import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import com.lowagie.text.Document;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.xml.xmp.XmpWriter;
public class MainClass {
public static void main(String[] args) throws Exception {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream("2.pdf"));
document.open();
document.add(new Paragraph("Hello World"));
document.close();
PdfReader reader = new PdfReader("2.pdf");
System.out.println("Tampered? " + reader.isTampered());
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("2.pdf"));
HashMap info = reader.getInfo();
info.put("Subject", "subject");
info.put("Author", "author");
info.put("Keywords", "keywords");
info.put("Title", "title");
info.put("Creator", "creator");
stamper.setMoreInfo(info);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
XmpWriter xmp = new XmpWriter(baos, info);
xmp.close();
stamper.setXmpMetadata(baos.toByteArray());
stamper.close();
}
}