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玩转小程序支付之支付结果通知

玩转小程序支付之支付结果通知

作者: 就叫小木木呀 | 来源:发表于2019-05-28 16:16 被阅读1次

    上一篇讲了小程序支付的过程,接下来就是支付结果通知

    官方文档:https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=9_7

    注意: 

    支付通知的url 是通过【统一下单API】中提交的参数notify_url设置,如果链接无法访问,商户将无法接收到微信通知。

    通知url必须为直接可访问的url,不能携带参数。示例:notify_url:“https://pay.weixin.qq.com/wxpay/pay.action”

    在前面的支付的参数中设置了支付结果的URL——baseUrl+"/notify"

    支付时传的回调地址

    所以支付通知会发到我自己服务器下的这个路径下,会接收到类似如下的xml字符串(如果正常的话,即result_code 和return_code都为SUCCESS)

    微信支付通知内容

    解析这个xml,可以得到transaction_id,out_trade_no等关键信息。

    为了保证返回信息是否正确,我们可以去验证其正确性。

    方法是对参数进行加密获取的签名,然后比对返回的签名和我们生成的签名是否一致,若不一致就表明返回的支付通知被修改,不过一般不会出现这种情况。

    注意:

     可能是微信方面觉得一次不一定能通知到,所以支付通知可能会发多次,所以我们在收到正确的通知之后,需要给小程序官方返回一段xml,表示收到,之后就不会再收到啦。

    返回给微信支付的确认内容

    整个支付通知的处理的代码如下

    /**

         * 支付完成通知

         * @param request

         * @param response

         * @return

         * @throws Exception

         */

        @RequestMapping(value = "/notify",method = RequestMethod.POST)

        public String notify(HttpServletRequest request, HttpServletResponse response) throws Exception {

            BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream()));

            String line = null;

            StringBuilder sb = new StringBuilder();

            while((line = br.readLine())!=null){

                sb.append(line);

            }

            //解析并给微信发回收到通知确认

            Map map =  PayUtils.doXMLParse(sb.toString());

            String returnCode = map.get("return_code").toString();

            if(returnCode.equals("SUCCESS")){

                String resultCode = map.get("result_code").toString();

                if(resultCode.equals("SUCCESS")){

                    SortedMap packageParams = new TreeMap<String, String>();

                    packageParams.put("appid", map.get("appid").toString());

                    packageParams.put("attach", map.get("attach").toString());

                    packageParams.put("bank_type", map.get("bank_type").toString());

                    packageParams.put("cash_fee", map.get("cash_fee").toString());

                    packageParams.put("fee_type", map.get("fee_type").toString());

                    packageParams.put("is_subscribe", map.get("is_subscribe").toString());

                    packageParams.put("mch_id", map.get("mch_id").toString());

                    packageParams.put("nonce_str", map.get("nonce_str").toString());

                    packageParams.put("openid", map.get("openid").toString());

                    packageParams.put("out_trade_no", map.get("out_trade_no").toString());

                    packageParams.put("result_code", map.get("result_code").toString());

                    packageParams.put("return_code", map.get("return_code").toString());

                    packageParams.put("time_end", map.get("time_end").toString());

                    packageParams.put("total_fee", map.get("total_fee").toString());

                    packageParams.put("trade_type", map.get("trade_type").toString());

                    packageParams.put("transaction_id", map.get("transaction_id").toString());

                    String sign = PayUtils.createSign(packageParams,key);

                    String originSign = map.get("sign").toString();

                    if(sign.equals(originSign)){

                        //签名一致,保存支付流水

                        String xml="<xml>"

                                  +"<return_code>SUCCESS</return_code>"

                                  +"<return_msg>OK</return_msg>"

                                  +"</xml>";

                        ProfPayLog payLog = new ProfPayLog();

                        payLog.setCreatedAt(new Date());

                        payLog.setSource(Source.WeiXin);

                        DecimalFormat df = new DecimalFormat("######0.00");

                        payLog.setTotalFee(String.valueOf(df.format((Double.valueOf(map.get("total_fee").toString())/100))));

                        payLog.setTradeNo(map.get("out_trade_no").toString());

                        payLog.setTransactionId(map.get("transaction_id").toString());

                        String attach = map.get("attach").toString();//userId+"#wx#"+activityId

                        payLog.setUserId(attach.split("#wx#")[0]);

                        payLog.setType(ProfPayLog.Type.Pay);

                        WxappUser user = wxappUserService.find(Long.valueOf(attach.split("#wx#")[0]));

                        WxappActivity activity = wxappActivityService.find(Long.valueOf(attach.split("#wx#")[1]));

                        WxappActivityApply activityApply = wxappActivityApplyService.findActivityApplyByUserAndActivity(user, activity);

                        if(activityApply.getPayLogId() != null){

                            System.out.println("=========已经完成了存储支付流水=========");

                            return xml;

                        }else{

                            System.out.println("=========完成第一次保存支付流水=========");

                            payLog = wxappPayService.save(payLog);

                            //在活动申请表中关联上支付流水的id

                            activityApply.setPayLogId(String.valueOf(payLog.getId()));

                            wxappActivityApplyService.save(activityApply);

                            return xml;

                        }

                    }else{

                        String xml="<xml>"

                                  +"<return_code>FAIL</return_code>"

                                  +"<return_msg>签名不一致</return_msg>"

                                  +"</xml>";

                        return xml;

                    }

                }else{

                    String xml="<xml>"

                              +"<return_code>FAIL</return_code>"

                              +"<return_msg>支付通知失败</return_msg>"

                              +"</xml>";

                            return xml;

                }

            } else {

                String xml="<xml>"

                      +"<return_code>FAIL</return_code>"

                      +"<return_msg>支付通知失败</return_msg>"

                      +"</xml>";

                    return xml;

            }

        }

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