加密文件java代码 java文件加密与解密

谁能提供下java中有关加密和解密的代码

public static void main(String[] args) throws Exception {  

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String data = "itxxz";  

System.out.println("字符串：itxxz");  

System.err.println("加密："+encrypt(data));  

System.err.println("解密："+decrypt(encrypt(data)));  

}

运行结果：

由于代码太多，可到  itxxz.com/a/javashili/2014/1217/encrypt_decrypt.html  查看，注释也比较完整，清晰易懂

用java实现文件加密，帮忙修改下代码

这个应该和你的文件内容有关,你文件里不是数字的,你用nextInt就会出错.

你文件里是下边的内容你试一下

111111

2222

333

444

java用io怎么对文件进行加密？代码！！

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.io.*;

import java.security.*;

import javax.crypto.*;

import javax.crypto.spec.*;

/**

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 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);

}

});

}

/**

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;iFILEIN.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;iBYTOUT.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;iFILEIN.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;iBYTOUT.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;iSTR.LENGTH()

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;iBYT.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;

}

}

java加密解密代码

package com.cube.limail.util;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;/**

* 加密解密类

*/

public class Eryptogram

{

private static String Algorithm ="DES";

private String key="CB7A92E3D3491964";

//定义 加密算法,可用 DES,DESede,Blowfish

static boolean debug = false ;

/**

* 构造子注解.

*/

public Eryptogram ()

{

} /**

* 生成密钥

* @return byte[] 返回生成的密钥

* @throws exception 扔出异常.

*/

public static byte [] getSecretKey () throws Exception

{

KeyGenerator keygen = KeyGenerator.getInstance (Algorithm );

SecretKey deskey = keygen.generateKey ();

System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));

if (debug ) System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));

return deskey.getEncoded ();

} /**

* 将指定的数据根据提供的密钥进行加密

* @param input 需要加密的数据

* @param key 密钥

* @return byte[] 加密后的数据

* @throws Exception

*/

public static byte [] encryptData (byte [] input ,byte [] key ) throws Exception

{

SecretKey deskey = new javax.crypto.spec.SecretKeySpec (key ,Algorithm );

if (debug )

{

System.out.println ("加密前的二进串:"+byte2hex (input ));

System.out.println ("加密前的字符串:"+new String (input ));

} Cipher c1 = Cipher.getInstance (Algorithm );

c1.init (Cipher.ENCRYPT_MODE ,deskey );

byte [] cipherByte =c1.doFinal (input );

if (debug ) System.out.println ("加密后的二进串:"+byte2hex (cipherByte ));

return cipherByte ;

} /**

* 将给定的已加密的数据通过指定的密钥进行解密

* @param input 待解密的数据

* @param key 密钥

* @return byte[] 解密后的数据

* @throws Exception

*/

public static byte [] decryptData (byte [] input ,byte [] key ) throws Exception

{

SecretKey deskey = new javax.crypto.spec.SecretKeySpec (key ,Algorithm );

if (debug ) System.out.println ("解密前的信息:"+byte2hex (input ));

Cipher c1 = Cipher.getInstance (Algorithm );

c1.init (Cipher.DECRYPT_MODE ,deskey );

byte [] clearByte =c1.doFinal (input );

if (debug )

{

System.out.println ("解密后的二进串:"+byte2hex (clearByte ));

System.out.println ("解密后的字符串:"+(new String (clearByte )));

} return clearByte ;

} /**

* 字节码转换成16进制字符串

* @param byte[] b 输入要转换的字节码

* @return String 返回转换后的16进制字符串

*/

public static String byte2hex (byte [] b )

{

String hs ="";

String stmp ="";

for (int n =0 ;n b.length ;n ++)

{

stmp =(java.lang.Integer.toHexString (b [n ] 0XFF ));

if (stmp.length ()==1 ) hs =hs +"0"+stmp ;

else hs =hs +stmp ;

if (n b.length -1 ) hs =hs +":";

} return hs.toUpperCase ();

}

/**

* 字符串转成字节数组.

* @param hex 要转化的字符串.

* @return byte[] 返回转化后的字符串.

*/

public static byte[] hexStringToByte(String hex) {

int len = (hex.length() / 2);

byte[] result = new byte[len];

char[] achar = hex.toCharArray();

for (int i = 0; i len; i++) {

int pos = i * 2;

result[i] = (byte) (toByte(achar[pos]) 4 | toByte(achar[pos + 1]));

}

return result;

}

private static byte toByte(char c) {

byte b = (byte) "0123456789ABCDEF".indexOf(c);

return b;

}

/**

* 字节数组转成字符串.

* @param String 要转化的字符串.

* @return 返回转化后的字节数组.

*/

public static final String bytesToHexString(byte[] bArray) {

StringBuffer sb = new StringBuffer(bArray.length);

String sTemp;

for (int i = 0; i bArray.length; i++) {

sTemp = Integer.toHexString(0xFF bArray[i]);

if (sTemp.length() 2)

sb.append(0);

sb.append(sTemp.toUpperCase());

}

return sb.toString();

}

/**

* 从数据库中获取密钥.

* @param deptid 企业id.

* @return 要返回的字节数组.

* @throws Exception 可能抛出的异常.

*/

public static byte[] getSecretKey(long deptid) throws Exception {

byte[] key=null;

String value=null;

//CommDao dao=new CommDao();

// List list=dao.getRecordList("from Key k where k.deptid="+deptid);

//if(list.size()0){

//value=((com.csc.sale.bean.Key)list.get(0)).getKey();

value = "CB7A92E3D3491964";

key=hexStringToByte(value);

//}

if (debug)

System.out.println("密钥:" + value);

return key;

}

public String encryptData2(String data) {

String en = null;

try {

byte[] key=hexStringToByte(this.key);

en = bytesToHexString(encryptData(data.getBytes(),key));

} catch (Exception e) {

e.printStackTrace();

}

return en;

}

public String decryptData2(String data) {

String de = null;

try {

byte[] key=hexStringToByte(this.key);

de = new String(decryptData(hexStringToByte(data),key));

} catch (Exception e) {

e.printStackTrace();

}

return de;

}

} 加密使用： byte[] key=Eryptogram.getSecretKey(deptid); //获得钥匙（字节数组）

byte[] tmp=Eryptogram.encryptData(password.getBytes(), key); //传入密码和钥匙，获得加密后的字节数组的密码

password=Eryptogram.bytesToHexString(tmp); //将字节数组转化为字符串，获得加密后的字符串密码解密与之差不多

用java写个文件加密的代码该怎么写

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.io.*;

import java.security.*;

import javax.crypto.*;

import javax.crypto.spec.*;

/**

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 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);

}

});

}

/**

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;iFILEIN.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;iBYTOUT.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;iFILEIN.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;iBYTOUT.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;iSTR.LENGTH()

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;iBYT.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;

}

}

JAVA简单文件加密 求JAVA源代码

md5加密：

package com.ncs.pki.util;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

public class MD5Test {

private static MessageDigest digest = null;

public synchronized static final String hash(String data) {

if (digest == null) {

try {

digest = MessageDigest.getInstance("MD5");

} catch (NoSuchAlgorithmException nsae) {

System.err.println(

"Failed to load the MD5 MessageDigest. "

+ "Jive will be unable to function normally.");

nsae.printStackTrace();

}

}

// Now, compute hash.

digest.update(data.getBytes());

return encodeHex(digest.digest());

}

public static final String encodeHex(byte[] bytes) {

StringBuffer buf = new StringBuffer(bytes.length * 2);

int i;

for (i = 0; i bytes.length; i++) {

if (((int) bytes[i] 0xff) 0x10) {

buf.append("0");

}

buf.append(Long.toString((int) bytes[i] 0xff, 16));

}

return buf.toString();

}

public static String test(){

return null;

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

System.out.println(MD5Test.hash("123456"));

}

}

3des加密：

package com.ncs.pki.util;

import java.security.Key;

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

public class DesEncrypt {

/**

*

* 使用DES加密与解密,可对byte[],String类型进行加密与解密 密文可使用String,byte[]存储.

*

* 方法: void getKey(String strKey)从strKey的字条生成一个Key

*

* String getEncString(String strMing)对strMing进行加密,返回String密文 String

* getDesString(String strMi)对strMin进行解密,返回String明文

*

*byte[] getEncCode(byte[] byteS)byte[]型的加密 byte[] getDesCode(byte[]

* byteD)byte[]型的解密

*/

Key key;

/**

* 根据参数生成KEY

*

* @param strKey

*/

public void getKey(String strKey) {

try {

KeyGenerator _generator = KeyGenerator.getInstance("DES");

_generator.init(new SecureRandom(strKey.getBytes()));

this.key = _generator.generateKey();

_generator = null;

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 加密String明文输入,String密文输出

*

* @param strMing

* @return

*/

public String getEncString(String strMing) {

byte[] byteMi = null;

byte[] byteMing = null;

String strMi = "";

BASE64Encoder base64en = new BASE64Encoder();

try {

byteMing = strMing.getBytes("UTF8");

byteMi = this.getEncCode(byteMing);

strMi = base64en.encode(byteMi);

} catch (Exception e) {

e.printStackTrace();

} finally {

base64en = null;

byteMing = null;

byteMi = null;

}

return strMi;

}

/**

* 解密 以String密文输入,String明文输出

*

* @param strMi

* @return

*/

public String getDesString(String strMi) {

BASE64Decoder base64De = new BASE64Decoder();

byte[] byteMing = null;

byte[] byteMi = null;

String strMing = "";

try {

byteMi = base64De.decodeBuffer(strMi);

byteMing = this.getDesCode(byteMi);

strMing = new String(byteMing, "UTF8");

} catch (Exception e) {

e.printStackTrace();

} finally {

base64De = null;

byteMing = null;

byteMi = null;

}

return strMing;

}

/**

* 加密以byte[]明文输入,byte[]密文输出

*

* @param byteS

* @return

*/

private byte[] getEncCode(byte[] byteS) {

byte[] byteFina = null;

Cipher cipher;

try {

cipher = Cipher.getInstance("DES");

cipher.init(Cipher.ENCRYPT_MODE, key);

byteFina = cipher.doFinal(byteS);

} catch (Exception e) {

e.printStackTrace();

} finally {

cipher = null;

}

return byteFina;

}

/**

* 解密以byte[]密文输入,以byte[]明文输出

*

* @param byteD

* @return

*/

private byte[] getDesCode(byte[] byteD) {

Cipher cipher;

byte[] byteFina = null;

try {

cipher = Cipher.getInstance("DES");

cipher.init(Cipher.DECRYPT_MODE, key);

byteFina = cipher.doFinal(byteD);

} catch (Exception e) {

e.printStackTrace();

} finally {

cipher = null;

}

return byteFina;

}

public static void main(String[] args) {

System.out.println("des demo");

DesEncrypt des = new DesEncrypt();// 实例化一个对像

des.getKey("MYKEY");// 生成密匙

System.out.println("key=MYKEY");

String strEnc = des.getEncString("111111");// 加密字符串,返回String的密文

System.out.println("密文=" + strEnc);

String strDes = des.getDesString(strEnc);// 把String 类型的密文解密

System.out.println("明文=" + strDes);

}

}