废话不多说，直接奉上代码：

复制代码 代码如下:

package com.eabax.plugin.yundada.utils;

import java.io.IOException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import java.security.spec.InvalidKeySpecException;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.binary.Base64;

import sun.misc.BASE64Decoder;

public class DESEncryptHelper {

private final static String DES = "DES";

/**

* 生成密钥

* @param employeeCode

*/

public static String getDESKey(String encryptStr){

if (!CacheManager.getCache().containsKey("encryptKey_"+encryptStr)) {

CacheManager.getCache().put("encryptKey_"+encryptStr, encryptStr+"tablemiyaokey");

}

String key = (String) CacheManager.getCache().get("encryptKey_"+encryptStr);

return key;

}

/**

* Description 根据键值进行解密

* @param data

* @param key 加密键byte数组

* @return

* @throws IOException

* @throws Exception

*/

public static String decrypt(String data, String key) throws IOException,

Exception {

if (data == null)

return null;

BASE64Decoder decoder = new BASE64Decoder();

byte[] buf = decoder.decodeBuffer(data);

byte[] bt = decrypt(buf,key.getBytes());

return new String(bt);

}

/**

* 对字符串加密

* @param str

* @return

* @throws InvalidKeyException

* @throws IllegalBlockSizeException

* @throws BadPaddingException

* @throws InvalidKeySpecException

* @throws NoSuchAlgorithmException

* @throws NoSuchPaddingException

*/

public static String getEncryptStr(String str,String encryptStr) throws InvalidKeyException,

IllegalBlockSizeException, BadPaddingException,

InvalidKeySpecException, NoSuchAlgorithmException,

NoSuchPaddingException {

//获取key

String key = getDESKey(encryptStr);

//获取密钥

SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");

DESKeySpec keyspec = new DESKeySpec(key.getBytes());

SecretKey deskey = factory.generateSecret(keyspec);

// Cipher负责完成加密或解密工作

Cipher c = Cipher.getInstance("DES");

// 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式

c.init(Cipher.ENCRYPT_MODE, deskey);

byte[] src = str.getBytes();

// 该字节数组负责保存加密的结果

byte[] cipherByte = c.doFinal(src);

String enstr = new String(Base64.encodeBase64(cipherByte));

return enstr;

}

/**

* Description 根据键值进行解密

* @param data

* @param key 加密键byte数组

* @return

* @throws Exception

*/

private static byte[] decrypt(byte[] data, byte[] key) throws Exception {

// 生成一个可信任的随机数源

SecureRandom sr = new SecureRandom();

// 从原始密钥数据创建DESKeySpec对象

DESKeySpec dks = new DESKeySpec(key);

// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

SecretKey securekey = keyFactory.generateSecret(dks);

// Cipher对象实际完成解密操作

Cipher cipher = Cipher.getInstance(DES);

// 用密钥初始化Cipher对象

cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

return cipher.doFinal(data);

}

}

以上就是本文关于DES加密解密的代码了，希望对大家学习java有所帮助。