import java.awt.*;  import java.awt.event.*;  import javax.swing.*;  import java.io.*;  import java.security.*;  import javax.crypto.*;  import javax.crypto.spec.*;    /**   * 文本文件加密解密类   *   * 文件名：FileEncrypter.java JDK：1.40以上 说明：文件加密 加密方法：三重DES加密   * 加密过程：对选中的文件加密后在同文件夹下生成一个增加了".tdes" 扩展名的加密文件   *   * 解密过程：对选中的加密文件（必须有".tdes"扩展名）进行解密   */  public class Test extends JFrame  {   public static final int WIDTH = 550;   public static final int HEIGHT = 200;     public static void main ( String args[] )   {    Test fe = new Test();    fe.show();   }     Test()   {    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 );     }    } );   }     /**    * 加密函数 输入： 要加密的文件，密码（由0-F组成，共48个字符，表示3个8位的密码）如：    * AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746 其中： AD67EA2F3BE6E5AD    * DES密码一 D368DFE03120B5DF DES密码二 92A8FD8FEC2F0746 DES密码三 输出：    * 对输入的文件加密后，保存到同一文件夹下增加了".tdes"扩展名的文件中。    */   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();    }   }     /**    * 解密函数 输入： 要解密的文件，密码（由0-F组成，共48个字符，表示3个8位的密码）如：    * AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746 其中： AD67EA2F3BE6E5AD    * DES密码一 D368DFE03120B5DF DES密码二 92A8FD8FEC2F0746 DES密码三 输出：    * 对输入的文件解密后，保存到用户指定的文件中。    */   private void decrypt ( File fileIn, String sKey )   {    try    {     if ( sKey.length() == 48 )     {      String strPath = fileIn.getPath();      if ( strPath.substring ( strPath.length() - 5 ).toLowerCase()              .equals ( ".tdes" ) )       strPath = strPath.substring ( 0, strPath.length() - 5 );      else      {       JOptionPane.showMessageDialog ( this, "不是合法的加密文件！", "提示",                                       JOptionPane.OK_OPTION );       return;      }      JFileChooser chooser = new JFileChooser();      chooser.setCurrentDirectory ( new File ( "." ) );      chooser.setSelectedFile ( new File ( strPath ) );      // 用户指定要保存的文件      int ret = chooser.showSaveDialog ( this );      if ( ret == JFileChooser.APPROVE_OPTION )      {         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();       }       // 解密       byte[] bytOut = decryptByDES (                           decryptByDES ( decryptByDES ( bytIn, bytK3 ), bytK2 ),                           bytK1 );       File fileOut = chooser.getSelectedFile();       fileOut.createNewFile();       FileOutputStream fos = new FileOutputStream ( fileOut );       for ( int i = 0; i < bytOut.length; i++ )       {        fos.write ( ( int ) bytOut[i] );       }       fos.close();       JOptionPane.showMessageDialog ( this, "解密成功！", "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 )    {     JOptionPane.showMessageDialog ( this, "解密失败，请核对密码！", "提示",                                     JOptionPane.OK_OPTION );    }   }     /**    * 用DES方法加密输入的字节 bytKey需为8字节长，是加密的密码    */   private byte[] encryptByDES ( byte[] bytP, byte[] bytKey ) throws Exception   {    DESKeySpec desKS = new DESKeySpec ( bytKey );    SecretKeyFactory skf = SecretKeyFactory.getInstance ( "DES" );    SecretKey sk = skf.generateSecret ( desKS );    Cipher cip = Cipher.getInstance ( "DES" );    cip.init ( Cipher.ENCRYPT_MODE, sk );    return cip.doFinal ( bytP );   }     /**    * 用DES方法解密输入的字节 bytKey需为8字节长，是解密的密码    */   private byte[] decryptByDES ( byte[] bytE, byte[] bytKey ) throws Exception   {    DESKeySpec desKS = new DESKeySpec ( bytKey );    SecretKeyFactory skf = SecretKeyFactory.getInstance ( "DES" );    SecretKey sk = skf.generateSecret ( desKS );    Cipher cip = Cipher.getInstance ( "DES" );    cip.init ( Cipher.DECRYPT_MODE, sk );    return cip.doFinal ( bytE );   }     /**    * 输入密码的字符形式，返回字节数组形式。 如输入字符串：AD67EA2F3BE6E5AD 返回字节数组：{    * 173,103,234,47,59,230,229,173 }    */   private byte[] getKeyByStr ( String str )   {    byte[] bRet = new byte[str.length() / 2];    for ( int i = 0; i < str.length() / 2; i++ )    {     Integer itg = new Integer ( 16 * getChrInt ( str.charAt ( 2 * i ) )                                 + getChrInt ( str.charAt ( 2 * i + 1 ) ) );     bRet[i] = itg.byteValue();    }    return bRet;   }     /**    * 计算一个16进制字符的10进制值 输入：0-F    */   private int getChrInt ( char chr )   {    int iRet = 0;    if ( chr == "0".charAt ( 0 ) )     iRet = 0;    if ( chr == "1".charAt ( 0 ) )     iRet = 1;    if ( chr == "2".charAt ( 0 ) )     iRet = 2;    if ( chr == "3".charAt ( 0 ) )     iRet = 3;    if ( chr == "4".charAt ( 0 ) )     iRet = 4;    if ( chr == "5".charAt ( 0 ) )     iRet = 5;    if ( chr == "6".charAt ( 0 ) )     iRet = 6;    if ( chr == "7".charAt ( 0 ) )     iRet = 7;    if ( chr == "8".charAt ( 0 ) )     iRet = 8;    if ( chr == "9".charAt ( 0 ) )     iRet = 9;    if ( chr == "A".charAt ( 0 ) )     iRet = 10;    if ( chr == "B".charAt ( 0 ) )     iRet = 11;    if ( chr == "C".charAt ( 0 ) )     iRet = 12;    if ( chr == "D".charAt ( 0 ) )     iRet = 13;    if ( chr == "E".charAt ( 0 ) )     iRet = 14;    if ( chr == "F".charAt ( 0 ) )     iRet = 15;    return iRet;   }  }    /**   * 文件选择组件。   */  class FilePanel extends JPanel  {   FilePanel ( String str )   {    JLabel label = new JLabel ( str );    JTextField fileText = new JTextField ( 35 );    JButton chooseButton = new JButton ( "浏览..." );    this.add ( label );    this.add ( fileText );    this.add ( chooseButton );    clickAction ca = new clickAction ( this );    chooseButton.addActionListener ( ca );     }     public String getFileName()   {    JTextField jtf = ( JTextField ) this.getComponent ( 1 );    return jtf.getText();   }     private class clickAction implements ActionListener   {    clickAction ( Component c )    {     cmpt = c;    }      public void actionPerformed ( ActionEvent event )    {     JFileChooser chooser = new JFileChooser();     chooser.setCurrentDirectory ( new File ( "." ) );     int ret = chooser.showOpenDialog ( cmpt );     if ( ret == JFileChooser.APPROVE_OPTION )     {      JPanel jp = ( JPanel ) cmpt;      JTextField jtf = ( JTextField ) jp.getComponent ( 1 );      jtf.setText ( chooser.getSelectedFile().getPath() );     }    }      private Component cmpt;   }  }    /**   * 密码生成组件。   */  class KeyPanel extends JPanel  {   KeyPanel ( String str )   {    JLabel label = new JLabel ( str );    JTextField fileText = new JTextField ( 35 );    JButton chooseButton = new JButton ( "随机产生" );    this.add ( label );    this.add ( fileText );    this.add ( chooseButton );    clickAction ca = new clickAction ( this );    chooseButton.addActionListener ( ca );     }     // 返回生成的密码（48个字符长度）   public String getKey()   {    JTextField jtf = ( JTextField ) this.getComponent ( 1 );    return jtf.getText();   }     private class clickAction implements ActionListener   {    clickAction ( Component c )    {     cmpt = c;    }      public void actionPerformed ( ActionEvent event )    {     try     {      KeyGenerator kg = KeyGenerator.getInstance ( "DES" );      kg.init ( 56 );      Key ke = kg.generateKey();      byte[] bytK1 = ke.getEncoded();      ke = kg.generateKey();      byte[] bytK2 = ke.getEncoded();      ke = kg.generateKey();      byte[] bytK3 = ke.getEncoded();        JPanel jp = ( JPanel ) cmpt;      JTextField jtf = ( JTextField ) jp.getComponent ( 1 );      jtf.setText ( getByteStr ( bytK1 ) + getByteStr ( bytK2 )                    + getByteStr ( bytK3 ) );     }     catch ( Exception e )     {      e.printStackTrace();     }    }      private String getByteStr ( byte[] byt )    {     String strRet = "";     for ( int i = 0; i < byt.length; i++ )     {      // System.out.println(byt[i]);      strRet += getHexValue ( ( byt[i] & 240 ) / 16 );      strRet += getHexValue ( byt[i] & 15 );     }     return strRet;    }      private String getHexValue ( int s )    {     String sRet = null;     switch ( s )     {     case 0:      sRet = "0";      break;     case 1:      sRet = "1";      break;     case 2:      sRet = "2";      break;     case 3:      sRet = "3";      break;     case 4:      sRet = "4";      break;     case 5:      sRet = "5";      break;     case 6:      sRet = "6";      break;     case 7:      sRet = "7";      break;     case 8:      sRet = "8";      break;     case 9:      sRet = "9";      break;     case 10:      sRet = "A";      break;     case 11:      sRet = "B";      break;     case 12:      sRet = "C";      break;     case 13:      sRet = "D";      break;     case 14:      sRet = "E";      break;     case 15:      sRet = "F";     }     return sRet;    }      private Component cmpt;   }  }