JAVA记事本的图形用户界面应用程序含加密

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！");
}
}}