Combining XFA with PDFBox

问题:

I would like to fill a PDF form with the PDFBox java library. The PDF form is created with Adobe Live Designer, so it uses the XFA format.

I try to find resources about filling XFA PDF forms with PDFBox, but i haven't any luck so far. I saw that a PDAcroForm.setXFA method is available in the API, but i don't see how to use it.

Do you know if it is possible to fill a PDF Form with PDFBox ? If yes, is there anywhere a code sample or a tutorial to achieve this ? If no, what are the best alternatives to achieve this ?

回答1:

The question specifically identifies the PDFBox library in the subject; you do not need iText, the XFA manipulation can be done using the PDXFA object available in PDFBox 1.8.

Many thanks to Maruan Sahyoun for his great work on PDFBox + XFA.

This code only works when you remove all security on the PDDocument.
It also assumes the COS object in PDXFA is a COSStream. The simplistic example below reads the xml stream and writes it back into the PDF.

 PDDocument doc = PDDocument.load("filename");
 doc.setAllSecurityToBeRemoved(true);

 PDDocumentCatalog docCatalog = doc.getDocumentCatalog();
 PDAcroForm form = docCatalog.getAcroForm();

 PDXFA xfa = form.getXFA();
 COSBase cos = xfa.getCOSObject();
 COSStream coss = (COSStream) cos;
 InputStream cosin = coss.getUnfilteredStream();
 Document document = documentBuilder.parse(cosin);

 COSStream cosout = new COSStream(new RandomAccessBuffer());
 OutputStream out = cosout.createUnfilteredStream();

 TransformerFactory tFactory = TransformerFactory.newInstance();
 Transformer transformer = tFactory.newTransformer();
 DOMSource source = new DOMSource(xmlDoc);
 StreamResult result = new StreamResult(out);
 transformer.transform(source, result);

 PDXFA xfaout = new PDXFA(cosout);
 form.setXFA(xfaout);

回答2:

This it the best I was able to manage in the time I was allocated on the problem. I get the pdf saved (in Life Cycle) as optimized (I'm not the one doing the pdf). This is the PDF openning part, XML duplication and then saving:

    PDDocument document = PDDocument.load(fileInputStream);
    fileInputStream.close();
    document.setAllSecurityToBeRemoved(true);

    Map<String, String> values = new HashMap<String, String>();
    values.put("variable_name", "value");


    setFields(document, values); // see code below

    PDAcroForm form = document.getDocumentCatalog().getAcroForm();
    Document documentXML = form.getXFA().getDocument();

    NodeList dataElements = documentXML.getElementsByTagName("xfa:data");
    if (dataElements != null) {
        for (int i = 0; i < dataElements.getLength(); i++) {
            setXFAFields(dataElements.item(i), values);
        }
    }

    COSStream cosout = new COSStream(new RandomAccessBuffer());

    TransformerFactory.newInstance().newTransformer()
            .transform(new DOMSource(documentXML), new StreamResult(cosout.createUnfilteredStream()));

    form.setXFA(new PDXFA(cosout));

    FileOutputStream fios = new FileOutputStream(new File(docOut + ".pdf"));
    document.save(fios);
    document.close();
    try {
        fios.flush();
    } finally {
        fios.close();
    }

then the methods who set values for fields. I set both the XFA and the AcroForm:

public void setXFAFields(Node pNode, Map<String, String> values) throws IOException {
    if (values.containsKey(pNode.getNodeName())) {
        pNode.setTextContent(values.get(pNode.getNodeName()));
    } else {
        NodeList childNodes = pNode.getChildNodes();
        if (childNodes != null) {
            for (int i = 0; i < childNodes.getLength(); i++) {
                setXFAFields(childNodes.item(i), values);
            }
        }
    }
}

public void setFields(PDDocument pdfDocument, Map<String, String> values) throws IOException {

    @SuppressWarnings("unchecked")
    List<PDField> fields = pdfDocument.getDocumentCatalog().getAcroForm().getFields();
    for (PDField pdField : fields) {
        setFields(pdField, values);
    }
}

private void setFields(PDField field, Map<String, String> values) throws IOException {
    List<COSObjectable> kids = field.getKids();
    if (kids != null) {
        for (COSObjectable pdfObj : kids) {
            if (pdfObj instanceof PDField) {
                setFields((PDField) pdfObj, values);
            }
        }
    } else {
        // remove the [0] from the name to match values in our map
        String partialName = field.getPartialName().replaceAll("\\[\\d\\]", "");
        if (!(field instanceof PDSignatureField) && values.containsKey(partialName)) {
            field.setValue(values.get(partialName));
        }
    }
}

This work, but not for all "kind" of PDF life Cycle produce, some got a warning message about "extended fonction" not enabled anymore but still work. The optimize version is the only one I found who don't prompt message when openned after being filled.

I fill the XFA and the Acroform otherwise it don't work in all viewer.

回答3:

I'm not familiar with pdfbox but you can do this with iText (http://itextpdf.com/) once you get access to the XFA (XML) DOM.

回答4:

AcroForm is for PDF with static fields. If PDF have xfa forms you can use itext (Java) or itextsharp ( .net) to Populate your Data . Only problem with XFA Forms are they cannot be Flatten with itext only way to Flatten I found is using bullzip or similar pdf creator to open that xfa pdf created with itext and pass it through bullzip which will spit out flatten pdf version. Hope this will give u some ideas.

Below code just a rough idea how xfa is filled.

XfaForm xfa = pdfFormFields.Xfa;
dynamic bytes = Encoding.UTF8.GetBytes("<?xml version=\"1.0\" encoding=\"UTF-8\"?> <form1> <staticform>" + "\r\n<barcode>" + barcode + "</barcode></staticform> <flowForm><Extra>" + Extra + "</Extra></flowForm> </form1>");
MemoryStream ms = new MemoryStream(bytes);
pdfStamper.AcroFields.Xfa.FillXfaForm(ms);

you can now use the xfa pdf you created and print through bullzip

const string Printer_Name = "Bullzip PDF Printer";

                    PdfSettings pdfSettings = new PdfSettings();
                    pdfSettings.PrinterName = Printer_Name;
                    pdfSettings.SetValue("Output", flatten_pdf);
                    pdfSettings.SetValue("ShowPDF", "no");
                    pdfSettings.SetValue("ShowSettings", "never");
                    pdfSettings.SetValue("ShowSaveAS", "never");
                    pdfSettings.SetValue("ShowProgress", "no");
                    pdfSettings.SetValue("ShowProgressFinished", "no");
                    pdfSettings.SetValue("ConfirmOverwrite", "no");
                    pdfSettings.WriteSettings(PdfSettingsFileType.RunOnce);
                    PdfUtil.PrintFile(xfa_pdffile, Printer_Name);

output file will be flatten pdf..