How to automatically fill a batch of data to the PDF form

How to automatically fill a batch of data (well structured) to the PDF form? There are lots data items, so automatically do this by a program/script is required.

If you know a little bit of Python, you can achieve this in Python with some libraries. Check How can I auto-populate a PDF form in Django/Python.

Tools you will need:
fdfgen https://pypi.python.org/pypi/fdfgen/ and
PDFtk http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/