PDF To JPG Converter

The PDFToJPGConverter program is able to convert all pages of a PDF document to JPG image format. Each page is converted to one image file.
In Java, it is simple to convert a PDF document to images by using PdfBox library. You can download the library jar file at http://pdfbox.apache.org/.  One additional library that you also need is FontBox. It can be dowloaded  from http://sourceforge.net/projects/fontbox/.

PDFToJPGConverter source code:

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import javax.imageio.ImageIO;
import org.pdfbox.TextToPDF;
import org.pdfbox.exceptions.COSVisitorException;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.PDPage;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.JFileChooser;

public class PDFToJPGConverter{
public static void main(String[] args){

selectPdf();

}

//allow images selection for converting
public static void selectPdf(){

JFileChooser chooser = new JFileChooser();
    FileNameExtensionFilter filter = new FileNameExtensionFilter("PDF","pdf");
    chooser.setFileFilter(filter);
    chooser.setMultiSelectionEnabled(false);
    int returnVal = chooser.showOpenDialog(null);
    if(returnVal == JFileChooser.APPROVE_OPTION) {
File file=chooser.getSelectedFile();  
            convertPDFToJPG(file.toString());
            }

     
}

public static void convertPDFToJPG(String src){

try{

//load pdf file in the document object
PDDocument doc=PDDocument.load(new FileInputStream(src));
//Get all pages from document and store them in a list
List<PDPage> pages=doc.getDocumentCatalog().getAllPages();
//create iterator object so it is easy to access each page from the list
Iterator<PDPage> i= pages.iterator();
int count=1; //count variable used to separate each image file
//Convert every page of the pdf document to a unique image file
System.out.println("Please wait...");
while(i.hasNext()){
PDPage page=i.next();
BufferedImage bi=page.convertToImage();
ImageIO.write(bi, "jpg", new File("pdfimage"+count+".jpg"));
count++;
}
System.out.println("Conversion complete");
}catch(IOException ie){ie.printStackTrace();}
}



}

In the example code above, the PDDocument class is used to create a pdf document from the InputStream object. The InputStream object contains all data of the original pdf file. Once you have the pdf document object, you can get all pages of the pdf document by using the getAllPages method from the document catalog object. The document catalog object is returned by the getDocumentCatalog method of the pdf document object. You will use the List data structure to store all pages of the pdf document. Each page of the pdf document is represented by the PDPage object. From this object, you can convert the page to the BufferedImage object by using the convertToImage method.