public class CipherUtils {
  /**
  * 密钥算法
  */
  private static final String ALGORITHM = "AES";
  /**
  * 加解密算法/工作模式/填充方式
  */
  private static final String ALGORITHM_STR = "AES/ECB/PKCS5Padding";
  /**
  * SecretKeySpec类是KeySpec接口的实现类,用于构建秘密密钥规范
  */
  private SecretKeySpec key;
  public CipherUtils(String hexKey) {
  key = new SecretKeySpec(hexKey.getBytes(), ALGORITHM);
  }
  /**
  * AES加密
  * 
  * @param data
  * @return
  */
  public String encryptData(String data) {
  try {
    Cipher cipher = Cipher.getInstance(ALGORITHM_STR); // 创建密码器
    cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
    return new BASE64Encoder().encode(cipher.doFinal(data.getBytes("utf-8")));
  } catch (Exception e) {
    e.printStackTrace();
    return null;
  }
  }
  /**
  * AES解密
  * 
  * @param data
  * @return
  */
  public String decryptData(String data) {
  try {
    Cipher cipher = Cipher.getInstance(ALGORITHM_STR);
    cipher.init(Cipher.DECRYPT_MODE, key);
    return new String(cipher.doFinal(new BASE64Decoder().decodeBuffer(data)), "utf-8");
  } catch (Exception e) {
    e.printStackTrace();
    return null;
  }
  }
}