支付宝支付-扫码支付

1、场景介绍

扫码支付，指用户打开支付宝钱包中的“扫一扫”功能，扫描商户针对每个订单实时生成的订单二维码，并在手机端确认支付。

2、调用流程

1、商户系统调用支付宝预下单接口alipay.trade.precreate，获得该订单二维码图片地址。

3、使用SDK快速接入

3.1 需要使用到的接口

3.2 预下单接口alipay.trade.precreate封装

初始化SDK 上篇文章已提到过

static {
        alipayClient = new DefaultAlipayClient(serverUrl, appId, privateKey, format, charset, alipayPulicKey, signType);
    }

封装SDK的调用

/**
     * 扫码支付
     * 
     * @param notifyUrl 
     * @return
     * @throws AlipayApiException 
     */
    public static String tradePrecreatePay(AlipayTradePrecreateModel model, String notifyUrl) throws AlipayApiException{
        AlipayTradePrecreateResponse response = tradePrecreatePayToResponse(model,notifyUrl);
        return response.getBody();
    }
    public static AlipayTradePrecreateResponse tradePrecreatePayToResponse(AlipayTradePrecreateModel model, String notifyUrl) throws AlipayApiException{
        AlipayTradePrecreateRequest request = new AlipayTradePrecreateRequest();
        request.setBizModel(model);
        request.setNotifyUrl(notifyUrl);
        return alipayClient.execute(request);
    }

3.3 预下单接口alipay.trade.precreate测试

/**
     * 扫码支付
     */
    public void tradePrecreatePay() {
        String subject = "Javen 支付宝扫码支付测试";
        String totalAmount = "86";
        String storeId = "123";
        String notifyUrl = AliPayApi.NOTIFY_DOMAIN + "/alipay/precreate_notify_url";

        AlipayTradePrecreateModel model = new AlipayTradePrecreateModel();
        model.setSubject(subject);
        model.setTotalAmount(totalAmount);
        model.setStoreId(storeId);
        model.setTimeoutExpress("5m");
        model.setOutTradeNo(StringUtils.getOutTradeNo());
        try {
            String resultStr = AliPayApi.tradePrecreatePay(model, notifyUrl);
            JSONObject jsonObject = JSONObject.parseObject(resultStr);
            String qr_code = jsonObject.getJSONObject("alipay_trade_precreate_response").getString("qr_code");
            renderText(qr_code);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

返回的结果

{
  "alipay_trade_precreate_response": {
    "code": "10000",
    "msg": "Success",
    "out_trade_no": "050823252214942",
    "qr_code": 
  },
  "sign": "DIeOExAIIF4RhPsHLp4tZtQP15SU4k/CUsJ//Z782HOpTe/BYMK/YjiPv9I2JF6GHSIU+qotprO/unkwf1qN41d9g4qErx7oLpRLxGZgSOMo4js8wBcauN4osXmPRfmDvlCo6cO9s4rj3976223h/8kzBlRp3lpgOnD+uxyQrqqEsb6ddQosbEiqYW3XADu3X9GRTuDaJFsk4tkc1Uly6Mx17SXJs7c49CA0ObLJZ5RsV8Wd55qDWc93FqOKClNikOnFc0QwvAPuLXyW4DFpfdqk4LlegGT33jdfzTuPFoXXnab/P6/dRRGd4ZW82lVAx4pjGhia4Ad+Wb+sNf5QVw=="
}

4、扫码支付异步通知

/**
     * 扫码支付通知
     */
    public void precreate_notify_url(){
        try {
            Map<String, String> map = AliPayApi.toMap(getRequest());
            for (Map.Entry<String, String> entry : map.entrySet()) {
                System.out.println(entry.getKey()+" = "+entry.getValue());
            }
            boolean flag = AlipaySignature.rsaCheckV1(map, AliPayApi.ALIPAY_PUBLIC_KEY, AliPayApi.CHARSET,
                    AliPayApi.SIGN_TYPE);
            if (flag) {
                // TODO
                System.out.println("precreate_notify_url success");
                renderText("success");
                return;
            } else {
                // TODO
                System.out.println("precreate_notify_url failure");
                renderText("failure");
            }
        } catch (AlipayApiException e) {
            e.printStackTrace();
            renderText("failure");
        }
    }

将异步通知的参数转化为Map

/**
     * 将异步通知的参数转化为Map
     * @param request
     * @return
     */
    public static Map<String, String> toMap(HttpServletRequest request) {
        System.out.println(">>>>" + request.getQueryString());
        Map<String, String> params = new HashMap<String, String>();
        Map<String, String[]> requestParams = request.getParameterMap();
        for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext();) {
            String name = (String) iter.next();
            String[] values = (String[]) requestParams.get(name);
            String valueStr = "";
            for (int i = 0; i < values.length; i++) {
                valueStr = (i == values.length - 1) ? valueStr + values[i] : valueStr + values[i] + ",";
            }
            // 乱码解决，这段代码在出现乱码时使用。
            // valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8");
            params.put(name, valueStr);
        }
        return params;
    }