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Tags/Keywords : PDF Java example, PDF Java, PDF Box, PDF Screen,Article, simple, example
Author : Amit
Date (Year/Month/Date): 2010-05-09
Recently I was doing an example /POC on using Apache PDFBOX,
thereby writing a PDF viewer type of screen using Java's
Swing API. In this process I was able to show a single
page from an external PDF file/page on screen, but encountered
a typical issue, that can be from using Swing API or/and 
PDFBox API, I am not sure how to resolve this yet.

Following is the code that I was refering about:

PDFViewer.java

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.IOException;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JToolBar;

import org.apache.pdfbox.PDFReader;
import org.apache.pdfbox.pdfviewer.PDFPagePanel;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.common.PDRectangle;

public class PDFViewer
{
  public PDFViewer(String pdfFileName) {
    System.out.println("PDF file name to show is :"+pdfFileName);
    final PDDocument pdDoc;
  try {
    JFrame screen = new JFrame(pdfFileName);
    Dimension dm = Toolkit.getDefaultToolkit().getScreenSize();
    screen.setSize(dm);

    File file = new File(pdfFileName);
    pdDoc = PDDocument.load(file);
    PDFPagePanel pdfPagePanel = new PDFPagePanel();
    pdfPagePanel.setSize(1000,1000);
    int numOfPages = pdDoc.getNumberOfPages();
    PDPage pdPage = (PDPage) pdDoc.getPrintable(13);
    pdPage.findCropBox().setLowerLeftX(1);
    pdPage.setCropBox(new PDRectangle(1000f,1000f));
    pdPage.setMediaBox(new PDRectangle(1000f,1000f));
    pdPage.setArtBox(new PDRectangle(1000f,1000f));
    pdPage.setBleedBox(new PDRectangle(1000f,1000f));
    System.out.println(pdPage.getCropBox().getHeight());
    pdfPagePanel.setPage(pdPage);

    JScrollPane scrolPane = new JScrollPane(pdfPagePanel);
    scrolPane.setVerticalScrollBar(new JScrollBar());
    scrolPane.setWheelScrollingEnabled(true);

    JToolBar toolBar = new JToolBar();
    ImageIcon imageiconP = new ImageIcon("Previous.png");
    ImageIcon imageiconN = new ImageIcon("Next.png");
    JButton butP = new JButton(imageiconP);
    JButton butN = new JButton(imageiconN);	
    toolBar.add(butP);
    toolBar.add(butN);
    screen.getContentPane().setLayout(new BorderLayout());
    screen.getContentPane().add(toolBar, BorderLayout.NORTH);
    screen.getContentPane().add(scrolPane, BorderLayout.CENTER);
    screen.setVisible(true);
    screen.show();
    screen.addWindowListener(new WindowAdapter(){
      public void windowClosing(WindowEvent we) {
        try {
	 pdDoc.close();
        } catch (IOException e) {
	  e.printStackTrace();
        }
        System.exit(0);
      }
    });
    System.out.println("end");
  } catch (IOException e) {
 
    e.printStackTrace();
  } finally {
 }
}
  public static void main(String[] args) 
  {
    new PDFViewer(args[0]);
  }
}


This program is tested in my local dev environment, but
as I have already mentioned, it is not showing the Page
from the PDF document with a scroll bar to be able to
navigate across this page, which is not working in this
code.
Actually I had tried using JScrollPane and many more
methods on the PDPage from PDFBox, but failed to show a
scroll bar in order to move or go through the complete
page shown on screen.

I have used PDFPagePanel from PDFBox to be embeded in a 
JFrame from SWING API.

If anyone has some time and willing to help, please help
me in achieving this very specific issue on hand.

If you have any further queries for which you need
clarification, please do let me know by using following
comments section.

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