Generating dynamic HTML?

This may well be a trivial question; if so I hope you will forgive my ignorance.

I am writing a application for J2EE, and I have a need for generating "dynamic HTML", by which I mean that I have to present data (typically in a table) which comes in a variety of forms; eg. I don't know how many columns or which datatypes there are when I write the code. Thus I will have to create the HTML on the fly, which I could simply do, I suppose, but first I'd like to hear whether there is a standar Java toolset for this sort of thing?