code: public static String Decryptor(String str) throws Exception {
          byte[] buff = EncrypDES.hexStr2ByteArr(str);
          // 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式
          Cipher c = getCipher();
          c.init(Cipher.DECRYPT_MODE, deskey);
          byte[] cipherByte = c.doFinal(buff);
          return new String(cipherByte);
      }
docs: 解密
  
  @param str
  @return
  @throws Exception