Write a program that allows users to encrypt files. We will implement two simple

Question

Write a program that allows users to encrypt files. We will implement two simple encryption methods. Have the following GUI components: Have a button that when pressed opens a Fil Have the user choose the file with the FileChooser. Encrypt the contents of the file and put the results in a TextArea. First Encryption Technique The first file encryption technique we will use for this program is the highly secure "one letter off system. So an"a" will be represented by a "b", and a "b" will be represented by a "c" in the encrypted file and so on.

Explanation / Answer

/*
* COMMENTS: I HAVE USED SWINGS FOR UI ,AND I PRESENTED A ROUGH WORKING SKETCH FOR YOUR PROBLEM
* FOR THE CASE PROVIDED YOU NEED NOT HAVE COMPLE LOGIC ,FOLLOW THE CODE IN ENCRYPT BUTTON
* I HOPE U WILL SURELY GET THE LOGIC,ITS JUST CONVERSION OF STRING TO CHAR ARRAY AND THEN
* THE RESPECTION ELEMENT IS INCREMENTED BY ONE SO AS TO MEET YOUR CRITERIA
*
* SO NOW YOU CAN REPLACE THE LOGIC IN YOUR SCENEBUILDER AND DO RESPECTIVE MODIFICATIONS
* TO ACHIEVE YOUR GOAL
*
* ALL THE BEST
*/
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class SwingControlDemo {
   private JFrame mainFrame;
   private JPanel controlPanel;
   private JTextArea textArea;
   private String s=null;

   public SwingControlDemo(){
       prepareGUI();
   }
   public static void main(String[] args){
       SwingControlDemo swingControlDemo = new SwingControlDemo();
       swingControlDemo.showFileChooserDemo();
   }
   private void prepareGUI(){
       mainFrame = new JFrame("encrypt text file");
       mainFrame.setSize(400,400);
       mainFrame.setLayout(new GridLayout(1, 4));

       mainFrame.addWindowListener(new WindowAdapter() {
           public void windowClosing(WindowEvent windowEvent){
               System.exit(0);
           }
       });

       controlPanel = new JPanel();
       controlPanel.setLayout(new FlowLayout());

       mainFrame.add(controlPanel);
       mainFrame.setVisible(true);
   }
   private void showFileChooserDemo(){
       final JFileChooser fileDialog = new JFileChooser();
       JButton showFileDialogButton = new JButton("Open File");

       showFileDialogButton.addActionListener(new ActionListener() {
           @Override
           public void actionPerformed(ActionEvent e) {
               int returnVal = fileDialog.showOpenDialog(mainFrame);

               if (returnVal == JFileChooser.APPROVE_OPTION) {
                   java.io.File file = fileDialog.getSelectedFile();
                   BufferedReader br =null;
                   try {
                       br = new BufferedReader(new FileReader(file) );
                       StringBuilder sb = new StringBuilder();
                       String line = br.readLine();

                       while (line != null) {
                           sb.append(line);
                           //                           sb.append(System.lineSeparator());
                           line = br.readLine();

                       }
                       String everything = sb.toString();
                       System.out.println(everything);
                       s=everything;
                   }
                   catch(Exception ee)
                   {
                       ee.printStackTrace();
                   }finally {
                       try {
                           br.close();
                       } catch (IOException e1) {
                           // TODO Auto-generated catch block
                           e1.printStackTrace();
                       }
                   }       
                   System.out.println("File Selected :" + file.getName());
               } else {
                   System.out.println("Open command cancelled by user." );   
               }
           }
       });

       JButton encryptButton = new JButton("encrypt");

       encryptButton.addActionListener(new ActionListener() {
           @Override
           public void actionPerformed(ActionEvent e) {

               String encrypted =null;
               char chars[] = s.toCharArray();
               char encrypt[] = new char[chars.length];
               encrypt =chars;

               for (int i=0;i<chars.length;i++)
               {
                   if(chars[i]!=' '&&!String.valueOf(chars[i]).equalsIgnoreCase(" ")){
                       int j =(int)chars[i];
                       j=j+1;
                       System.out.print((char)(j));
                       encrypt[i]=(char)(j);
                   }
                   else if(chars[i]==' ')
                   {
                       System.out.print(" ");
                   }
                   else{
                       encrypt[i]=chars[i];
                       System.out.println();
                   }
               }
               String text =new String(encrypt);
               textArea.setText(text);
           }

       });

       textArea = new JTextArea(5, 20);
       JScrollPane scrollPane = new JScrollPane(textArea);
       textArea.setEditable(false);

       controlPanel.add(showFileDialogButton);
       controlPanel.add(encryptButton);
       controlPanel.add(textArea);
       mainFrame.setVisible(true);
   }
}

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