How to produce image map with java servlet?

Hello,
I know the way to produce an image map from a static image. And I also know how to use ServeltOutputStream to generate an image on the fly. But I don't know how to use the dynamically generated image to produce an image map. Can anyone help me? Thanks a lot!
Louis

The database is a BioSQL database and I am using Biojava "BioSQLSequenceDB class" to access it. Sorry I don't really know the schema of the BioSQL
The easiest example is to ignore the database totally.
At the moment, I just want to do the folloing thing:
1. Use HTML form to retireve the height and length of a rectangle that user specified
2. draw the rectangle on the fly
3. make the rectangle a hyper link to an HTML documet, which represents "Hello world" to the user
Could you show me how to do it please?
Thanks very much.
Louis

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==========
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