//.......
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();
//....

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);
    }
}

Image inImage = new ImageIcon(bytes);

bytes

byte[ ]