Decoding Screen
For the Above UI, we will create a DecodeClass, file naming decode.java Class.
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
public class DecodeClass {
int width,panelWidth,panelHeight;//=1280;
int height;//=720;
JFrame frame;
JPanel actionPanel;
JFrame decodingFrame;
JLabel outputImage;
JButton open = new JButton("Open"), decoButton = new JButton("Decode"),
reset = new JButton("Reset");
JLabel message = new JLabel();
BufferedImage image = null;
//Constructor
public DecodeClass(int width, int height, JFrame dashboardFrame) {
this.width = width;
this.height = height;
this.decodingFrame=dashboardFrame;
getDecodingView(width,height);
}
}
// Decoding Screen UI
private void getDecodingView(int width, int height) {
// frame with control options
frame = new JFrame();
Util.centeredFrame(frame, width, height, "Steganography");
//loginFrame.setResizable(false);
ImageIcon icon = new ImageIcon("ic_lock_black.png");
frame.setIconImage(icon.getImage());
// frame.setLayout(null);
frame.setResizable(false);
frame.addWindowListener(new java.awt.event.WindowAdapter() {
@Override
public void windowClosing(java.awt.event.WindowEvent windowEvent) {
frame.dispose();
decodingFrame.setVisible(true);
}
});
Container frameContainer = frame.getContentPane();
frameContainer.setBackground(Color.green);
int frameControllerSize = (int) (height * 5.7 / 100);
// Changeable According to What size of screen You Want?
int containerWidth = width*94/100;
int containerHeight = height*90/100;
panelWidth = containerWidth*98/100;
panelHeight = containerHeight*96/100;
int posX = width / 2 - panelWidth / 2-8 ;
int posY = height / 2 - panelHeight / 2- frameControllerSize / 2;
// frame without control options
JPanel panel = new JPanel();
panel.setLayout(null);//new BorderLayout());
//panel.setOpaque(false);
panel.setBackground(Color.decode("#FFFFFF"));
panel.setSize(new Dimension(panelWidth,panelHeight));
panel.setLocation(posX, posY);
frameContainer.add(panel);
// for Rounded Background
posX = width / 2 - containerWidth / 2-8 ;
posY = height / 2 - containerHeight / 2 - frameControllerSize / 2;
JComponent jcomponent = new Background(posX, posY, containerWidth, containerHeight);
jcomponent.setLayout(null);
frameContainer.add(jcomponent, BorderLayout.CENTER);
// for heading Layout
posY = panelHeight * 2/100;
Font headingFont = new Font("Serif", Font.PLAIN, 30);
// header
//borderline = BorderFactory.createLineBorder(Color.black);
JLabel heading_text = new JLabel("Steganography");
heading_text.setHorizontalAlignment(JLabel.CENTER);
heading_text.setVerticalAlignment(JLabel.CENTER);
heading_text.setBackground(Color.decode("#80c2b2"));
heading_text.setForeground(Color.black);
heading_text.setFont(headingFont);
heading_text.setBounds(0,0, panelWidth, panelHeight / 9);
panel.add(heading_text);
headingFont = new Font("Serif", Font.PLAIN, 15);
JLabel heading_text_minor = new JLabel("Decoding");
heading_text_minor.setHorizontalAlignment(JLabel.CENTER);
heading_text_minor.setVerticalAlignment(JLabel.CENTER);
heading_text_minor.setBackground(Color.decode("#80c2b2"));
heading_text_minor.setForeground(Color.black);
heading_text_minor.setFont(headingFont);
heading_text_minor.setBounds(0,panelHeight*6/100, panelWidth, panelHeight / 9);
panel.add(heading_text_minor);
panel.add(Util.getSeparator(0, panelHeight / 7, panelWidth, 5,"000000"));
/////
int infoPanelWidth =panelWidth*40/100;
JPanel infoPanel = new JPanel();
infoPanel.setLayout(null);
infoPanel.setBackground(Color.WHITE);
infoPanel.setBounds(panelWidth/40,panelHeight*22/100,infoPanelWidth, panelHeight*70/100);
infoPanel.setBorder(Util.getTitledBorder(16, "Details"));
panel.add(infoPanel,BorderLayout.CENTER);
Border loweredetched = BorderFactory.createEtchedBorder(EtchedBorder.LOWERED);
TitledBorder secretMsgTitle = BorderFactory.createTitledBorder(loweredetched, "Secret Message");
secretMsgTitle.setTitleJustification(TitledBorder.LEFT);
int fieldWidth=panelWidth/4;
// message = JTextArea(10,3);
message.setHorizontalAlignment(JLabel.CENTER);
message.setFont(new java.awt.Font("Serif",0, 15));
message.setBounds((infoPanelWidth)/2-(fieldWidth)/2,panelHeight*10/100, fieldWidth, panelHeight*30/100);
message.setBorder(secretMsgTitle);
infoPanel.add(message);
int posy= panelHeight*50/100;
open=new JButton(new ImageIcon(((new ImageIcon("images/btn.png")).getImage()).getScaledInstance(120,30, java.awt.Image.SCALE_SMOOTH)));
open.setBackground(Color.BLUE);
open.setBounds((infoPanelWidth*20/100)-60,posy,120,30);
open.setBorder(null);
open.setLayout(null);
open.setContentAreaFilled(false);
open.setOpaque(false);
infoPanel.add(open);
open.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
openImage();
}
});
JLabel text = new JLabel("Open");
text.setHorizontalAlignment(JLabel.CENTER);
text.setBackground(Color.decode("#80c2b2"));
text.setForeground(Color.black);
text.setFont(new java.awt.Font("Serif",0, 20));
text.setBounds(0,-2,120,30);
open.add(text);
reset=new JButton(new ImageIcon(((new ImageIcon("images/btn.png")).getImage()).getScaledInstance(120,30, java.awt.Image.SCALE_SMOOTH)));
reset.setBackground(Color.GRAY);
reset.setBorder(null);
reset.setLayout(null);
reset.setContentAreaFilled(false);
reset.setOpaque(false);
reset.setBounds(infoPanelWidth*80/100-60,posy ,120,30);
infoPanel.add(reset);
reset.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
resetInterface();
}
});
text = new JLabel("Reset");
text.setHorizontalAlignment(JLabel.CENTER);
text.setBackground(Color.decode("#80c2b2"));
text.setForeground(Color.black);
text.setFont(new java.awt.Font("Serif",0, 20));
text.setBounds(0,-2,120,30);
reset.add(text);
decoButton=new JButton(new ImageIcon(((new ImageIcon("images/encode_btn.jpg")).getImage()).getScaledInstance(120,30, java.awt.Image.SCALE_SMOOTH)));
decoButton.setBackground(Color.GRAY);
decoButton.setFont(new java.awt.Font("Serif",0, 50));
decoButton.setBounds((infoPanelWidth)/2-60,posy+panelHeight*10/100 ,120,30);
decoButton.setBorder(null);
decoButton.setLayout(null);
decoButton.setContentAreaFilled(false);
decoButton.setOpaque(false);
infoPanel.add(decoButton);
decoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
decodeMessage();
}
});
text = new JLabel("Decode");
text.setHorizontalAlignment(JLabel.CENTER);
text.setBackground(Color.decode("#80c2b2"));
text.setForeground(Color.black);
text.setFont(new java.awt.Font("Serif",0, 20));
text.setBounds(0,-2,120,30);
decoButton.add(text);
/////////////////Action Layout
actionPanel = new JPanel();
actionPanel.setLayout(null);
actionPanel.setBackground(Color.WHITE);
actionPanel.setBounds(panelWidth*3/4-(panelWidth*45/100)/2,panelHeight*20/100, panelWidth*45/100, panelHeight*75/100);
actionPanel.setBorder(Util.getTitledBorder(16, "Output"));
panel.add(actionPanel,BorderLayout.CENTER);
text = new JLabel("Decoded Image");
text.setHorizontalAlignment(JLabel.CENTER);
text.setBackground(Color.decode("#80c2b2"));
text.setForeground(Color.black);
text.setFont(new java.awt.Font("Serif",0, 30));
text.setBounds((panelWidth*45/100)/2-(panelWidth*30/100)/2,panelHeight*5/100,panelWidth*30/100,40);
actionPanel.add(text);
int imgW = panelWidth*40/100;
int imgH = panelHeight*50/100;
outputImage = new JLabel("Select image to decode");
outputImage.setHorizontalAlignment(JLabel.CENTER);
outputImage.setFont(new java.awt.Font("Serif",0, 14));
outputImage.setBounds((panelWidth*45/100)/2-imgW/2,panelHeight*18/100,imgW, imgH);
actionPanel.add(outputImage);
frame.setVisible(true);
}
Now, we will create the method for importing image from the file.
//Import Image code
private void openImage() {
java.io.File f = showFileDialog(true);
try {
image = ImageIO.read(f);
int imgW=panelWidth*40/100;
int imgH=panelHeight*55/100;
ImageIcon backround_img1 = new ImageIcon(image.getScaledInstance(imgW, imgH, java.awt.Image.SCALE_SMOOTH));
Image img1 = backround_img1.getImage();
Image temp_img1 = img1.getScaledInstance(imgW,imgH, Image.SCALE_SMOOTH);
backround_img1 = new ImageIcon(temp_img1);
outputImage.setIcon(backround_img1);
outputImage.setText("");
frame.validate();
} catch(Exception ex) { ex.printStackTrace(); }
}
private java.io.File showFileDialog(boolean open) {
JFileChooser fc = new JFileChooser("Open an image");
javax.swing.filechooser.FileFilter ff = new javax.swing.filechooser.FileFilter() {
public boolean accept(java.io.File f) {
String name = f.getName().toLowerCase();
return f.isDirectory() || name.endsWith(".png") || name.endsWith(".bmp");
}
public String getDescription() {
return "Image (*.png, *.bmp)";
}
};
fc.setAcceptAllFileFilterUsed(false);
fc.addChoosableFileFilter(ff);
java.io.File f = null;
if(open && fc.showOpenDialog(frame) == fc.APPROVE_OPTION)
f = fc.getSelectedFile();
else if(!open && fc.showSaveDialog(frame) == fc.APPROVE_OPTION)
f = fc.getSelectedFile();
return f;
}
//Decode Image code
private void decodeMessage() {
if(image!=null)
{
int len = extractInteger(image, 0, 0);
byte b[] = new byte[len];
for(int i=0; i< len; i++)
b[i] = extractByte(image, i*8+32, 0);
message.setText(new String(b));
JOptionPane.showMessageDialog(frame, "Your Secret message has been Decoded !",
"Decoded Successfully", JOptionPane.INFORMATION_MESSAGE);
}
else {
JOptionPane.showMessageDialog(frame, "Select your Image first",
"Failed", JOptionPane.INFORMATION_MESSAGE);
}
}
private int extractInteger(BufferedImage img, int start, int storageBit) {
int maxX = img.getWidth(), maxY = img.getHeight(),
startX = start/maxY, startY = start - startX*maxY, count=0;
int length = 0;
for(int i=startX; i< maxX && count< 32; i++) {
for(int j=startY; j< maxY && count< 32; j++) {
int rgb = img.getRGB(i, j), bit = getBitValue(rgb, storageBit);
length = setBitValue(length, count, bit);
count++;
}
}
return length;
}
private byte extractByte(BufferedImage img, int start, int storageBit) {
int maxX = img.getWidth(), maxY = img.getHeight(),
startX = start/maxY, startY = start - startX*maxY, count=0;
byte b = 0;
for(int i=startX; i< maxX && count< 8; i++) {
for(int j=startY; j < maxY && count < 8; j++) {
int rgb = img.getRGB(i, j), bit = getBitValue(rgb, storageBit);
b = (byte)setBitValue(b, count, bit);
count++;
}
}
return b;
}
private int getBitValue(int n, int location) {
int v = n & (int) Math.round(Math.pow(2, location));
return v==0?0:1;
}
private int setBitValue(int n, int location, int bit) {
int toggle = (int) Math.pow(2, location), bv = getBitValue(n, location);
if(bv == bit)
return n;
if(bv == 0 && bit == 1)
n |= toggle;
else if(bv == 1 && bit == 0)
n ^= toggle;
return n;
}
After we have decoded the image, let's reset the all the data.
// Reset UI code
private void resetInterface() {
message.setText("");
image = null;
outputImage.setIcon(null);
outputImage.setText("Select image to decode");
frame.validate();
}
Lastly, we will create a method for returning frame.
public Window getFrameRef() {
// TODO Auto-generated method stub
return frame;
}
We have successfully created the Decoding screen with functional code.
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