Re: How do I send program generated Images to my users?

On 26 oct, 16:18, Greg Dougherty <dougherty.greg...@mayo.edu> wrote:
> > - Generate the image with a servlet on the fly (return the appropriate mime
> > type and the image) or (if the images are small)
>
> Great idea.  HOW DO I DO THAT?
>
> Sorry for the shouting, but I'm already generating the things on the
> fly.  If I knew how to return them other than as a file, I'd already
> be doing that.
>
> I've got a GWT client and a GWT Servlet.  The GWT Servlet has an image
> sitting in its memory.  I want to get that image to the client.  If
> you can give me sample code, point me to sample code, or point me to a
> well documented Java function, that would be great, and you would have
> my full appreciation.
>
> Telling me to "do X' is pointless, if you don't give me some way of
> figuring out how to DO that X.  Because if I knew how to do it, I
> would have already done it, and not wasted everyone's time with these
> questions.

The thing is: instead of calling your servlet through GWT-RPC or
whatever (anything implemented above XMLHttpRequest) to generate the
image; "generate" the call through a new Image(), passing the
"arguments" in the URL.
Your servlet will then be a bare HttpServlet (no GWT involved, just
implement de doGet method) and you'd send the image back using the
HttpServletResponse's OutputStream (after setting the
HttpServletResponse's content-type to the appropriate value, for
instance "image/png").
To get the arguments on the server-side, if you passed them in the
query string, then HttpServletRequest#getParameter will work
seamlessly.

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