I'm trying to develop a portlet that will display a dynamically-generated
graph of some data, customized using the user's settings. I have a Struts
web-app that will do the whole deal, and I'm now trying to portlet-enable
it, but I'm so new to Jetspeed I'm not sure I'm heading the correct
direction. I assume I would define my portlet as a VelocityPortlet, with
a simple Velocity template consisting of just an <img> tag. My problem is
knowing what to put as the image source.
I tried searching the mailing lists directly and via Google for "dynamic
image", "image generation", "image portlet", "mime portlet", and other
variations. None of which found anyone else talking about dynamic image
generation from within Jetspeed.
I see a few ways to approach the problem:
(1) deploy the generation servlet outside of Jetspeed with a convoluted
URL that encodes all the settings chosen and returns the image data
(2) edit Jetspeed's "web.xml" to add the generation servlet into the
context under some mapping where my servlet and Jetspeed can share an
HttpSession for IPC
(3) generate random files to litter the filesystem and a cron job to clean
them
up after they get old enough
My preferred solution is a <something> in Jetspeed that can return
MIME-encoded
images inline without using the filesystem; that is, a URL the browser can
fetch that returns content-type=image/png but invokes a class within
Jetspeed.
Is there anything like this out of the box?
+Mitchell
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