Load, create, and save image as thumbnail

Question

Duke Dollars to earn ... :)
Hi,
I want to create a very simple jsp page where I can upload an image through the filechooser and display the uploaded image on the page. When hitting a save button I want to save the image as a thumbnail on the webserver.
If anyone has suggestions on smooth, clever code that will do this for me, it will be highly appreciated. And answers with code will be awarded.
Regards
Malin

Answer 1

see if this can help you out...
import com.sun.image.codec.jpeg.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
public class Thumbnail {
public static void main(String[] args) throws Exception {
if (args.length != 5) {
System.err.println("Usage: java Thumbnail inputFileName " +
"outputFileName width height quality"); //quality 0-100
System.exit(1);
// load image from INFILE
Image image = Toolkit.getDefaultToolkit().getImage(args[0]);
MediaTracker mediaTracker = new MediaTracker(new Frame());
mediaTracker.addImage(image, 0);
mediaTracker.waitForID(0);
// determine thumbnail size from WIDTH and HEIGHT
int thumbWidth = Integer.parseInt(args[2]);
int thumbHeight = Integer.parseInt(args[3]);
double thumbRatio = (double)thumbWidth / (double)thumbHeight;
int imageWidth = image.getWidth(null);
int imageHeight = image.getHeight(null);
double imageRatio = (double)imageWidth / (double)imageHeight;
if (thumbRatio < imageRatio) {
thumbHeight = (int)(thumbWidth / imageRatio);
} else {
thumbWidth = (int)(thumbHeight * imageRatio);
// draw original image to thumbnail image object and
// scale it to the new size on-the-fly
BufferedImage thumbImage = new BufferedImage(thumbWidth,
thumbHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = thumbImage.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
// save thumbnail image to OUTFILE
BufferedOutputStream out = new BufferedOutputStream(new
FileOutputStream(args[1]));
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.
getDefaultJPEGEncodeParam(thumbImage);
int quality = Integer.parseInt(args[4]);
quality = Math.max(0, Math.min(quality, 100));
param.setQuality((float)quality / 100.0f, false);
encoder.setJPEGEncodeParam(param);
encoder.encode(thumbImage);
System.out.println("Done.");
System.exit(0);