JAVA记事本的图形用户界面应用程序含加密

JAVA记事本的图形用户界面应用程序 加密

题目简介：

整体分析：

实验代码：

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import javax.swing.JFrame;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JSeparator;
import javax.swing.JTextArea;
import javax.xml.transform.Templates;

/**记事本的图形用户界面应用程序 加密
 * @author 李祖林
 *2017-6-22
 */
public class Note2 implements ActionListener{

    private JFrame frame;
    JMenuItem New,Open,Save,Close;        //四个菜单栏
    JTextArea textArea;                    //输入框
    File flieName = new File("D://file.txt");    //默认文件路径

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Note2 window = new Note2();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }


    public Note2() {
        
        frame = new JFrame();
        frame.setBounds(100, 100, 567, 350);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(new BorderLayout(0, 0));
        
        textArea = new JTextArea();
        frame.getContentPane().add(textArea, BorderLayout.CENTER);
        
        JMenuBar menuBar = new JMenuBar();
        frame.getContentPane().add(menuBar, BorderLayout.NORTH);
        
        JMenu menu = new JMenu("\u6587\u4EF6");
        menuBar.add(menu);
        
        New = new JMenuItem("\u65B0\u5EFA");
        menu.add(New);New.addActionListener(this);
        
        Open = new JMenuItem("\u6253\u5F00");
        menu.add(Open);Open.addActionListener(this);
        
        Save = new JMenuItem("\u4FDD\u5B58");
        menu.add(Save);Save.addActionListener(this);
        
        JSeparator separator = new JSeparator();
        menu.add(separator);
        
        Close = new JMenuItem("\u9000\u51FA");
        menu.add(Close);Close.addActionListener(this);
    }


    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == New){
            textArea.setText("");
        }else if(e.getSource() == Open){
            textArea.setText("");
            readFile();
        }else if(e.getSource() == Save){
            saveFile();
        }else{
            System.exit(0);
        }
    }
    
    /*解码的过程*/
    public void readFile(){
        try {
            BufferedReader bufferedReader = new BufferedReader(new FileReader(flieName));
            String text;                            //每行字符串
            char[] ch = new char[1024];                //字符数组
            int tmp;                                //字符的ASCII码值
            while((text = bufferedReader.readLine())!=null){
                ch = text.toCharArray();            //字符串->字符数组
                
                for(int i = 0;i < ch.length;i++){    
                    tmp = (int)ch[i] - 30;            //解密
                    if(tmp<0){
                        tmp += 127;
                    }
                    ch[i] = (char)tmp;                //转化为字符
                }
                
            text = String.valueOf(ch);                //转化为字符串
            textArea.append(text);                
            }
            bufferedReader.close();
        } catch (IOException e) {
            System.err.println("读取文件发生错误！");
        }
    }
    
    /*加密的过程*/
    public void saveFile(){
        try {
            BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(flieName));
            String string = textArea.getText();                //获取文本框内容
            char[] ch = new char[1024];                        //字符数组
            int tmp;                                        //字符的ASCII码值
            ch = string.toCharArray();                        //字符串->字符数组
            for(int i = 0;i < string.length();i++){
                tmp = (int)ch[i] + 30;                        //加密:ASCII+30(<=127)
                if(tmp>127) 
                    tmp -= 127;
                ch[i] = (char)tmp;                            
            }
            string = String.valueOf(ch);                    //转化成字符串的两种方式    
            /*两种方式：string = ch.toString();*/
            bufferedWriter.write(string);                    //写入
            bufferedWriter.close();
        } catch (IOException e) {
            System.err.println("写入文件错误！");
        }
    }
    
}

实验结果：

加密前：

加密后：