I have created an iPad apps that can draw PDF annotations. And the annotation data will be exported to XFDF format and store in my web system (implemented by Java and Spring).
Now I want to merge XFDF to an existing PDF file and generate an annotated PDF version when my users view the PDF in the web system. So that they can see the annotations they have drawn in the iPad apps.
So my question is how to merge the XFDF to PDF and create a new PDF file for users to view in my web system.
I have studied some libraries like iText. It seems I have to parse the XFDF and draw the annotations one by one programmatically. Any other suggestions? Thanks in advance.