You probably can't, not using iText. That's simply not a tool made for extracting layout information from a PDF. I'm not aware of an open source or free Java library you could use for this, but PDF-Renderer can display PDFs in Swing, so obviously it knows how to get at layout information.
Post by:autobot
Whip out those weird instruments of science and probe away! I think it's a tiny ad:
a bit of art, as a gift, the permaculture playing cards