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  1 import java.awt.BorderLayout;
  2 import java.awt.event.ActionEvent;
  3 import java.awt.event.ActionListener;
  4 import java.awt.image.BufferedImage;
  5 import java.io.IOException;
  6 import java.net.MalformedURLException;
  7 import java.net.URL;
  8 import java.util.Iterator;
  9
10 import javax.imageio.ImageIO;
11 import javax.imageio.ImageReader;
12 import javax.imageio.event.IIOReadProgressListener;
13 import javax.imageio.stream.ImageInputStream;
14 import javax.swing.*;
15
16 public class IIOProgressTest
17 {
18     public static void main(String[] args)
19     {
20         try {
21             UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
22         } catch (Exception e) {
23             e.printStackTrace();
24         }
25
26         final JLabel imageLabel = new JLabel();
27         JScrollPane scrollPane = new JScrollPane(imageLabel);
28         final JButton startBtn = new JButton("Load Image");
29         final JProgressBar progressBar = new JProgressBar();
30         progressBar.setVisible(false);
31         JPanel p = new JPanel(new BorderLayout(5, 5));
32         p.add(startBtn, BorderLayout.WEST);
33         p.add(progressBar, BorderLayout.CENTER);
34
35         final IIOReadProgressListener progressListener = new IIOReadProgressListener() {
36             public void imageStarted(ImageReader source, int imageIndex)
37             {
38                 SwingUtilities.invokeLater(new Runnable()
39                 {
40                     public void run()
41                     {
42                         startBtn.setEnabled(false);
43                         progressBar.setValue(0);
44                         progressBar.setVisible(true);
45                         invalidate();
46
47                     }
48                 });
49             }
50             public void imageProgress(ImageReader source, final float percentageDone)
51             {
52                 SwingUtilities.invokeLater(new Runnable()
53                 {
54                     public void run()
55                     {
56                         System.out.println("percentageDone" + percentageDone);
57                         progressBar.setValue((int) (percentageDone));
58                     }
59                 });
60             }
61             public void imageComplete(ImageReader source)
62             {
63                 SwingUtilities.invokeLater(new Runnable()
64                 {
65                     public void run()
66                     {
67                         startBtn.setEnabled(true);
68                         progressBar.setValue(100);
69                         progressBar.setVisible(false);
70                     }
71                 });
72             }
73
74             public void sequenceStarted(ImageReader source, int minIndex) {}
75             public void sequenceComplete(ImageReader source) {}
76             public void thumbnailStarted(ImageReader source, int imageIndex, int thumbnailIndex) {}
77             public void thumbnailProgress(ImageReader source, float percentageDone) {}
78             public void thumbnailComplete(ImageReader source) {}
79             public void readAborted(ImageReader source) {}
80         };
81
82         startBtn.addActionListener(new ActionListener()
83         {
84             public void actionPerformed(ActionEvent e)
85             {
86                 final String urlStr = JOptionPane.showInputDialog(
87                         SwingUtilities.getWindowAncestor(startBtn), "Input image URL");
88                 if (urlStr == null) {
89                     return;
90                 }
91
92                 new Thread() {
93                     public void run()
94                     {
95                         try {
96                             URL url = new URL(urlStr);
97                             ImageInputStream iis = ImageIO.createImageInputStream(url.openStream());
98                             Iterator iter = ImageIO.getImageReaders(iis);
99                             if (iter.hasNext()) {
100                                 ImageReader reader = (ImageReader) iter.next();
101                                 reader.setInput(iis);
102                                 reader.addIIOReadProgressListener(progressListener);
103                                 BufferedImage image = reader.read(reader.getMinIndex());
104                                 final ImageIcon icon = new ImageIcon(image);
105
106                                 SwingUtilities.invokeLater(new Runnable()
107                                 {
108                                     public void run()
109                                     {
110                                         imageLabel.setIcon(icon);
111                                         imageLabel.revalidate();
112                                     }
113                                 });
114                             }
115                         } catch (MalformedURLException e) {
116                             e.printStackTrace();
117                         } catch (IOException e) {
118                             e.printStackTrace();
119                         }
120                     }
121                 }.start();
122             }
123         });
124
125         JFrame f = new JFrame("IIOProgressTest");
126         f.getContentPane().setLayout(new BorderLayout(5, 5));
127         f.getContentPane().add(scrollPane, BorderLayout.CENTER);
128         f.getContentPane().add(p, BorderLayout.SOUTH);
129         f.setSize(800, 600);
130         f.setLocationRelativeTo(null);
131         f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
132         f.setVisible(true);
133     }
134 }
135