img src using portlet

[vahid...@gmail.com]

hi all, I'm not sure if I should describe my problem here, sorry if
not.
I'm developing a java photo gallery project using
hibernate/spring/portlet/jsp... system.
my project is supposed to be added to a portal(Uportal).
I want to get my jsp images from portlet,
I retrieve the images from database but don't know how to send them to
my jsp to be used in <img src=.../> tag.
in servlet mode we used to stream the image to jsp using an individual
servlet (e.g ImgServlet), but in portlet architecture I have just one
portlet managing everything.
I wonder if I should use the same portlet, or use a servlet.if the
latter is my solution what is the relation of my portlet and the
servlet.
one more question for me is how to handle download feature using this
structure.
I would really appreciate if any one could help me anyway.
regards.