提前声明一下:此工具类忘记出处了，很抱歉，如果原创遇上了我立马上您的链接：

加密解密的工具类DataEncryptUtil：

     

package org.util;import java.security.MessageDigest;  import javax.crypto.KeyGenerator;  
import javax.crypto.Mac;  
import javax.crypto.SecretKey;  
import javax.crypto.spec.SecretKeySpec;  import sun.misc.BASE64Decoder;  
import sun.misc.BASE64Encoder;  /** * data encrypt utls * * @author skyline * */  
public class DataEncryptUtil {  public static final String KEY_SHA = "SHA";  public static final String KEY_MD5 = "MD5";  /** * MAC算法可选以下多种算法 * * <pre> * HmacMD5 * HmacSHA1 * HmacSHA256 * HmacSHA384 * HmacSHA512 * </pre> */  public static final String KEY_MAC = "HmacMD5";  /** * BASE64解密 * * @param key = 需要解密的密码字符串 * @return * @throws Exception */  public static byte[] decryptBASE64(String key) throws Exception {  return (new BASE64Decoder()).decodeBuffer(key);  }  /** * BASE64加密 * * @param key = 需要加密的字符数组 * @return * @throws Exception */  public static String encryptBASE64(byte[] key) throws Exception {  return (new BASE64Encoder()).encodeBuffer(key);  }  /** * MD5加密 * * @param data = 需要加密的字符数组 * @return * @throws Exception */  public static byte[] encryptMD5(byte[] data) throws Exception {  MessageDigest md5 = MessageDigest.getInstance(KEY_MD5);  md5.update(data);  return md5.digest();  }  /** * SHA加密 * * @param data = 需要加密的字符数组 * @return * @throws Exception */  public static byte[] encryptSHA(byte[] data) throws Exception {  MessageDigest sha = MessageDigest.getInstance(KEY_SHA);  sha.update(data);  return sha.digest();  }  /** * 初始化HMAC密钥 * * @return * @throws Exception */  public static String initMacKey() throws Exception {  KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);  SecretKey secretKey = keyGenerator.generateKey();  return encryptBASE64(secretKey.getEncoded());  }  /** * HMAC加密 * * @param data = 密匙加密过的字符数组 * @param key = 需要加密的字符串 * @return * @throws Exception */  public static byte[] encryptHMAC(byte[] data, String key) throws Exception {  SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);  Mac mac = Mac.getInstance(secretKey.getAlgorithm());  mac.init(secretKey);  return mac.doFinal(data);  }  }