Classical_encryption

Caesar

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

import javax.swing.border.EmptyBorder;

public class Encryption extends JFrame {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private JPanel contentPane;
	private JLabel reminder;
	private JTextField textField_2;
	private JTextField textField_1;
	private JTextField textField_3;
	private String message;
	private String key;
	private JTextField txtkey;
	private boolean hasMessage=false;
	private boolean hasKey=false;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Encryption frame = new Encryption();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public Encryption() {
		setTitle("Caesar algorithm");
		setResizable(false);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 361, 226);
		contentPane = new JPanel();
		contentPane.setBackground(SystemColor.inactiveCaption);
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		{
			textField_1 = new JTextField();
			textField_1.addFocusListener(new FocusAdapter() {
				@Override
				public void focusGained(FocusEvent arg0) {
					textField_1.setText("");
					message = "";
					hasMessage = false;
				}
				@Override
				public void focusLost(FocusEvent e) {
					if(textField_1.getText().equals("")){
						textField_1.setFont(new Font("宋体", Font.ITALIC, 12));
						textField_1.setText("\u8F93\u5165\u660E\u6587\u6216\u5BC6\u6587...");
						hasMessage = false;
					}else{
						message = textField_1.getText();
						hasMessage = true;
					}
				}
			});
			textField_1.setToolTipText("");
			textField_1.setBounds(51, 22, 281, 31);
			contentPane.add(textField_1);
			textField_1.setColumns(10);
		}
		{
			txtkey = new JTextField();
			txtkey.addFocusListener(new FocusAdapter() {
				@Override
				public void focusGained(FocusEvent arg0) {
					key = "";
					hasKey = false;
					txtkey.setText("");
				}
				@Override
				public void focusLost(FocusEvent e) {
					if(txtkey.getText().equals("")){
						txtkey.setFont(new Font("宋体", Font.ITALIC, 12));
						txtkey.setText("\u8F93\u5165key...");
						hasKey = false;
					}else{
						key = txtkey.getText();
						hasKey = true;
						reminder.setText("");
					}
				}
			});
			txtkey.setFont(new Font("宋体", Font.ITALIC, 12));
			txtkey.setText("\u8F93\u5165key...");
			txtkey.setBounds(51, 63, 76, 32);
			contentPane.add(txtkey);
			txtkey.setColumns(10);
		}
		{
			textField_2 = new JTextField();
			textField_2.setEnabled(false);
			textField_2.setBounds(51, 105, 210, 31);
			contentPane.add(textField_2);
			textField_2.setColumns(10);
		}
		{
			textField_3 = new JTextField();
			textField_3.setEnabled(false);
			textField_3.setBounds(51, 146, 210, 31);
			contentPane.add(textField_3);
			textField_3.setColumns(10);
		}
		{
			JLabel label = new JLabel("\u62A5 \u6587");
			label.setForeground(new Color(0, 0, 0));
			label.setFont(new Font("微软雅黑", Font.PLAIN, 12));
			label.setHorizontalAlignment(SwingConstants.CENTER);
			label.setBounds(0, 26, 54, 23);
			contentPane.add(label);
		}
		{
			JLabel label = new JLabel("\u5BC6 \u94A5");
			label.setFont(new Font("微软雅黑", Font.PLAIN, 12));
			label.setHorizontalAlignment(SwingConstants.CENTER);
			label.setBounds(0, 67, 54, 23);
			contentPane.add(label);
		}
		{
			JLabel label = new JLabel("\u52A0 \u5BC6");
			label.setFont(new Font("微软雅黑", Font.PLAIN, 12));
			label.setHorizontalAlignment(SwingConstants.CENTER);
			label.setBounds(0, 109, 54, 23);
			contentPane.add(label);
		}
		{
			JLabel label = new JLabel("\u89E3 \u5BC6");
			label.setFont(new Font("微软雅黑", Font.PLAIN, 12));
			label.setHorizontalAlignment(SwingConstants.CENTER);
			label.setBounds(0, 150, 54, 23);
			contentPane.add(label);
		}
		{
			JButton button = new JButton("\u52A0\u5BC6");
			button.setFont(new Font("微软雅黑", Font.PLAIN, 12));
			button.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent arg0) {
					if(hasMessage==true && hasKey==true){
						textField_2.setText(encryption());
					}else{
						reminder.setText("不能为空");
					}
				}
			});
			button.setBounds(271, 105, 61, 31);
			contentPane.add(button);
		}
		{
			JButton button = new JButton("\u89E3\u5BC6");
			button.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent arg0) {
					if(hasMessage==true && hasKey==true){
						textField_3.setText(decryption());
					}else{
						reminder.setText("不能为空");
					}
				}
			});
			button.setFont(new Font("微软雅黑", Font.PLAIN, 12));
			button.setBounds(271, 146, 61, 31);
			contentPane.add(button);
		}
		{
			JButton button = new JButton("\u5173\u95ED");
			button.setFont(new Font("微软雅黑", Font.PLAIN, 12));
			button.addMouseListener(new MouseAdapter() {
				@Override
				public void mouseClicked(MouseEvent arg0) {
					System.exit(0);
				}
			});
			button.setBounds(271, 63, 61, 31);
			contentPane.add(button);
		}
		{
			JButton button = new JButton("\u91CD\u7F6E");
			button.setFont(new Font("微软雅黑", Font.PLAIN, 12));
			button.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent arg0) {
					textField_1.setText("");
					textField_2.setText("");
					txtkey.setText("");
					textField_3.setText("");
					hasMessage = false;
					hasKey = false;
					message = "";
					key = "";
					reminder.setText("");
				}
			});
			button.setForeground(new Color(25, 25, 112));
			button.setBounds(192, 64, 61, 31);
			contentPane.add(button);
		}
		{
			reminder = new JLabel("");
			reminder.setFont(new Font("微软雅黑", Font.PLAIN, 12));
			reminder.setBounds(128, 66, 54, 24);
			contentPane.add(reminder);
		}
	}

	
	/*
	 * encryption()
	 */
	public String encryption(){
		char[] array=message.toCharArray();
		try{
			int mode=Integer.parseInt(key);
			mode=mode%26;
			for(int i=0; i<array.length; i++)
			{
				array[i] = (char)(array[i] + mode);
			}
		}catch(Exception e){
			reminder.setText("ERROR!");
		}
		return new String(array);
	}
	/*
	 * decryption()
	 */
	public String decryption(){
		char[] array=message.toCharArray();
		try{
			int mode=Integer.parseInt(key);
			mode=mode%26;
			for(int i=0; i<array.length; i++)
			{
				array[i] = (char)(array[i] - mode);
			}
		}catch(Exception e){
			reminder.setText("ERROR!");
		}
		return new String(array);
	}
}