Get page index of pdf page containing digital signature [closed]

问题

Closed. This question needs to be more focused. It is not currently accepting answers.

---

Want to improve this question? Update the question so it focuses on one problem only by editing this post.

Closed 2 years ago.

Improve this question

I have the requirement to get the page index of the page containing a digital signature in a pdf document. How can I get it using Apache PDFBox?

回答1:

try (PDDocument doc = PDDocument.load(new File("....")))
{
    PDPageTree pageTree = doc.getPages();
    PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
    for (PDField field : acroForm.getFieldTree())  // null check omitted
    {
        if (field instanceof PDSignatureField)
        {
            PDSignatureField sigField = (PDSignatureField) field;
            for (PDAnnotationWidget widget : sigField.getWidgets())
            {
                PDPage page = widget.getPage();
                if (page != null)
                {
                    System.out.println("Signature on page " + (pageTree.indexOf(widget.getPage()) + 1));
                }
            }
        }
    }
}

来源：https://stackoverflow.com/questions/51530482/get-page-index-of-pdf-page-containing-digital-signature