Pdf reader

PdfReader is a simple pdf reader program. The main api used in this program is PDFRenderer . At the right side bar in the reference list, you will find a link to get more information about the PDFRenderer api.
With PdfReader you can select a PDF file to be viewed, move one page forward and backward, zoom the page in and out, go to a specific page, save the page in image format, and print the PDF document to a default printer in your computer system.

PdfReader source code:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Desktop;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.filechooser.FileNameExtensionFilter;
import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFPage;


class Starter extends JFrame implements ActionListener{
Rectangle rect;
PDFPage page;
Image img;
int adjx=0;
int adjy=0;
JLabel lblimg;
PDFFile pdf;
File f;
int pageNum=1;
int numPages;
JTextField txtPNum;
JButton btnext;
JButton btpre;
JButton btin;
JButton btout;
JButton btcapture;
JButton btprint;
JPanel panel;


public Starter(String title){

Container cont=getContentPane(); //get container of the JFrame
cont.setLayout(new BorderLayout()); //apply border layout to the container
//Show File menu
JMenuBar mainmenu=new JMenuBar();
JMenu menu=new JMenu("File");
JMenuItem mopen=new JMenuItem("Open...");
mopen.setMnemonic(KeyEvent.VK_O);
mopen.addActionListener(this);
JMenuItem mexit=new JMenuItem("Exit");
mexit.setMnemonic(KeyEvent.VK_X);
mexit.addActionListener(this);
menu.add(mopen);
menu.add(mexit);
mainmenu.add(menu);
    setJMenuBar(mainmenu);
    //show buttons, labels, and a text box
panel=new JPanel();
JButton btnext=new JButton(">");
JButton btpre=new JButton("<");
JButton btin=new JButton("+");
JButton btout=new JButton("-");
txtPNum=new JTextField();
txtPNum.addKeyListener(new KeyA());
JLabel lblPNum=new JLabel("Page:");
lblPNum.setHorizontalAlignment(JLabel.CENTER);
btcapture=new JButton("Capture");
btprint=new JButton("Print");
btnext.addActionListener(this);
btpre.addActionListener(this);
btin.addActionListener(this);
btout.addActionListener(this);
btcapture.addActionListener(this);
btprint.addActionListener(this);
panel.setLayout(new GridLayout(1,6));
panel.setBackground(Color.BLACK);
panel.add(btnext);
panel.add(btpre);
panel.add(btin);
panel.add(btout);
panel.add(lblPNum);
panel.add(txtPNum);
panel.add(btcapture);
panel.add(btprint);
applyComponentStyles();
cont.add(panel,BorderLayout.NORTH);
lblimg=new JLabel();
lblimg.setHorizontalAlignment(JLabel.CENTER);
JScrollPane jscroll=new JScrollPane(lblimg);
cont.add(jscroll,BorderLayout.CENTER);
setExtendedState(this.getExtendedState() | JFrame.MAXIMIZED_BOTH);
setTitle(title); //set the title of the JFrame
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//closable JFrame
setVisible(true);
setIconImage(getToolkit().getImage("pdfviewicon.png"));
panel.setVisible(false);
}

public void getFile(String filename){
//read pdf file and place its data in PDFFile object for later use
try{
f=new File(filename); //create file object
RandomAccessFile raf=new RandomAccessFile(f,"r"); //open the file for reading
FileChannel pc=raf.getChannel(); //get the file channel
ByteBuffer buffer=pc.map(FileChannel.MapMode.READ_ONLY, 0, pc.size()); //store file data in the memory
pdf=new PDFFile(buffer);//place the file data in memory in PDFFile object
numPages=pdf.getNumPages(); //get the number of pages of the pdf document
raf.close();//close reader
moveFist(); //show the first page


}catch(IOException e){System.out.println("Error in open the file");System.exit(-1);}

}

//apply background, text colors, and font to components
public void applyComponentStyles(){
Component[] coms=panel.getComponents();
for(Component c:coms){
c.setBackground(Color.BLACK);
c.setForeground(Color.WHITE);
c.setFont(new Font("Arial",Font.BOLD,15));

}
}


//do an action when a button or menu item is selected
public void actionPerformed(ActionEvent e){


if(e.getActionCommand().equals("+"))
doZoomin();
else if(e.getActionCommand().equals("-"))
doZoomout();
else if(e.getActionCommand().equals(">"))
moveNext();
else if(e.getActionCommand().equals("<"))
movePrevious();
else if(e.getActionCommand().equals("Capture"))
capturePage(img);
else if(e.getActionCommand().equals("Print"))
print();

else if(e.getActionCommand().equals("Open..."))
selectPDF();
else if(e.getActionCommand().equals("Exit"))
System.exit(0);

}

public void print(){
Desktop dt=Desktop.getDesktop();
try{
dt.print(f);
}catch(IOException ie){}
}
//display the pdf page as an image on the JLabel lblimg
public void showImage(){
int w=rect.width+adjx;
        int h=rect.height+adjy;
        img = page.getImage(
                w,h, //width & height
                rect, // clip rect
                null, // null for the ImageObserver
                true, // fill background with white
                true  // block until drawing is done
                );
        lblimg.setIcon(new ImageIcon(img));
        txtPNum.setText(page.getPageNumber()+"");
     
}
//increase the image page size
public void doZoomin(){
adjx+=10;
adjy+=10;
        showImage();
        repaint();
}
//decrease the image page size
public void doZoomout(){
adjx-=10;
adjy-=10;
        showImage();
        repaint();
}
//move to first page
public void moveFist(){
pageNum=1;
displayPage(pageNum);

}
//move to next page
public void moveNext(){
if(pageNum<numPages){
pageNum+=1;
displayPage(pageNum);
}

}
//move to previous page
public void movePrevious(){
if(pageNum>0){
pageNum-=1;
displayPage(pageNum);
}
}
//goto a page
public void gotoPage(int num){
if(num>=0 && num<=numPages){
displayPage(num);
pageNum=num; //update pageNum to the current page
}

}
//get the page and show it
public void displayPage(int n){
page=pdf.getPage(n); //get the current page
//get the width and height of the page
rect = new Rectangle(0,0,(int)page.getBBox().getWidth(),(int)page.getBBox().getHeight());
showImage(); //show the page
 
}
//The createBufferedImageFromImage method is able to generate a buffered image from an input image
public void capturePage(Image image)
  {
int width=image.getWidth(null);
int height= image.getHeight(null);
  BufferedImage dest = new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB);
    Graphics2D g2 = dest.createGraphics();
    g2.drawImage(image, 0, 0,width, height, null);
    g2.dispose();
    try{
   
    ImageIO.write(dest, "png", new File("pdfpage"+pageNum+".png"));
   
    }catch(IOException ie){}
   
  }

class KeyA extends KeyAdapter{
public void keyReleased(KeyEvent ke){
char c = ke.getKeyChar();
int intkey=(int)c;
if(!(intkey>=48 && intkey<=57 || intkey==8))
  {
ke.consume(); //hide the unwanted key

  }
else
if(!txtPNum.getText().equals("")){
gotoPage(Integer.parseInt(txtPNum.getText()));
}
}
}

public 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();
getFile(file.toString());
panel.setVisible(true);
}

     
}
}


public class PdfReader {
public static void main(String[] args){
new Starter("PDF Reader");
}


}