void extractAcroForm(PDDocument pdf) throws IOException, SAXException {
// Thank you, Ben Litchfield, for org.apache.pdfbox.examples.fdf.PrintFields
// this code derives from Ben's code
PDDocumentCatalog catalog = pdf.getDocumentCatalog();
if (catalog == null) return;
PDAcroForm form = catalog.getAcroForm();
if (form == null) return;
// if it has xfa, try that.
// if it doesn't exist or there's an exception,
// go with traditional AcroForm
PDXFAResource pdxfa = form.getXFA();
if (pdxfa != null) {
// if successful, return
XFAExtractor xfaExtractor = new XFAExtractor();
try (InputStream is = new BufferedInputStream(new ByteArrayInputStream(pdxfa.getBytes()))) {
xfaExtractor.extract(is, xhtml, metadata, context);
return;
} catch (XMLStreamException | IOException e) {
// if there was an xml parse exception in xfa, try the AcroForm
}
}
@SuppressWarnings("rawtypes")
List fields = form.getFields();
if (fields == null) return;
@SuppressWarnings("rawtypes")
ListIterator itr = fields.listIterator();
if (itr == null) return;
xhtml.startElement("div", "class", "acroform");
xhtml.startElement("ol");
while (itr.hasNext()) {
Object obj = itr.next();
if (obj != null && obj instanceof PDField) {
processAcroField((PDField) obj, 0);
}
}
xhtml.endElement("ol");
xhtml.endElement("div");
}
public static PDSignatureField swapTextWithSignature(PDField box, List<PDField> fields) {
PDSignatureField sig = null;
try {
PDAcroForm acroForm;
acroForm = box.getAcroForm();
acroForm.getDictionary().setDirect(true);
PDSignature sigobj = new PDSignature();
sig = new PDSignatureField(acroForm);
sig.getDictionary().setDirect(true);
sig.setSignature(sigobj);
sig.getWidget().setPage(box.getWidget().getPage());
sig.setPartialName(box.getPartialName());
sig.setAlternateFieldName(box.getAlternateFieldName());
sig.getDictionary().setItem(COSName.RECT, box.getDictionary().getItem(COSName.RECT));
sig.getDictionary().setNeedToBeUpdate(true);
acroForm.getDictionary().setInt(COSName.SIG_FLAGS, 3);
acroForm.getDictionary().setNeedToBeUpdate(true);
fields.remove(box);
fields.add(sig);
} catch (IOException ioe) {
}
return sig;
}
