java工具类按环境读取配置

@Slf4j
@Component
public class AESUtil {

    private static final String KEY_ALGORITHM = "AES";
    private static String DEFAULT_CIPHER_ALGORITHM ;
    private static String KEY;
    private static String IV;

    @Autowired
    private Environment env;

    private AESUtil() {
    }

    @PostConstruct
    public void init() {
        KEY = env.getProperty("emmp.aesencrypt.key");
        IV = env.getProperty("emmp.aesencrypt.iv");
        DEFAULT_CIPHER_ALGORITHM = env.getProperty("emmp.aesencrypt.defaultPadding");
    }

    
    public static byte[] encrypt(String content, String key, String iv) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM, new BouncyCastleProvider());
            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), KEY_ALGORITHM);
            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
            cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivParameterSpec);
            byte[] byteContent = content.getBytes(StandardCharsets.UTF_8);
            return cipher.doFinal(byteContent);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        }

        return new byte[0];
    }

    
    public static String decrypt(byte[] content, String key, String iv) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM, new BouncyCastleProvider());
            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), KEY_ALGORITHM);
            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivParameterSpec);
            byte[] result = cipher.doFinal(content);
            return new String(result, StandardCharsets.UTF_8);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
        }
        return null;
    }

    public static String getDecode(String content) {
        String decrypt;
        try {
            byte[] bytes = Hex.decodeHex(content);
            decrypt = decrypt(bytes, getKey(), getIv());
            return decrypt;
        } catch (DecoderException e) {
            log.error("加密内容转换失败:" + e.getMessage());
            decrypt = content;
        }
        return decrypt;
    }


    private static String getKey() {
        return KEY;
    }

    private static String getIv() {
        return IV;
    }

}