Adding form fields to a pdf

Hi,

I need to add a hidden form field and a HtmlPostField on each page of an 
existing pdf document (contains form fields).

From what I read in the documentation, I need to use the PdfStamper Class:
I guess my code will look like: (I need help on *add my forms here!!!*)
Thanks for your help
--
Vincent

     PdfReader pdf_reader;
     FileOutputStream pdf_os;
     pdf_reader = new PdfReader(pdf_file);
     pdf_os     = new FileOutputStream(dest_file);
     PdfStamper stamper = new PdfStamper(pdf_reader, pdf_os);

     int nb_pages = pdf_reader.getNumberOfPages();
     for (int i=1;i<=nb_pages;i++) {
       PdfContentByte cb = stamper.getOverContent(i);
       //*add my forms here!!!*

     }



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