Thumbnail images, mysql, byte[ ] - need some help

Question

I'm using the tech tip found on sun's site for "Creating Image Thumbnails" at http://java.sun.com/developer/TechTips/1999/tt1021.html#tip1
I've looked over the code, and now I'm trying to mesh some of the code from that example with the code for my servlet program.
My servlet takes a jpeg image submitted from an html form on a web page (all of which I'm testing on my localhost Tomcat server) and uploads it into my mysql database into a column of type BLOB. I do not upload a reference to a FILE, rather, I upload the BYTES that make up that image.
I wanted to make the images into a thumbnail size PRIOR to uploading them into the db.
My code snippet for my servlet that just uploads the file without modifying its size is:
boolean isPart = FileUpload.isMultipartContent(req);
     if(isPart)
DiskFileUpload upload = new DiskFileUpload(); // upload a file from the local disk.
List items = upload.parseRequest(req); // Create a list of all uploaded files.
     Iterator it = items.iterator(); // Create an iterator to iterate through the list.
          while(it.hasNext())
     FileItem item = (FileItem)it.next();
     File f = new File(item1.getName()); // Create a FileItem object to access the file.
byte[] bytes = new byte[(int)f.length()];
     FileInputStream fs = new FileInputStream(f);
     BufferedInputStream bis = new BufferedInputStream(fs);
     bis.read(bytes);
PreparedStatement stmt = conn.prepareStatement("UPDATE car SET Image1 = ? where Account=1");
     stmt.setBytes(1, bytes);
     int i = stmt1.executeUpdate();
Here is the code from the Tech Tip:
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);
I will be changing the following line right off the bat:
1 ) changing the argument passed to:
Image inImage = new ImageIcon(bytes);
I'm passing it my array
bytes
which I created in my upload servlet, it's holding the image.
I don't want to write the newly thumbnail sized image to a JPEG stream as it is coded at the end of the program from Sun.
Instead, I want to read the newly sized image into a
byte[ ]
array and then continue with my servlet program, and place the image into the db. I have a column of type BLOB waiting for it:)
Does anyone know how to do this?

Answer 1

Yes I have done this, do not have the code to hand, its in a real mess anyway, one of those things I got working and never got round to using...
I based my code on some found here
http://forum.java.sun.com/thread.jspa?forumID=20&threadID=505366
Note, the above link shows how to add a watermark to an image as well.
It does not show how to resize it (I was originally after the watermark bit) But I got it to resize by messing with the variables used to draw out the image.
If you search the forums you will find this a common problem, but I was very impressed with the code posted in the above link, one of my favorites!