Greetings!
I've been using iText for 2+ years for a forms generation application.
Recently I have started using PdfStamper to simplify the effort of
overlaying data onto PDF page forms for the following use case (mixed
pseudo-code ... sorry):
Document document = localOpen(); // document assumed to be valid
PdfWriter writer = PdfWriter.getInstance(document, os); // os assumed to be
valid
document.open();
PdfContentByte cb = writer.getDirectContent();
PdfReader formReader = new PdfReader(bytes_from_PDF_resource);
For 10,000 recipients ...
document.newPage();
ByteArrayOutputStream baos = new
ByteArrayOutputStrea(some_reasonable_size);
PdfStamper stamper = new PdfStamper(formReader, baos);
For each valid field ...
setField(with_appropriate_value);
End-For
stamper.setFormFlattening(true);
stamper.close();
PdfReader readerTemplate = new PdfReader(baos.toByteArray());
cb.addTemplate(writer.getImportedPage(readerTemplate, 1);
writer.freeReader(readerTemplate); // ----->>> Adding this line prevented
out of memory exceptions for iterations of this size
End-For
doccument.close();
The above works great, with one exception ... it creates an enormous PDF
file (approx. 200mb). The following code produces a much smaller PDF file
(approx. 15mb), but is not nearly as elegant as above:
Document document = localOpen(); // document assumed to be valid
PdfWriter writer = PdfWriter.getInstance(document, os); // os assumed to be
valid
document.open();
PdfContentByte cb = writer.getDirectContent();
PdfReader formReader = new PdfReader(bytes_from_PDF_resource);
// Code that determines AcroForm field coordinates omitted
PdfImportedPage imported = writer.getImportedPage(formReader, 1);
For 10,000 recipients ...
document.newPage();
cb.addTemplate(imported);
For each valid field ...
Use PdfContentByte text writing methods for each rectangle from the
AcroForm above
End-For
End-For
doccument.close();
A lot of detail presented, a lot omitted. Hopefully this tells enough of
the story to invite your suggestions or comments.
Cheers,
Bruce
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