Export to XFDF

Use FormExamples.exportXfdf(...) to write form field data as XFDF.

public static void exportXfdf(Path inputFile, Path outputFile) throws Exception {
    Form form = new Form();
    try (OutputStream outputStream = Files.newOutputStream(outputFile)) {
        form.bindPdf(inputFile.toString());
        form.exportXfdf(outputStream);
    } finally {
        form.close();
    }
}