Outputting JPEG using servlets

Question

hi
Im trying to output the JPEG created by the StockGraphProducer class i found on Javaworld to a webpage using a servlet output stream.
The original code used a file output stream i have included a snippet of it below. I have also included my servlet where i have tried to amend it to render JPEG to the webpage but im not usre abotu it or what bits i need to change in the StockGraphProducer
I woudl be very grateful if someone could take a quick look at this .
thanks
public class StockGraphProducer implements ImageProducer
  private static int ImageWidth = 300;
  private static int ImageHeight = 300;
  private static int VertInset = 25;
  private static int HorzInset = 25;
  private static int HatchLength = 10;
   *  Request the producer create an image
   *  @param stream stream to write image into
   *  @return image type
// i want to try and use a servlet output stream to send the JPEG to the user insteadof outputstream.
public String createImage(Outputstream stream) throws IOException
    plottedPrices = new Point2D.Double[5];
    int prices[] =  {105, 100, 97, 93, 93};
    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(stream);
//do i remove the stream paaremter from createiamge and above function???
    BufferedImage bi = new BufferedImage(ImageWidth + 10,
                                         ImageHeight,
                                         BufferedImage.TYPE_BYTE_INDEXED);
    graphics = bi.createGraphics();
    graphics.setColor(Color.white);
    graphics.fillRect(0, 0, bi.getWidth(), bi.getHeight());
    graphics.setColor(Color.red);
    createVerticalAxis();
    createHorizontalAxis();
    graphics.setColor(Color.green);
    plotPrices(prices);
    encoder.encode(bi);
    return "image/jpg";
public final class GraphRenderer extends HttpServlet
     public void doGet(HttpServletRequest request,
                           HttpServletResponse response)
       throws IOException, ServletException
          HttpSession session = request.getSession(true);
               response.setContentType("image/jpeg");
          ServletOutputStream sos= response.getOutputStream();
  //the original code
   /* try
       FileOutputStream f = new FileOutputStream("stockgraph.jpg");
       StockGraphProducer producer = new StockGraphProducer();
       producer.createImage(f);
       f.close();
    catch (Exception e)
      e.printStackTrace();
//i want to try and use a servlet output stream so that the JPEG is sent to the webpage     i tried the following butim not sure about it. I got rid of the outputstream parameter from StockGraphProducer and left it empty and tried .
          try
               StockGraphProducer producer = new StockGraphProducer();
                      producer.createImage();
               //i dont think i need this part.      
               /*Dimension size= producer.getPreferredSize();
               BufferedImage image = new BufferedImage((int)size.getWidth(),                (int)size.getHeight(), BufferedImage.TYPE_INT_RGB);
               Graphics g= image.createGraphics();
               gp.paint(g);*/
               // Send back image i dont think this is correct
               JPEGImageEncoder encoder= JPEGCodec.createJPEGEncoder(sos);
               JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image);
               param.setQuality(1.0f, false);
               encoder.setJPEGEncodeParam(param);
               encoder.encode(image);
          catch(Exception ex)
          {

Answer 1

Hi,
I need to create a program where I get an Image from DB and then display it in Browser using servlets.
I was looking at the StockGraphProducer, but it seems the code is not fully posted.
I would greatly appreciate anyone who has this StockGraphProducer program would email me or post it.
Thanks in advance.
my email address is [email protected]
Again Thanks