..Souce Code of org.apache.pdfbox.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.
See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the “License”); you may not use this file except in compliance with
* the License.
You may obtain a copy of the License at
*
*
http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an “AS IS” BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox;
import org.apache.pdfbox.exceptions.InvalidPasswordException;
import org.apache.pdfbox.pdfviewer.PageWrapper;
import org.apache.pdfbox.pdfviewer.ReaderBottomPanel;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.util.ExtensionFileFilter;
import javax.swing.JFileChooser;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import java.awt.print.PrinterException;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.util.List;
/**
* An application to read PDF documents.
This will provide Acrobat Reader like
* funtionality.
*
* @author Ben Litchfield
* @version $Revision: 1.5 $
*/
public class PDFReader extends javax.swing.JFrame
{
private File currentDir=new File(“.”);
private javax.swing.JMenuItem aboutMenuItem;
private javax.swing.JMenuItem contentsMenuItem;
private javax.swing.JMenuItem exitMenuItem;
private javax.swing.JMenu fileMenu;
private javax.swing.JMenu helpMenu;
private javax.swing.JMenuBar menuBar;
private javax.swing.JMenuItem openMenuItem;
private javax.swing.JMenuItem printMenuItem;
private javax.swing.JMenu viewMenu;
private javax.swing.JMenuItem nextPageItem;
private javax.swing.JMenuItem previousPageItem;
private JPanel documentPanel = new JPanel();
private ReaderBottomPanel bottomStatusPanel = new ReaderBottomPanel();
private PDDocument document = null;
private List pages= null;
private int currentPage = 0;
private int numberOfPages = 0;
private String currentFilename = null;
/**
* Constructor.
*/
public PDFReader()
{
initComponents();
}
/**
* This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
private void initComponents()
{
menuBar = new javax.swing.JMenuBar();
fileMenu = new javax.swing.JMenu();
openMenuItem = new javax.swing.JMenuItem();
exitMenuItem = new javax.swing.JMenuItem();
helpMenu = new javax.swing.JMenu();
contentsMenuItem = new javax.swing.JMenuItem();
aboutMenuItem = new javax.swing.JMenuItem();
printMenuItem = new javax.swing.JMenuItem();
viewMenu = new javax.swing.JMenu();
nextPageItem = new javax.swing.JMenuItem();
previousPageItem = new javax.swing.JMenuItem();
setTitle(“PDFBox – PDF Reader”);
addWindowListener(new java.awt.event.WindowAdapter()
{
public void windowClosing(java.awt.event.WindowEvent evt)
{
exitApplication();
}
});
JScrollPane documentScroller = new JScrollPane();
documentScroller.setViewportView( documentPanel );
getContentPane().add( documentScroller, java.awt.BorderLayout.CENTER );
getContentPane().add( bottomStatusPanel, java.awt.BorderLayout.SOUTH );
fileMenu.setText(“File”);
openMenuItem.setText(“Open”);
openMenuItem.setToolTipText(“Open PDF file”);
openMenuItem.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
openMenuItemActionPerformed(evt);
}
});
fileMenu.add(openMenuItem);
printMenuItem.setText( “Print” );
printMenuItem.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
try
{
if (document != null)
{
document.print();
}
}
catch( PrinterException e )
{
e.printStackTrace();
}
}
});
fileMenu.add( printMenuItem );
exitMenuItem.setText(“Exit”);
exitMenuItem.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
exitApplication();
}
});
fileMenu.add(exitMenuItem);
menuBar.add(fileMenu);
helpMenu.setText(“Help”);
contentsMenuItem.setText(“Contents”);
helpMenu.add(contentsMenuItem);
aboutMenuItem.setText(“About”);
helpMenu.add(aboutMenuItem);
//menuBar.add(helpMenu);
viewMenu.setText(“View”);
nextPageItem.setText(“Next page”);
nextPageItem.setAccelerator(KeyStroke.getKeyStroke(‘+’));
nextPageItem.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
nextPage();
}
});
viewMenu.add(nextPageItem);
previousPageItem.setText(“Previous page”);
previousPageItem.setAccelerator(KeyStroke.getKeyStroke(‘-‘));
previousPageItem.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
previousPage();
}
});
viewMenu.add(previousPageItem);
menuBar.add(viewMenu);
setJMenuBar(menuBar);
java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
setBounds((screenSize.width-700)/2, (screenSize.height-600)/2, 700, 600);
}
private void updateTitle() {
setTitle( “PDFBox – ” + currentFilename + ” (“+(currentPage+1)+”/”+numberOfPages+”)”);
}
private void nextPage()
{
if (currentPage < numberOfPages-1){currentPage++;updateTitle();showPage(currentPage);}}private void previousPage(){if (currentPage > 0 )
{
currentPage–;
updateTitle();
showPage(currentPage);
}
}
private void openMenuItemActionPerformed(java.awt.event.ActionEvent evt)
{
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(currentDir);
ExtensionFileFilter pdfFilter = new ExtensionFileFilter(new String[] {“PDF”}, “PDF Files”);
chooser.setFileFilter(pdfFilter);
int result = chooser.showOpenDialog(PDFReader.this);
if (result == JFileChooser.APPROVE_OPTION)
{
String name = chooser.getSelectedFile().getPath();
currentDir = new File(name).getParentFile();
try
{
openPDFFile(name);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
private void exitApplication()
{
try
{
if( document != null )
{
document.close();
}
}
catch( IOException io )
{
//do nothing because we are closing the application
}
this.setVisible( false );
this.dispose();
}
/**
* @param args the command line arguments
*
* @throws Exception If anything goes wrong.
*/
public static void main(String[] args) throws Exception
{
PDFReader viewer = new PDFReader();
if( args.length >0 )
{
viewer.openPDFFile( args[0] );
}
viewer.setVisible(true);
}
private void openPDFFile(String file) throws Exception
{
if( document != null )
{
document.close();
documentPanel.removeAll();
}
InputStream input = null;
File f = new File( file );
input = new FileInputStream(f);
document = parseDocument( input );
pages = document.getDocumentCatalog().getAllPages();
numberOfPages = pages.size();
currentFilename = f.getAbsolutePath();
currentPage = 0;
updateTitle();
showPage(0);
}
private void showPage(int pageNumber)
{
try
{
PageWrapper wrapper = new PageWrapper( this );
wrapper.displayPage( (PDPage)pages.get(pageNumber) );
if (documentPanel.getComponentCount() > 0)
{
documentPanel.remove(0);
}
documentPanel.add( wrapper.getPanel() );
pack();
}
catch (IOException exception)
{
exception.printStackTrace();
}
}
/**
* This will parse a document.
*
* @param input The input stream for the document.
*
* @return The document.
*
* @throws IOException If there is an error parsing the document.
*/
private static PDDocument parseDocument( InputStream input )throws IOException
{
PDDocument document = PDDocument.load( input );
if( document.isEncrypted() )
{
try
{
document.decrypt( “” );
}
catch( InvalidPasswordException e )
{
System.err.println( “Error: The document is encrypted.” );
}
catch( org.apache.pdfbox.exceptions.CryptographyException e )
{
e.printStackTrace();
}
}
return document;
}
/**
* Get the bottom status panel.
*
* @return The bottom status panel.
*/
public ReaderBottomPanel getBottomStatusPanel()
{
return bottomStatusPanel;
}
}
Related Class of org.apache.pdfbox.PDFReader
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