PDFBox : How can a PDAcroForm be flattened? [duplicate]

问题

I am using PDFBox library to populate PDF forms but I am not able to flatten them. I have already tried the following solutions:

 PDAcroForm acroForm = docCatalog.getAcroForm();
 PDField field = acroForm.getField( name );
 field.setReadonly(true); //Solution 1
 field.getDictionary().setInt("Ff",1);//Solution 2

But nothing seems to be working. Please suggest a solution for the same.

回答1:

PDFBOX 2.0.0 has a PDAcroForm.flatten() method

回答2:

As mentioned by Maruan, PDAcroForm.flatten() method may be used.

Although the fields might need some preprocessing and most importantly the nested field structure had to be traversed and DV and V checked for values.

In our case what worked was:

private static void flattenPDF(String src, String dst) throws IOException {
    PDDocument doc = PDDocument.load(new File(src));

    PDDocumentCatalog catalog = doc.getDocumentCatalog();
    PDAcroForm acroForm = catalog.getAcroForm();
    PDResources resources = new PDResources();
    acroForm.setDefaultResources(resources);

    List<PDField> fields = new ArrayList<>(acroForm.getFields());
    processFields(fields, resources);
    acroForm.flatten();

    doc.save(dst);
    doc.close();
}

private static void processFields(List<PDField> fields, PDResources resources) {
    fields.stream().forEach(f -> {
        f.setReadOnly(true);
        COSDictionary cosObject = f.getCOSObject();
        String value = cosObject.getString(COSName.DV) == null ?
                       cosObject.getString(COSName.V) : cosObject.getString(COSName.DV);
        System.out.println("Setting " + f.getFullyQualifiedName() + ": " + value);
        try {
            f.setValue(value);
        } catch (IOException e) {
            if (e.getMessage().matches("Could not find font: /.*")) {
                String fontName = e.getMessage().replaceAll("^[^/]*/", "");
                System.out.println("Adding fallback font for: " + fontName);
                resources.put(COSName.getPDFName(fontName), PDType1Font.HELVETICA);
                try {
                    f.setValue(value);
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            } else {
                e.printStackTrace();
            }
        }
        if (f instanceof PDNonTerminalField) {
            processFields(((PDNonTerminalField) f).getChildren(), resources);
        }
    });
}

来源：https://stackoverflow.com/questions/33383389/pdfbox-how-can-a-pdacroform-be-flattened

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