PDF file to image(.png) conversion using java

Required jars:

•   itext-1.1.4.jar
•  itext-rups-2.1.3.jar
•  jdtaus-editor-client-application-1.0-beta-10.jar
•  PDFRenderer.jar

package com.liferay;

import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFPage;

import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Transparency;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import javax.swing.*;
import javax.imageio.*;
import java.awt.image.*;

public class ImageMain {

	public static void setup() throws IOException {

	    //load a pdf from a byte buffer
	    File file = new File("E:/01_Installing-liferay-bundle.pdf");
	    RandomAccessFile raf = new RandomAccessFile(file, "r");
	    FileChannel channel = raf.getChannel();
	    ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
	    PDFFile pdffile = new PDFFile(buf);

	    int numPgs = pdffile.getNumPages();

	   for (int i=0; i<numPgs; i++)
	   {
	   // draw the first page to an image
	    PDFPage page = pdffile.getPage(i);

	    //get the width and height for the doc at the default zoom
	    Rectangle rect = new Rectangle(0,0,
	            (int)page.getBBox().getWidth(),
	            (int)page.getBBox().getHeight());

	    //generate the image
	    Image img = page.getImage(
	            rect.width, rect.height, //width & height
	            rect, // clip rect
	            null, // null for the ImageObserver
	            true, // fill background with white
	            true  // block until drawing is done
	            );

	    //save it as a file
	    BufferedImage bImg = toBufferedImage( img );
	    File yourImageFile = new File("E:/workspace/rnd/javarnd/page_" + i + ".png");
	    ImageIO.write( bImg,"png",yourImageFile);
	    }
	}

	// This method returns a buffered image with the contents of an image
	public static BufferedImage toBufferedImage(Image image) {
	    if (image instanceof BufferedImage) {
	        return (BufferedImage)image;
	    }

	    // This code ensures that all the pixels in the image are loaded
	    image = new ImageIcon(image).getImage();

	    // Create a buffered image with a format that's compatible with the screen
	    BufferedImage bimage = null;
	    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
	    try {
	        // Determine the type of transparency of the new buffered image
	        int transparency = Transparency.OPAQUE;

	        // Create the buffered image
	        GraphicsDevice gs = ge.getDefaultScreenDevice();
	        GraphicsConfiguration gc = gs.getDefaultConfiguration();
	        bimage = gc.createCompatibleImage(
	            image.getWidth(null), image.getHeight(null), transparency);
	    } catch (HeadlessException e) {
	        System.out.println("The system does not have a screen");
	    }

	    if (bimage == null) {
	        int type = BufferedImage.TYPE_INT_RGB;
	        bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
	    }

	    // Copy image to buffered image
	    Graphics g = bimage.createGraphics();

	    // Paint the image onto the buffered image
	    g.drawImage(image, 0, 0, null);
	    g.dispose();

	    return bimage;
	}

	public static void main(final String[] args) {
	    SwingUtilities.invokeLater(new Runnable() {
	        public void run() {
	            try {
	                ImageMain.setup();
	            } catch (IOException ex) {
	                ex.printStackTrace();
	            }
	        }
	    });
	}
	}