Yes i found it here, but don't store the data. I write here what I've done:
if(!file.exists()){
Document document = new Document();
FileOutputStream os = new FileOutputStream("prova.pdf");
try {
writer = PdfWriter.getInstance(document, os);
document.open();
document.add(new
Paragraph("prova\nprova\nprova\nprova\nprova"));
document.addHeader("header", "prova header");
path = path.replace("tiff.tif", "signatureresize.bmp");
Image image1 = Image.getInstance(path);
image1.setAlignment(Element.ALIGN_RIGHT);
document.add(image1);
} catch (DocumentException | IOException e) {
e.printStackTrace();
}
document.close();
PdfName appName = new PdfName("MYAPP");
PdfName dataName = new PdfName("Hash");
DocumentPieceInfo dpi = new DocumentPieceInfo();
PdfReader reader = new PdfReader("prova.pdf");
dpi.addPieceInfo(os, reader, appName, dataName, new PdfString("prova"));
PdfStamper stamper = new PdfStamper(reader, os);
PdfObject obj = dpi.getPieceInfo(reader, appName, dataName);
System.out.println((obj==null)?"null":obj.toString());
PdfDictionary catalog = reader.getCatalog();
Set<PdfName> prova = catalog.getKeys();
System.out.println(prova.toString());
//output when i create the pdf and insert the dictionary is:
//prova
//[/Type, /PieceInfo, /Pages]
}else{
PdfName appName = new PdfName("MYAPP");
PdfName dataName = new PdfName("Hash");
DocumentPieceInfo dpi = new DocumentPieceInfo();
PdfReader reader = new PdfReader("prova.pdf");
PdfObject myData = dpi.getPieceInfo(reader, appName, dataName);
System.out.println((myData==null)?"null":myData.toString());
PdfDictionary catalog = reader.getCatalog();
Set<PdfName> prova = catalog.getKeys();
System.out.println(prova.toString());
//the output for this section is:
//null
//[/Type, /Pages]
}
Sorry, maybe I don't understand how use this class.
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