高级编程：三重DES加密程序(1)

public class FileEncrypter extends JFrame{ public static final int WIDTH = 550; 
public static final int HEIGHT = 200; 
public static void main(String args[]) {   
FileEncrypter fe = new FileEncrypter(); fe.show(); 
}  
FileEncrypter(){ 
this.setSize(WIDTH,HEIGHT); 
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
this.setResizable(false); 
Toolkit tk = Toolkit.getDefaultToolkit(); 
Dimension screenSize = tk.getScreenSize(); 
this.setLocation((screenSize.width - WIDTH)/2, (screenSize.height - HEIGHT)/2); 
this.setTitle("文件加密器(TriDES)"); 
Container c = this.getContentPane(); 
c.setLayout( new FlowLayout()); 
final FilePanel fp = new FilePanel("文件选择"); 
c.add(fp); 
final KeyPanel pp = new KeyPanel("密码"); 
c.add(pp); 
JButton jbE = new JButton("加密"); 
c.add(jbE); 
jbE.addActionListener(new ActionListener(){ 
public void actionPerformed(ActionEvent event){ 
File file = new File(fp.getFileName()); 
if (file.exists()) 
encrypt(file.getAbsoluteFile(),pp.getKey()); 
else 
JOptionPane.showMessageDialog( 
null,"请选择文件！","提示",JOptionPane.OK_OPTION); 
} 
}); 
JButton jbD = new JButton("解密"); 
c.add(jbD); 
jbD.addActionListener(new ActionListener(){ 
public void actionPerformed(ActionEvent event){ 
File file = new File(fp.getFileName()); 
if (file.exists()) 
decrypt(file.getAbsoluteFile(),pp.getKey()); 
else 
JOptionPane.showMessageDialog(null,"请选择文件！","提示",JOptionPane.OK_OPTION); 
} 
}); 
} 

private void encrypt(File fileIn,String sKey){ 
try{ 
if(sKey.length() == 48){ 
byte[] bytK1 = getKeyByStr(sKey.substring(0,16)); 
byte[] bytK2 = getKeyByStr(sKey.substring(16,32)); 
byte[] bytK3 = getKeyByStr(sKey.substring(32,48)); 
FileInputStream fis = new FileInputStream(fileIn); 
byte[] bytIn = new byte[(int)fileIn.length()]; 
for(int i = 0;i< fileIn.length();i++){ 
bytIn[i] = (byte)fis.read(); 
} 
//加密 
byte[] bytOut = encryptByDES(encryptByDES(encryptByDES(bytIn,bytK1),bytK2),bytK3); 
String fileOut = fileIn.getPath() + ".tdes"; 
FileOutputStream fos = new FileOutputStream(fileOut); 
for(int i = 0;i< bytOut.length;i++){ 
fos.write((int)bytOut[i]); 
} 
fos.close(); 
JOptionPane.showMessageDialog(this,"加密成功！","提示",JOptionPane.OK_OPTION); 
}else 
JOptionPane.showMessageDialog( 
this,"密码长度必须等于48！","错误信息",JOptionPane.ERROR_MESSAGE); 
}catch(Exception e){ 
e.printStackTrace(); 
} 
}