Java Tutorial/2D Graphics/ImageReader

Show Image with ImageReader

   <source lang="java">

import java.awt.Graphics; import java.awt.Panel; import java.awt.image.BufferedImage; import java.io.FileInputStream; import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; import javax.swing.JFrame; public class Main extends Panel{

 private BufferedImage images[];
 private int imageIndex = 0;
 public Main(String filename) throws Exception{
     FileInputStream fin = new FileInputStream(filename);
     String suffix = filename.substring(filename.lastIndexOf(".") + 1);
     System.out.println("suf " + suffix);
     Iterator readers = ImageIO.getImageReadersBySuffix(suffix);
     ImageReader imageReader = (ImageReader) readers.next();
     ImageInputStream iis = ImageIO.createImageInputStream(fin);
     imageReader.setInput(iis, false);
     int num = imageReader.getNumImages(true);
     images = new BufferedImage[num];
     for (int i = 0; i < num; ++i) {
       images[i] = imageReader.read(i);
     }
     fin.close();
 }
 public void paint(Graphics g) {
   if (images == null)
     return;
   g.drawImage(images[imageIndex], 0, 0, null);
   imageIndex = (imageIndex + 1) % images.length;
 }
 static public void main(String args[]) throws Exception {
   JFrame frame = new JFrame("ShowImageIR.java");
   Panel panel = new Main(args[0]);
   frame.getContentPane().add(panel);
   frame.setSize(400, 400);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setVisible(true);
 }

}</source>