图片查看器

 1 import java.awt.*;
 2 import java.io.*;
 3 import java.awt.event.ActionEvent;
 4 import java.awt.event.ActionListener;
 5 import javax.swing.*;
 6 
 7 public class ViewImage {
 8     public static void main(String args[])
 9     {
10         EventQueue.invokeLater(new Runnable()
11         {
12             public void run()
13             {
14                 JFrame frame = new ViewFrame();
15                 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
16                 frame.setVisible(true);
17             }
18         });
19     }
20 }
21 
22 class ViewFrame extends JFrame
23 {
24     /**
25      * 
26      */
27     private static final long serialVersionUID = 1L;
28     
29     public ViewFrame()
30     {
31         setTitle("Image View");
32         setSize(s_width,s_height);
33         label = new JLabel();
34         add(label);
35         chooser = new JFileChooser();
36         chooser.setCurrentDirectory(new File("."));
37         JMenuBar menubar = new JMenuBar();
38         setJMenuBar(menubar);
39         JMenu menu = new JMenu("File");
40         menubar.add(menu);
41         
42         JMenuItem openItem = new JMenuItem("Open");
43         menu.add(openItem);
44         openItem.addActionListener(new ActionListener()
45         {
46             public void actionPerformed(ActionEvent event)
47             {
48                 int result = chooser.showOpenDialog(null);
49                 if(result == JFileChooser.APPROVE_OPTION)
50                 {
51                     String name = chooser.getSelectedFile().getPath();
52                     label.setIcon(new ImageIcon(name));
53                 }
54             }
55         });
56         JMenuItem exitItem = new JMenuItem("Exit");
57         menu.add(exitItem);
58         exitItem.addActionListener(new ActionListener()
59         {
60             public void actionPerformed(ActionEvent event)
61             {
62                 System.exit(0);
63             }
64         });
65     }
66     
67     private JLabel label;
68     private JFileChooser chooser;
69     private static final int s_width = 300;
70     private static final int s_height = 400;
71 }