Jpeg encoder exception: Trying to make a thumbail from a jpeg image in a byte[]

 lovaspillando <>
Sat, 25 Aug 2007 16:21:54 -0700

I have a web application in wich I am rewriting to Java. Is
about uploading pictures online. Web system upload perfectly
pictures, but in original size. I would like to upload too a thumbail
version of the big picture. For that, I am using Jpegencoder from
sun, and seems I am doing something bad, coz when I am trying to do
that I get a exception: "nof a jpeg file: start " and so on...

I get the file data from a fileupload (apache commons fileupload), and
since I get the byte array of each picture I save it into a bussiness

The complete code is in here, just in case someone of you could help
me. I am getting extressed coz dont know what coulb be wrong, if
somone of you could help it will be more than great!. Thank you for
your help!

 * Created on August 19, 2007, 10:38 PM

package servlets;

import java.awt.Graphics2D;

import javax.servlet.*;
import javax.servlet.http.*;

import java.util.Iterator;
import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;

import java.awt.Image;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageDecoder;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import java.awt.Graphics2D;


 * @author lovaspillando
 * @version
public class uploadPictures extends HttpServlet {

    /** Processes requests for both HTTP <code>GET</code> and
<code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
    protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
    throws ServletException, IOException {
        PrintWriter out = response.getWriter();

        boolean isMultiPart;
        isMultiPart = ServletFileUpload.isMultipartContent(request);

        DiskFileUpload fu = new DiskFileUpload();
        try {
            Iterator i = fu.parseRequest(request).iterator();
            FileItem actual = null;

            while (i.hasNext()){
                actual = (FileItem);
                String fname = actual.getName();
                Photo oPhoto = new Photo();
                oPhoto.setDesPhoto("sticked title");

//creating the bufferedImage from a JPEG stream
                InputStream in = new
                JPEGImageDecoder decoder =
                BufferedImage image = decoder.decodeAsBufferedImage();

//preparing thumbail numbers
                int thumbWidth = 150;
                int thumbHeight = 150;
                double thumbRatio = (double)thumbWidth /
(double)thumbHeight; //ratio for the thumbail

// obtain the picture width and height
                int imageWidth = image.getWidth(null);
                int imageHeight = image.getHeight(null);

//it will works if the size of image is bigger than thumbail details
                if (imageWidth > 150 || imageHeight > 150) {
                    double imageRatio = (double)imageWidth /
(double)imageHeight; //ratio in the original image
                    if (thumbRatio < imageRatio) {
                        thumbHeight = (int)(thumbWidth / imageRatio);
                    } else {
                        thumbWidth = (int)(thumbHeight * imageRatio);

// scale it to the new size on-the-fly
                    BufferedImage thumbImage = new
BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);

                    Graphics2D graphics2D =
                    graphics2D.drawImage(image, 0, 0, thumbWidth,
thumbHeight, null);

                    try {
                        ByteArrayOutputStream sout = new
                        JPEGImageEncoder encoder =
                        JPEGEncodeParam param =

                        int quality = Math.max(0, Math.min(650,
                        param.setQuality((float)quality / 100.0f,
                        encoder.encode(thumbImage, param);
                    } catch ( ioe) {
                } // end if image width or height
                if(oPhoto.getBytesOriginal().length > 1) {
        } catch (FileUploadException exception) {


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