Hi,
You can find this explained in chapeter 6 of "Java Servlet Programming by
Jason Hunter", published by O'REILLY.
Regds,
Gokul
----- Original Message -----
From: "Pier P. Fumagalli" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, December 20, 2000 11:37 AM
Subject: Re: [SERVLET-INTEREST] Servlet question
> Gabriel Ciuloaica <[EMAIL PROTECTED]> wrote:
> >
> > Where can I find an example of creating run-time images from a servlet,
or
> > what are the principles ?
>
> I don't know of any example of servlets doing that, but I worked a little
> bit on dynamic images generation.
>
> First of all you need to make sure you have a proper rendering environment
> (in Windows it's not a problem, but in Unix your JVM must be able to
connect
> to the Xwindows server to be able to start the AWT).
>
> In JDK 1.2 there's the BufferedImage class, check it out, as it permits to
> get a "virtual" image, or better, a image that resides on memory but is
not
> printed on the screen.
>
> Draw on the BufferedImage as you would do with any AWT component, and then
> use something to translate the BufferedImage into a stream of bytes.
>
> If JPEG is fine for you, it all comes in JDK 1.2 as an extension (check
out
> the documentation of JDK, there's a part detailing a JPEG encoder). If you
> want to use GIFs, I suggest using the ACME gif package (but you might end
up
> with some patent infringement problems), or for PNG use the JAI (Java
> Advanced Imaging API).
>
> Usually, all those packages can write the image out to an OutputStream,
and
> from your servlet, simply specify your ServletOutputStream, of course
> setting the appropriate content-type for the image type you want to
> generate.
>
> Pier
>
> --
> Pier Fumagalli - Sun Microsystems Inc. -
<mailto:[EMAIL PROTECTED]>
> --------------------------------------------------------------------------
--
>
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