     
52     private void init(){
53         
54         jta = new JTextArea();
55         jsp = new JScrollPane(jta);
56         
57         jsp.setBounds(30, 30, 200, 200);
58         jta.setForeground(Color.green);
59         jta.setRows(40);
60         
61     }
62     
63     public 拖拽文件(){
64         
65         this.init();
66         this.setTitle("拖拽文件测试");
67         this.setLayout(null);
68         this.add(jsp);
69         this.init_drop();
70         this.setBounds(420, 280, 300, 320);
71         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
72         this.setResizable(false);
73         this.setVisible(true);
74         
75     }
76     
77     public static void main(String args[]){
78         new 拖拽文件();
79     }
80     
81 }