content: package priv.jesse.mall.utils;
  
  import sun.misc.BASE64Decoder;
  import sun.misc.BASE64Encoder;
  
  import javax.crypto.Cipher;
  import javax.crypto.SecretKey;
  import javax.crypto.SecretKeyFactory;
  import javax.crypto.spec.DESKeySpec;
  import java.io.IOException;
  import java.security.SecureRandom;
  
  /**
   * 加密解密工具类
   */
  public class DesUtil {
      private final static String DES = "DES";
  
      public static void main(String[] args) throws Exception {
          String data = "123 456";
          String key = "wow!@#$%";
          System.err.println(encrypt(data, key));
          System.err.println(decrypt(encrypt(data, key), key));
  
      }
  
      /**
       * Description 根据键值进行加密
       * @param data
       * @param key  加密键byte数组
       * @return
       * @throws Exception
       */
      public static String encrypt(String data, String key) throws Exception {
          byte[] bt = encrypt(data.getBytes(), key.getBytes());
          String strs = new BASE64Encoder().encode(bt);
          return strs;
      }
  
      /**
       * 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);
      }
  
      /**
       * Description 根据键值进行加密
       * @param data
       * @param key  加密键byte数组
       * @return
       * @throws Exception
       */
      private static byte[] encrypt(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对象实际完成加密操作
          Cipher cipher = Cipher.getInstance(DES);
  
          // 用密钥初始化Cipher对象
          cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
  
          return cipher.doFinal(data);
      }
  
  
      /**
       * 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);
      }
  }
  