Java - Editar un PDF con Java

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.*;

import com.itextpdf.text.DocumentException;

import com.itextpdf.text.pdf.*;

import javax.imageio.ImageIO;

public class PdfEditor {

    public static void main(String[] args) throws IOException, DocumentException {

        /* example inspired from "iText in action" (2006), chapter 2 */

        // input PDF

        PdfReader reader = new PdfReader("C:/temp/dummy.pdf");

        // output PDF

        PdfStamper stamper = new PdfStamper(reader,

                new FileOutputStream("C:/temp/dummy_modified.pdf"));

        //loop on pages (1-based)

        for (int i = 1; i <= reader.getNumberOfPages(); i++) {

            // get object for writing over the existing content;

            // you can also use getUnderContent for writing in the bottom layer

            PdfContentByte pdfContentByte = stamper.getOverContent(i);

            // pon la imagen. Juega con las coordinadas ...

            float x = reader.getPageSize(i).getWidth() - 400;

            float y = reader.getPageSize(i).getHeight() - 200;

            com.itextpdf.text.Image image = com.itextpdf.text.Image.getInstance(getImage(), null);

            image.setAbsolutePosition(x, y);

            pdfContentByte.addImage(image);

        }

        stamper.close();

    }

    private static Image getImage() {

        File file = new File("c:/temp/panda.jpg");

        BufferedImage image = null;

        try {

            image = ImageIO.read(file);

        } catch (IOException e) {

            e.printStackTrace();

        }

        System.out.println("done");

        return image;

    }

}