This sample replaces one image in a PDF file with a new one.

ReplaceImage.java

/*
 * Copyright Datalogics, Inc. 2015
 */

package pdfjt.cookbook.imaging;

import com.adobe.internal.io.ByteReader;
import com.adobe.internal.io.InputStreamByteReader;
import com.adobe.pdfjt.pdf.document.PDFDocument;
import com.adobe.pdfjt.pdf.document.PDFOpenOptions;
import com.adobe.pdfjt.pdf.document.PDFResources;
import com.adobe.pdfjt.pdf.graphics.xobject.PDFXObject;
import com.adobe.pdfjt.pdf.graphics.xobject.PDFXObjectImage;
import com.adobe.pdfjt.pdf.graphics.xobject.PDFXObjectMap;
import com.adobe.pdfjt.pdf.page.PDFPage;
import com.adobe.pdfjt.services.imageconversion.ImageManager;
import com.datalogics.pdf.document.DocumentHelper;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;

/**
 * This sample replaces one image in a PDF file with a new one.
 */
public class ReplaceImage {

    private static final String inputPDFURL = "http://dev.datalogics.com/cookbook/imaging/ReplaceImage_Input.pdf";
    private static final String inputImageURL = "http://dev.datalogics.com/cookbook/imaging/bird-2.jpg";
    private static final String outputDir = "cookbook/Imaging/output/";

    static public void main(String[] args) throws Exception {
            // First read in the PDF file and get the first page so we can add a
            // Stamp to it.
            URLConnection connection = new URL(inputPDFURL).openConnection();
            connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11");
            connection.connect();
            InputStream fis = connection.getInputStream();        
            ByteReader byteReader = new InputStreamByteReader(fis);
            PDFDocument pdfDocument = PDFDocument.newInstance(byteReader, PDFOpenOptions.newInstance());

            PDFPage pdfPage = pdfDocument.requirePages().getPage(0);

            // Read in the image file as a BufferedImage.
            ImageReader reader = null;
            Iterator<ImageReader> imageReaders = ImageIO.getImageReadersByFormatName("JPG");
            if (imageReaders.hasNext()) {
                reader = imageReaders.next();
            } else {
                System.out.println("A JPG Reader isn't available");
                System.exit(0);
            }

            URLConnection connection2 = new URL(inputImageURL).openConnection();
            connection2.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11");
            connection2.connect();  
            reader.setInput(ImageIO.createImageInputStream(connection2.getInputStream()));
            BufferedImage bufferedImage = reader.read(0);
            /*
             * Use the ImageManager class to convert the BufferedImage into a
             * PDF XObject we can add to the page.
             */
            PDFXObjectImage newImage = ImageManager.getPDFImage(bufferedImage, pdfDocument);
            /*
             * The sample input file has only one image so we don't really need
             * to go looking for it. We know it's the first one.
             */            
            PDFResources pdfResources = pdfPage.getResources();
            PDFXObjectMap pdfXObjectMap = pdfResources.getXObjectMap();
            PDFXObject pdfXObject = pdfXObjectMap.get(pdfXObjectMap.keySet().iterator().next());
            /*
             * Now we can use the InputStream from the new image's XObject to
             * replace the original image.
             */            
            pdfXObject.setStreamData(newImage.getImageStreamData());
            // Save and close
            DocumentHelper.saveFullAndClose(pdfDocument, outputDir+"Bird.pdf"); 

            // Save the file.
            System.out.println("Done!");
    }
}