// 从请求头中获取信息
        String wechatPaySerial  = request.getHeader("Wechatpay-Signature");
        System.out.println("wechatPaySerial"+wechatPaySerial);
        String wechatSignature = request.getHeader("Wechatpay-Serial");
        System.out.println("Wechatpay-Serial"+wechatSignature);
        String wechatpayNonce = request.getHeader("Wechatpay-Nonce");
        String wechatTimestamp = request.getHeader("Wechatpay-Timestamp");
//        String singType = request.getHeader("Wechatpay-Signature-Type");
        // 拿到请求体body
        StringBuilder requestBody = null;
        try {
            //读取请求体的信息
            ServletInputStream inputStream = request.getInputStream();
//            StringBuffer stringBuffer = new StringBuffer();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));

            requestBody = new StringBuilder();
            String line;
//            BufferedReader reader;
//            reader = request.getReader();
            while (null != (line = bufferedReader.readLine())) {
                requestBody.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("body"+requestBody);

        // 构造 RequestParam
        // 构造 RequestParam
        RequestParam requestParam = new RequestParam.Builder()
                .serialNumber(wechatPaySerial)
                .nonce(wechatpayNonce)
                .signature(wechatSignature)
                .timestamp(wechatTimestamp)
                .body(requestBody.toString())
                .build();
        System.out.println("requestParam"+requestParam);

        // 如果已经初始化了 RSAAutoCertificateConfig，可直接使用
        // 没有的话，则构造一个
//        NotificationConfig config = new RSAAutoCertificateConfig.Builder()
//                .merchantId(merchantId)
//                .privateKeyFromPath(privateKeyPath)
//                .merchantSerialNumber(merchantSerialNumber)
//                .apiV3Key(apiV3Key)
//                .build();

        // 初始化 NotificationParser
        NotificationParser parser = new NotificationParser((NotificationConfig) getConfig());

        try {
            // 以支付通知回调为例，验签、解密并转换成 Transaction
            System.out.println("开始回调！");
            Transaction transaction = parser.parse(requestParam, Transaction.class);
            System.out.println("transaction"+transaction);
        } catch (ValidationException e) {
            // 签名验证失败，返回 401 UNAUTHORIZED 状态码
            logger.error("sign verification failed", e);

}