How to add total page number on every page with iText?

Question

How to add the total page number on every page with iText?

Answer 1

From a quick web search to remind myself of this; take a look at

Example

The relevant methods are onEndPage() to produce the "X" and onCloseDocument() to produce the "Y" once you hit the end of the document.

Answer 2

You need to process the output from a PdfWriter to a bytestream first with a dummy page count.

Then create a PdfReader from that bytestream, calling PdfReader.getNumberOfPages to get the actual page count.

Then recreate the PDF output, knowing what the page count will be, changing the footer accordingly.

See here for an example.

It's messy, I know, but there's no easy way to know the page count until after you've generated the PDF, hence the two-pass approach.