java文本文件加密解密类，java加密解密,import java.
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java文本文件加密解密类，java加密解密,import java.
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; }}
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