I send GIFs using servlet and this may differ for JPEGs.
In the GIF case:
Since I already have the image as byte array I just set the content type to
image/gif and send them to the servlet's output stream. Without any
manipulation or involvment of graphics functions.
In the HTML you go like this:
<img src="/servlet/ImageServlet?ID=lalala">
dave
Ross Wayland wrote:
> Hi,
>
> I'm having a problem displaying jpeg images via a servlet...
>
> Context:
> The jpeg images are being passed from another java application
> in the form of a byte[]. The function of the servlet is to grab
> the byte[] and display it on a dynamically created html page.
>
> I initially tried using the jpeg encoder from www.acme.com. Their GIF
> encoder works great but I was unable to get their JPEG encoder to work
> so I turned to the jpeg encoder built into JDK 1.2 which seems to require
> transforming Image to BufferedImage.
>
> The code snippet below produces an image on the html page with the correct
> dimensions, but the image is solid black. Can anyone provide some pointers
> as to where I went astray or suggest a better way of handling the
> transformation from byte[] to BufferedImage? thanks in advance.
>
> Ross
>
> .
> .
> .
> //dataStream is a byte[] with the image data
> response.setContentType("image/jpeg");
> ServletOutputStream out = response.getOutputStream();
> BufferedImage bi = draw(dataStream);
> encode(bi,out);
> .
> .
> .
>
> public static BufferedImage draw(byte[] dataStream) {
> BufferedImage bi =
> new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB);
> Graphics2D g2d = bi.createGraphics();
> Image image = Toolkit.getDefaultToolkit().createImage(dataStream);
> g2d.drawImage(image,null,null);
> g2d.dispose();
> return(bi);
> }//end draw
>
> public static void encode(BufferedImage bi, OutputStream out)
> throws IOException {
> JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
> JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
> param.setQuality(1.0f,false);
> encoder.encode(bi,param);
> }//end encode
>
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Instinet Corporation
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