Re: Dynamic image generation servlet...

Johan Hahn <[email protected]> writes:

> Michael Burbidge wrote:
> [snip]
>> Note that the ImageServlet is registered to handle URI from the root
>> context of the form "/image". I would think then that the URI in the
>> the html snippet <img src='/image?name=imagename'> would get resolved
>> by dispatching to my ImageServlet. But it doesn't work.
>
> Try
>
>    <url-pattern>/image*</url-pattern>
>
> It should work without explanaition.

I don't think that's the problem.

   <url-patten>/image</url-pattern>

should match the url:

   http://somehost/image?something=xxx

I think the poster may have got the context path mucked up. The
request path he gave for calling his image directly was this:

   http://localhost:8080/demo/image

which indicates that the webapp is mapped to /demo on localhost.

But he said he was putting the following in his HTML page:

   <img src='/image?name=imagename'>

Well, that's never going to work because /image is not bound to
anything.

Instead he should use:

   <img src='/demo/image?name=imagename'/>

Or alternately use relative paths. If the HTML page is being served
from, for example /demo/index.html then his HTML could be this:

   <img src="image?name=imagename"/>



In a more advanced note: if relative paths are not possible then you
can still make your HTML position portable by generating the link to
the image in a servlet, eg:

   out.println(request.getContextPath() + "/image?name=imagename");


--
Nic Ferrier
http://www.tapsellferrier.co.uk

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