获取包含数字签名的pdf页面的页面索引 [英] Get page index of pdf page containing digital signature

问题描述

我需要获取 PDF 文档中包含数字签名的页面的页面索引.如何使用 Apache PDFBox 获取它?

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?

推荐答案

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));
                }
            }
        }
    }
}

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