HmacSHA256簽名驗簽

直接代碼：

public static String signWithHmacSHA256(String message, String secret) {
        if (StringUtils.isBlank(secret)) {
            return null;
        }
        try {
            Mac HmacSHA256 = Mac.getInstance("HmacSHA256");
            SecretKeySpec secret_key = new SecretKeySpec(secret.getBytes(CharsetUtil.UTF_8), "HmacSHA256");
            HmacSHA256.init(secret_key);
            message = URLEncoder.encode(message, "UTF-8");
            byte[] bytes = HmacSHA256.doFinal(message.getBytes(CharsetUtil.UTF_8));
            return Base64.encode(bytes);
        } catch (Exception e) {
            return null;
        }
    }