import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import com.lowagie.text.*;
import com.lowagie.text.pdf.*;

class PDFViewer 
{
    public static void main(String[] args) 
    {
        final JFrame f=new JFrame();
        f.setLayout(null);
        JLabel label=new JLabel("Select File");
        final JTextField text=new JTextField(20);
        final JTextArea area=new JTextArea(20,10);
        final JScrollPane pane=new JScrollPane(area);
        JButton b1=new JButton("Browse");
        JButton b2=new JButton("Show Data");

        b1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
                JFileChooser fileChooser = new JFileChooser(new File("C:/"));
                fileChooser.addChoosableFileFilter(new MyFilter());

                fileChooser.showOpenDialog(f);
               File f=fileChooser.getSelectedFile();
               String path=f.getPath();
               text.setText(path);

            }
        });

      b2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
                File f=new File(text.getText());
                try {
      Document document = new Document();
      document.open();
      PdfReader reader = new PdfReader(f.getPath());
      PdfDictionary dictionary = reader.getPageN(1);
      PRIndirectReference reference = (PRIndirectReference) 
                dictionary.get(PdfName.CONTENTS);
                        PRStream stream = (PRStream) PdfReader.getPdfObject(reference);
                        byte[] bytes = PdfReader.getStreamBytes(stream);
                        PRTokeniser tokenizer = new PRTokeniser(bytes);
                        StringBuffer buffer = new StringBuffer();
                        while (tokenizer.nextToken()) {
                        if (tokenizer.getTokenType() == PRTokeniser.TK_STRING) {
                                        buffer.append(tokenizer.getStringValue());
                                        buffer.append("\n");
                                        }
                        }
                String test=buffer.toString();
                area.append(test);

                document.close();
      }
         catch (Exception ex) {}
         pane.setVisible(true);
         }
        });

        label.setBounds(10,10,100,20);
        text.setBounds(120,10,120,20);
        b1.setBounds(260,10,100,20);
        b2.setBounds(380,10,100,20);

        pane.setBounds(120,40,360,100);
        pane.setVisible(false);


        f.add(label);
        f.add(text);
        f.add(b1);
        f.add(b2);
        f.add(pane);
        f.setVisible(true);
        f.setSize(500,300);
    }
}

class MyFilter extends javax.swing.filechooser.FileFilter {
    public boolean accept(File file) {
        String filename = file.getName();
        return filename.endsWith(".pdf");
    }
    public String getDescription() {
        return "*.pdf";
    }
}

For the above code, you need itext api