Creating Thumnail

Question

Hi Friends ...
I am creating thumnail by this code ...
public static void createThumbnail(String original, String thumbnail, int maxDim , String format) {
try {
Image inImage = new ImageIcon(
original).getImage();
     double scale = (double)maxDim/(
     double)inImage.getHeight(null);
if (inImage.getWidth(
null) > inImage.getHeight(null)) {
scale = (double)maxDim/(
double)inImage.getWidth(null);
int scaledW = (int)(
scale*inImage.getWidth(null));
int scaledH = (int)(
scale*inImage.getHeight(null));
BufferedImage outImage =
new BufferedImage(scaledW, scaledH,
BufferedImage.TYPE_INT_RGB);
// Set the scale.
AffineTransform tx =
new AffineTransform();
// If the image is smaller than
//the desired image size,
// don't bother scaling.
if (scale < 1.0d) {
tx.scale(scale, scale);
// Paint image.
Graphics2D g2d =
outImage.createGraphics();
g2d.drawImage(inImage, tx, null);
g2d.dispose();
// JPEG-encode the image
//and write to file.
OutputStream os =
new FileOutputStream(thumbnail);
/*JPEGImageEncoder encoder =
JPEGCodec.createJPEGEncoder(os);
encoder.encode(outImage);*/
ImageIO.write(outImage , format , os);
os.flush();
os.close();
os = null;
}catch(Exception e){
System.out.println("Exception in Creating Thumbnail :" +e);
PROBLEMS :::
The problem is that when ever i am updating my original image ..i can;t see the updated thumnail copy of it ..this code always return copy of thumnail that i have created first time during invoketion of code..and subsequent time it return only that copy (First Copy) irespect of original image.update...can any body guess what is happing ..with this ..
Please give me replay as soon as possible..
Thanks ADvance..
Parthiv Patel

Answer 1

If I understand your problem, it's that after the first time you call this method, it always makes a thumbnail of the original image instead of using the one on disk? If that's the problem it's because the ImageIcon uses Toolkit.getImage, which caches requests for images in a file to return the same image. You need to get the image like this:Image image = Toolkit.getDefaultToolkit().createImage(original);
if (image == null) return;
MediaTracker mt = new MediaTracker(new Component());
mt.addImage(image, 0);
try { mt.waitForAll(); }
catch (Exception e) {}