The form you share is a pure XFA form. XFA stands for the XML Forms Architecture.
Please read The Best iText Questions on StackOverflow and scroll to the section entitled "Interactive forms".
These are the first two questions of this section:
You are filling out the form as if it were based on AcroForm technology. That isn't supposed to work, is it? Your form is an XFA form!
Filling out an XFA form is explained in my book, in the XfaMovies example:
public void manipulatePdf(String src, String xml, String dest)
throws IOException, DocumentException {
PdfReader reader = new PdfReader(src);
PdfStamper stamper = new PdfStamper(reader,
new FileOutputStream(dest));
AcroFields form = stamper.getAcroFields();
XfaForm xfa = form.getXfa();
xfa.fillXfaForm(new FileInputStream(xml));
stamper.close();
reader.close();
}
In this case, src is a path to the original form, xml is a path to the XML data, and dest is the path of the filled out form.
If you want to read the data, you need the XfaMovie example:
This reads the full form (all the XFA):
public void readXfa(String src, String dest)
throws IOException, ParserConfigurationException, SAXException,
TransformerFactoryConfigurationError, TransformerException {
FileOutputStream os = new FileOutputStream(dest);
PdfReader reader = new PdfReader(src);
XfaForm xfa = new XfaForm(reader);
Document doc = xfa.getDomDocument();
Transformer tf = TransformerFactory.newInstance().newTransformer();
tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
tf.setOutputProperty(OutputKeys.INDENT, "yes");
tf.transform(new DOMSource(doc), new StreamResult(os));
reader.close();
}
If you only want the data, you need to examine the datasets node:
public void readData(String src, String dest)
throws IOException, ParserConfigurationException, SAXException,
TransformerFactoryConfigurationError, TransformerException {
FileOutputStream os = new FileOutputStream(dest);
PdfReader reader = new PdfReader(src);
XfaForm xfa = new XfaForm(reader);
Node node = xfa.getDatasetsNode();
NodeList list = node.getChildNodes();
for (int i = 0; i < list.getLength(); i++) {
if("data".equals(list.item(i).getLocalName())) {
node = list.item(i);
break;
}
}
list = node.getChildNodes();
for (int i = 0; i < list.getLength(); i++) {
if("movies".equals(list.item(i).getLocalName())) {
node = list.item(i);
break;
}
}
Transformer tf = TransformerFactory.newInstance().newTransformer();
tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
tf.setOutputProperty(OutputKeys.INDENT, "yes");
tf.transform(new DOMSource(node), new StreamResult(os));
reader.close();
}
Note that I don't understand why you think there are fields such as text_1, text_2 in the form. XFA fields are easy to recognize because the contain plenty of [] characters.
Also: from the screenshot below (taken with iText RUPS), it is clear that there are no such fields in the form:
The tools are there on the iText web site. The documentation is there. Please use it!
Update:
So... instead of accepting my comprehensive answer, you decided to post a comment asking me to do your work in your place by asking where I can find example code? in spite of the fact that I provided links to XfaMovie and XfaMovies.
Well, here are two new examples for you:
Of course: I don't understand Polish, so I didn't always fill out the correct values, but now at least you have no longer a reason to ask where I can find example code?
Update 2:
In an extra comment, you claim that you can't find the NIP number (number 10 in the form) anywhere in the data structure.
This means either that you haven't examined data.xml, or that you don't understand XML.
Allow me to show the relevant part of the XML that contains the NIP number:
<Deklaracja xmlns="http://crd.gov.pl/wzor/2014/12/05/1880/" xmlns:etd="http://crd.gov.pl/xml/schematy/dziedzinowe/mf/2011/06/21/eD/DefinicjeTypy/">
....
<Podmiot2 rola="Podatnik">
<etd:OsobaFizyczna>
<etd:NIP>0123456789</etd:NIP>
<etd:ImiePierwsze>JUST TRY</etd:ImiePierwsze>
<etd:Nazwisko>DUDE</etd:Nazwisko>
<etd:DataUrodzenia>2015-02-19</etd:DataUrodzenia>
</etd:OsobaFizyczna>
</Podmiot2>
...
</Deklaracja>
In other words, the field name you're looking for is probably something like this: Deklaracja[0].Podmiot2[0].OsobaFizyczna[0].NIP[0] (whatever these words may mean, I only know one Polish word: Podpis).
