This is useful in a Web-based Photo Gallery kind of application, where you need to automatically generate multiple sizes of the same image.
class ThumbnailGenerator { public void generateThumbnail (String origFile, String saveAsFileName){ Image image = new ImageIcon(origFile).getImage(); // Reduces to 1/4th size. int h = image.getHeight(null)/4; int w = image.getWidth(null)/4; reallyGenerateThumbnail(image, saveAsFileName, w, h); } public void generateThumbnail (String origFile, String saveAsFileName,int w, int h) { Image image = new ImageIcon(origFile).getImage(); reallyGenerateThumbnail(image, saveAsFileName, w, h); } public void reallyGenerateThumbnail(Image image, StringsaveAsFileName, int w, int h){ try{ BufferedImage buf = new BufferedImage(w, h,BufferedImage.TYPE_INT_RGB); Graphics g = buf.getGraphics(); g.drawImage(image, 0, 0, w, h, null); g.dispose(); OutputStream stream = new FileOutputStream(saveAsFileName); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(stream); encoder.encode(buf); stream.close(); System.exit(0); }catch(Exception e){ System.out.println(" Exception : You're evil ! You Broke My Code !!! "+ e.getMessage()); } } public static void main(String[] args) { if (( args.length < 2 ) || (args.length > 4)) { System.out.println(" usage .. ThumbnailGenerator "); System.exit(0); } ThumbnailGenerator th = new ThumbnailGenerator(); if ( args.length < 3) th.generateThumbnail(args[0], args[1]); else th.generateThumbnail(args[0], args[1], Integer.parseInt(args[2]),Integer.parseInt(args[3])); }} The code uses the com.sun.image.codec.jpeg package of JDK1.2
The program accepts a JPG or a GIF image file and generates a thumbnail of type JPEG. It also takes two additional/optional parameters
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