Jpeg encoder exception: Trying to make a thumbail from a jpeg image in a b

From:

lovaspillando <lovaspillando@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

Sun, 26 Aug 2007 13:36:15 -0700

Message-ID:

<1188160575.098097.227020@g4g2000hsf.googlegroups.com>

Hi:

I have a web application in asp.net 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
object.

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!

/*
* uploadPictures.java
*
* Created on August 19, 2007, 10:38 PM
*/

package servlets;

import java.awt.Graphics2D;
import java.io.*;
import java.net.*;
import javax.media.jai.JAI;

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;
import java.io.BufferedOutputStream;

import lovaspillando.business.Photo;

/**
*
* @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 {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();

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

        DiskFileUpload fu = new DiskFileUpload();
        fu.setSizeMax(10240*512);
        fu.setSizeThreshold(40960);
        fu.setRepositoryPath("/tmp");
        try {
            Iterator i = fu.parseRequest(request).iterator();
            FileItem actual = null;

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

//creating the bufferedImage from a JPEG stream
                InputStream in = new
ByteArrayInputStream(actual.get());
                JPEGImageDecoder decoder =
JPEGCodec.createJPEGDecoder(in);
                BufferedImage image = decoder.decodeAsBufferedImage();
                in.close();

//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 =
thumbImage.createGraphics();

graphics2D.setRenderingHint(java.awt.RenderingHints.KEY_INTERPOLATION,
java.awt.RenderingHints.VALUE_INTERPOLATION_BILINEAR);
                    graphics2D.drawImage(image, 0, 0, thumbWidth,
thumbHeight, null);

                    try {
                        ByteArrayOutputStream sout = new
ByteArrayOutputStream();
                        JPEGImageEncoder encoder =
JPEGCodec.createJPEGEncoder(sout);
                        JPEGEncodeParam param =
encoder.getDefaultJPEGEncodeParam(thumbImage);

                        int quality = Math.max(0, Math.min(650,
100));
                        param.setQuality((float)quality / 100.0f,
false);
                        encoder.setJPEGEncodeParam(param);
                        encoder.encode(thumbImage, param);
                        oPhoto.setBytesThumb(sout.toByteArray());
                        sout.close();
                    } catch (java.io.IOException ioe) {
                        ioe.printStackTrace();
                    }
                } // end if image width or height
                oPhoto.setBytesThumb(actual.get());
                oPhoto.setAlbumID(1);
                if(oPhoto.getBytesOriginal().length > 1) {
                    oPhoto.add();
                }
            }
        } catch (FileUploadException exception) {

        }
        out.close();
    }