Creating thumbnail images and storing it as gif or jpg

Question

Hi all,
Iam new to this forum. I need a solution for the problem iam facing in building my site. I have groups and briefcase section in my site. I allow users to upload files and pictures.
When they upload pictures i need to create thumbnail for them and store them as gif or jpeg.
It would be very greatful if i can get an early answer.
Please let me know if there is any other forum where i can get better answer, if not here?
thnx

Answer 1

I found the following searching through the forum, under jpeg or thumbnail, a while back -- maybe you can use it:
import java.awt.Image;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.io.FileOutputStream;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
class Thumbnail {
public static void main(String[] args) {
createThumbnail(args[0], args[1], Integer.parseInt(args[2]));
* Reads an image in a file and creates a thumbnail in another file.
* @param orig The name of image file.
* @param thumb The name of thumbnail file. Will be created if necessary.
* @param maxDim The width and height of the thumbnail must
* be maxDim pixels or less.
public static void createThumbnail(String orig, String thumb, int maxDim) {
try {
// Get the image from a file.
Image inImage = new ImageIcon(orig).getImage();
// Determine the scale.
double scale = (double)maxDim/(double)inImage.getHeight(null);
if (inImage.getWidth(null) > inImage.getHeight(null)) {
scale = (double)maxDim/(double)inImage.getWidth(null);
// Determine size of new image. One of them
// should equal maxDim.
int scaledW = (int)(scale*inImage.getWidth(null));
int scaledH = (int)(scale*inImage.getHeight(null));
// Create an image buffer in which to paint on.
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(thumb);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
encoder.encode(outImage);
os.close();
} catch (IOException e) {
e.printStackTrace();
System.exit(0);
V.V.