Using iText7 to add a table in a specific page of an existing PDF

Question

I'm trying to add a dynamically created table to a dynamically created existing PDF. I want to "append" the table to a specific position on the last page of the existing PDF.

My current code is based on the answer given by Uladzimir Asipchuk on this thread, it goes like this:

public byte[] completePDF(byte[] originalPDF){

    ByteArrayInputStream is = new ByteArrayInputStream(originalPDF);
    ByteArrayOutputStream os = new ByteArrayOutputStream();

    PdfDocument pdfDoc;
    try {
        pdfDoc = new PdfDocument(new PdfReader(is), new PdfWriter(os));
        final Document doc = new Document(pdfDoc);
         //FAKE TABLE TO TEST
        Table table = new Table(UnitValue.createPercentArray(new float[] {10f,90f}));

        for (int i = 0; i<150; i++){

            table.addCell(new String(new Integer(i).toString()));
            table.addCell("FAKE DATA");
        }

        doc.setRenderer(new DocumentRenderer(doc) {
            @Override
            protected LayoutArea updateCurrentArea(LayoutResult overflowResult) {

                int lastPage = doc.getPdfDocument().getNumberOfPages();

                LayoutArea area = super.updateCurrentArea(overflowResult);

                if (area.getPageNumber() == lastPage) {
                    PdfDocumentContentParser parser = new PdfDocumentContentParser(doc.getPdfDocument());
                    TextMarginFinder finder = parser.processContent(lastPage, new TextMarginFinder());
                    area.getBBox().decreaseHeight(finder.getTextRectangle().getHeight() + 30);
                }
                return area;
            }
        });

        doc.add(table);

        doc.close();
    } catch (Exception e) {
        return null;
    }

    return os.toByteArray();

}

This code does almost what I want, (new pages are added based on the table size, and the table position on the last page starts after the text of that page), but I don't know of to force the table to start getting drawn on the last page.

Is is possible? Any help would be greatly appreciated.

Thanks!

Please move the solution from your question into an actual answer which you can eventually accept. This causes your question to appear as answered. — mkl, May 04 '18 at 16:00

score 3 · Accepted Answer · answered May 05 '18 at 17:54

Found the solution by myself, I was really close to it. I'll post it just in case someone has the same problem:

if (area.getPageNumber() == lastPage) {
    PdfDocumentContentParser parser = new PdfDocumentContentParser(doc.getPdfDocument());
    TextMarginFinder finder = parser.processContent(lastPage, new TextMarginFinder());
    area.getBBox().decreaseHeight(finder.getTextRectangle().getHeight() + 30);
} else if (area.getPageNumber() < lastPage){
    area.getBBox().decreaseHeight(doc.getPdfDocument().getDefaultPageSize().getHeight());
}
return area;

This way the table gets "appended" just after the end of the text of the last page of the PDF.

Using iText7 to add a table in a specific page of an existing PDF

1 Answers1