1.5 微信Native支付 - 申请退款、查询退款、退款通知、账单

r囧r小猫 2024-02-19 10:16 30阅读 0赞

#### 文章目录 ####

*  用户退款
 *  一、 申请退款
 *   *  1.1 数据库表
     *  1.2 Controller
     *  1.3 Service
     *   *  1.3.1 创建退款单记录
         *  1.3.2 更新订单状态与更新退款单
         *  1.3.3 调用退款API
         *  1.3.4 效果图
 *  二、查询退款API
 *  三、退款结果通知
 *   *  3.1 Controller
     *  3.2 Service处理退款单
 *  四、账单
 *   *  4.1 申请账单API
     *  4.2 下载账单API

## 用户退款 ##

> 其实用户退款的流程和用户支付的流程是差不多的，所以可以参考支付的代码进行编写
> 
> [1.3 微信Native支付 -下单、定时查单、取消订单、签名-CSDN博客][1.3 _Native_ -_-CSDN]
> 
> [1.4 内网穿透与通知、查询用户订单-CSDN博客][1.4 _-CSDN]

## 一、 申请退款 ##

> [官方退款请求][Link 1]

![image-20231107110133398][]

### 1.1 数据库表 ###

![image-20231107134421565][]

![image-20231107134319712][]

@Data
    @TableName("t_refund_info")
    public class RefundInfo extends BaseEntity{
        
        private String orderNo;//商品订单编号
        private String refundNo;//退款单编号
        private String refundId;//支付系统退款单号
        private Integer totalFee;//原订单金额(分)
        private Integer refund;//退款金额(分)
        private String reason;//退款原因
        private String refundStatus;//退款单状态
        private String contentReturn;//申请退款返回参数
        private String contentNotify;//退款结果通知参数
    }

### 1.2 Controller ###

@ApiOperation("申请退款")
    @PostMapping("/refunds/{orderNo}/{reason}")
    public R refunds(@PathVariable String orderNo,@PathVariable String reason){
        
        log.info("申请亏款");
        wxPayService.refund(orderNo,reason);
        return R.ok();
    }

### 1.3 Service ###

#### 1.3.1 创建退款单记录 ####

log.info("创建退款单记录");
    //根据订单编号创建退款单
    RefundInfo refundsInfo = refundsInfoService.createRefundByOrderNo(orderNo, reason);

/**
     * 根据订单号创建退款订单
     * @param orderNo
     * @return
     */
    @Override
    public RefundInfo createRefundByOrderNo(String orderNo, String reason) {
        
    
        //根据订单号获取订单信息
        OrderInfo orderInfo = orderInfoService.getOrderByOrderNo(orderNo);
    
        //根据订单号生成退款订单
        RefundInfo refundInfo = new RefundInfo();
        refundInfo.setOrderNo(orderNo);//订单编号
        refundInfo.setRefundNo(OrderNoUtils.getRefundNo());//退款单编号
        refundInfo.setTotalFee(orderInfo.getTotalFee());//原订单金额(分)
        refundInfo.setRefund(orderInfo.getTotalFee());//退款金额(分)
        refundInfo.setReason(reason);//退款原因
    
        //保存退款订单
        baseMapper.insert(refundInfo);
    
        return refundInfo;
    }

#### 1.3.2 更新订单状态与更新退款单 ####

//更新订单状态
    orderInfoService.updateStatusByOrderNo(orderNo, OrderStatus.REFUND_PROCESSING);
    
    //更新退款单
    refundsInfoService.updateRefund(bodyAsString);

/**
     * 记录退款记录
     * @param content
     */
    @Override
    public void updateRefund(String content) {
        
    
        //将json字符串转换成Map
        HashMap resultMap = JSONObject.parseObject(content, HashMap.class);
    
        //根据退款单编号修改退款单
        QueryWrapper<RefundInfo> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("refund_no", resultMap.get("out_refund_no"));
    
        //设置要修改的字段
        RefundInfo refundInfo = new RefundInfo();
    
        refundInfo.setRefundId( resultMap.get("refund_id").toString());//微信支付退款单号
    
        //查询退款和申请退款中的返回参数
        if(resultMap.get("status") != null){
        
            refundInfo.setRefundStatus( resultMap.get("status").toString());//退款状态
            refundInfo.setContentReturn(content);//将全部响应结果存入数据库的content字段
        }
        //退款回调中的回调参数
        if(resultMap.get("refund_status") != null){
        
            refundInfo.setRefundStatus(resultMap.get("refund_status").toString());//退款状态
            refundInfo.setContentNotify(content);//将全部响应结果存入数据库的content字段
        }
    
        //更新退款单
        baseMapper.update(refundInfo, queryWrapper);
    }

/**
     * 根据订单号更新订单状态
     */
    @Override
    public void updateStatusByOrderNo(String outTradeNo, OrderStatus orderStatus) {
        
        log.info("更新订单状态 ===> {}", orderStatus.getType());
    
        QueryWrapper<OrderInfo> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("order_no", outTradeNo);
    
        OrderInfo orderInfo = new OrderInfo();
        orderInfo.setOrderStatus(orderStatus.getType());
    
        baseMapper.update(orderInfo, queryWrapper);
    }

#### 1.3.3 调用退款API ####

我们这个地方退款就是退全款，如果想退部分金额也可以，多次退款也可以

/**
         * 用户退款
         * @param orderNo 商户订单号
         * @param reason  退款原因
         */
        @Transactional(rollbackFor = Exception.class)
        @Override
        public void refund(String orderNo, String reason) throws Exception {
        
    
            log.info("创建退款单记录");
            //根据订单编号创建退款单
            RefundInfo refundsInfo = refundsInfoService.createRefundByOrderNo(orderNo, reason);
    
            log.info("调用退款API");
    
            //调用统一下单API
            String url = wxPayConfig.getDomain().concat(WxApiType.DOMESTIC_REFUNDS.getType());
            HttpPost httpPost = new HttpPost(url);
    
            // 请求body参数
            Map paramsMap = new HashMap();
            paramsMap.put("out_trade_no", orderNo);//订单编号
            paramsMap.put("out_refund_no", refundsInfo.getRefundNo());//退款单编号
            paramsMap.put("reason",reason);//退款原因
            paramsMap.put("notify_url", wxPayConfig.getNotifyDomain().concat(WxNotifyType.REFUND_NOTIFY.getType()));//退款通知地址
    
            Map amountMap = new HashMap();
            amountMap.put("refund", refundsInfo.getRefund());//退款金额
            amountMap.put("total", refundsInfo.getTotalFee());//原订单金额
            amountMap.put("currency", "CNY");//退款币种
            paramsMap.put("amount", amountMap);
    
            //将参数转换成json字符串
    //        String jsonParams = gson.toJson(paramsMap);
            String jsonParams = JSONObject.toJSONString(paramsMap);
            log.info("请求参数 ===> {}" + jsonParams);
    
            StringEntity entity = new StringEntity(jsonParams,"utf-8");
            entity.setContentType("application/json");//设置请求报文格式
            httpPost.setEntity(entity);//将请求报文放入请求对象
            httpPost.setHeader("Accept", "application/json");//设置响应报文格式
    
            //完成签名并执行请求，并完成验签
            CloseableHttpResponse response = httpClient.execute(httpPost);
    
            try {
        
    
                //解析响应结果
                String bodyAsString = EntityUtils.toString(response.getEntity());
                int statusCode = response.getStatusLine().getStatusCode();
                if (statusCode == 200) {
        
                    log.info("成功, 退款返回结果 = " + bodyAsString);
                } else if (statusCode == 204) {
        
                    log.info("成功");
                } else {
        
                    throw new RuntimeException("退款异常, 响应码 = " + statusCode+ ", 退款返回结果 = " + bodyAsString);
                }
    
                //更新订单状态
                orderInfoService.updateStatusByOrderNo(orderNo, OrderStatus.REFUND_PROCESSING);
    
                //更新退款单
                refundsInfoService.updateRefund(bodyAsString);
    
            } finally {
        
                response.close();
            }
        }

#### 1.3.4 效果图 ####

![image-20231107142535438][]

## 二、查询退款API ##

> 查询退款API和查询订单API几乎是一个样子的

我们规定，当商户平台的某个退款订单在五分钟之内没有收到退款通知，我们商户平台就会主动调用查询退款API，查查是怎么个事

![image-20231107142950482][]

注意商户退款单号是一个路径参数

![image-20231107143017622][]

/**
     * 查询退款接口调用
     * @param refundNo
     * @return
     */
    @Override
    public String queryRefund(String refundNo) throws Exception {
        
    
        log.info("查询退款接口调用 ===> {}", refundNo);
    
        String url =  String.format(WxApiType.DOMESTIC_REFUNDS_QUERY.getType(), refundNo);
        url = wxPayConfig.getDomain().concat(url);
    
        //创建远程Get 请求对象
        HttpGet httpGet = new HttpGet(url);
        httpGet.setHeader("Accept", "application/json");
    
        //完成签名并执行请求
        CloseableHttpResponse response = httpClient.execute(httpGet);
    
        try {
        
            String bodyAsString = EntityUtils.toString(response.getEntity());
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
        
                log.info("成功, 查询退款返回结果 = " + bodyAsString);
            } else if (statusCode == 204) {
        
                log.info("成功");
            } else {
        
                throw new RuntimeException("查询退款异常, 响应码 = " + statusCode+ ", 查询退款返回结果 = " + bodyAsString);
            }
    
            return bodyAsString;
    
        } finally {
        
            response.close();
        }
    }

**自己写个接口测试一下**

/**
     * 查询退款
     * @param refundNo
     * @return
     * @throws Exception
     */
    @ApiOperation("查询退款：测试用")
    @GetMapping("/query-refund/{refundNo}")
    public R queryRefund(@PathVariable String refundNo) throws Exception {
        
    
        log.info("查询退款");
    
        String result = wxPayService.queryRefund(refundNo);
        return R.ok().setMessage("查询成功").data("result", result);
    }

![image-20231107145609857][]

## 三、退款结果通知 ##

与之前写的很类似，只不过一个是支付通知，一个是退款通知[1.4 内网穿透与通知、查询用户订单-CSDN博客][1.4 _-CSDN]

### 3.1 Controller ###

/**
     * 退款结果通知
     * 退款状态改变后，微信会把相关退款结果发送给商户。
     */
    @ApiOperation("退款结果通知")
    @PostMapping("/refunds/notify")
    public String refundsNotify(HttpServletRequest request, HttpServletResponse response){
        
    
        log.info("退款通知执行");
        Map<String, String> map = new HashMap<>();//应答对象
    
        try {
        
            //处理通知参数
            String body = HttpUtils.readData(request);
    
            HashMap<String, Object> bodyMap = JSONObject.parseObject(body, HashMap.class);
    
            String requestId = (String)bodyMap.get("id");
            log.info("支付通知的id ===> {}", requestId);
    
            //签名的验证
            WechatPay2ValidatorForRequest wechatPay2ValidatorForRequest
                    = new WechatPay2ValidatorForRequest(verifier, requestId, body);
            if(!wechatPay2ValidatorForRequest.validate(request)){
        
    
                log.error("通知验签失败");
                //失败应答
                response.setStatus(500);
                map.put("code", "ERROR");
                map.put("message", "通知验签失败");
                return JSONObject.toJSONString(map);
            }
            log.info("通知验签成功");
    
            //处理退款单
            wxPayService.processRefund(bodyMap);
    
            //成功应答
            response.setStatus(200);
            map.put("code", "SUCCESS");
            map.put("message", "成功");
            return JSONObject.toJSONString(map);
    
        } catch (Exception e) {
        
            e.printStackTrace();
            //失败应答
            response.setStatus(500);
            map.put("code", "ERROR");
            map.put("message", "失败");
            return JSONObject.toJSONString(map);
        }
    }

### 3.2 Service处理退款单 ###

/**
     * 处理退款单
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public void processRefund(Map<String, Object> bodyMap) throws Exception {
        
    
        log.info("退款单");
        JSONObject jsonObject = JSONObject.parseObject(JSONObject.toJSONString(bodyMap));
        //解密报文
        String plainText = decryptFromResource(jsonObject);
    
        //将明文转换成map
        HashMap plainTextMap = JSONObject.parseObject(plainText,HashMap.class);
        String orderNo = (String)plainTextMap.get("out_trade_no");
    
        if(lock.tryLock()){
        
            try {
        
    
                String orderStatus = orderInfoService.getOrderStatus(orderNo);
                if (!OrderStatus.REFUND_PROCESSING.getType().equals(orderStatus)) {
        
                    return;
                }
    
                //更新订单状态
                orderInfoService.updateStatusByOrderNo(orderNo, OrderStatus.REFUND_SUCCESS);
    
                //更新退款单
                refundsInfoService.updateRefund(plainText);
    
            } finally {
        
                //要主动释放锁
                lock.unlock();
            }
        }
    }

## 四、账单 ##

账单的作用就是方便商户进行对账

https://pay.weixin.qq.com/docs/merchant/apis/native-payment/download-bill.html![image-20231107151923117][]

> 现申请账单的url，虽然后将url当做下载交易/资金账单的参数向微信支付平台发起请求下载账单

### 4.1 申请账单API ###

**下图所示是交易账单，交易账单更多的是针对微信用户**

![image-20231107152122643][]

**下图所示是资金账单，更多的是侧重资金流水**

![image-20231107152230894][]

**我们为了方便，下载交易账单和资金账单都写在一块，请求的时候添加一个type区分是申请交易账单还是下载资金账单**

@ApiOperation("获取账单url：测试用")
    @GetMapping("/querybill/{billDate}/{type}")
    public R queryTradeBill(
            @PathVariable String billDate,
            @PathVariable String type) throws Exception {
        
    
        log.info("获取账单url");
    
        String downloadUrl = wxPayService.queryBill(billDate, type);
        return R.ok().setMessage("获取账单url成功").data("downloadUrl", downloadUrl);
    }

**Service层处理**

/**
     * 申请账单
     * @param billDate
     * @param type
     * @return
     * @throws Exception
     */
    @Override
    public String queryBill(String billDate, String type) throws Exception {
        
        log.warn("申请账单接口调用 {}", billDate);
    
        String url = "";
        if("tradebill".equals(type)){
        
            url =  WxApiType.TRADE_BILLS.getType();
        }else if("fundflowbill".equals(type)){
        
            url =  WxApiType.FUND_FLOW_BILLS.getType();
        }else{
        
            throw new RuntimeException("不支持的账单类型");
        }
    
        url = wxPayConfig.getDomain().concat(url).concat("?bill_date=").concat(billDate);
    
        //创建远程Get 请求对象
        HttpGet httpGet = new HttpGet(url);
        httpGet.addHeader("Accept", "application/json");
    
        //使用wxPayClient发送请求得到响应
        CloseableHttpResponse response = httpClient.execute(httpGet);
    
        try {
        
    
            String bodyAsString = EntityUtils.toString(response.getEntity());
    
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
        
                log.info("成功, 申请账单返回结果 = " + bodyAsString);
            } else if (statusCode == 204) {
        
                log.info("成功");
            } else {
        
                throw new RuntimeException("申请账单异常, 响应码 = " + statusCode+ ", 申请账单返回结果 = " + bodyAsString);
            }
    
            //获取账单下载地址
            Map<String, String> resultMap = JSONObject.parseObject(bodyAsString, HashMap.class);
            return resultMap.get("download_url");
    
        } finally {
        
            response.close();
        }
    }

![image-20231107153550393][]

我们复制上面的"downloadUrl": "https://api.mch.weixin.qq.com/v3/billdownload/file?token=U62KXq-sD-MreORg6ZzSRIjztZAdN-LNcSlwOKIkhnizBe2jMYDnhWkB7xXfC\_Gk"url是没有办法下载的，只能通过下载账单API进行下载

### 4.2 下载账单API ###

**首先记得在配置类中增加一个wxPayNoSignClient，这个对象不需要验签，因为我们下载账单API需要跳过验签的流程**

![image-20231107170744599][]

/**
     * 获取HttpClient，无需进行应答签名验证，跳过验签的流程
     */
    @Bean(name = "wxPayNoSignClient")
    public CloseableHttpClient getWxPayNoSignClient(){
        
    
        //获取商户私钥
        PrivateKey privateKey = getPrivateKey(privateKeyPath);
    
        //用于构造HttpClient
        WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create()
                //设置商户信息
                .withMerchant(mchId, mchSerialNo, privateKey)
                //无需进行签名验证、通过withValidator((response) -> true)实现
                .withValidator((response) -> true);
    
        // 通过WechatPayHttpClientBuilder构造的HttpClient，会自动的处理签名和验签，并进行证书自动更新
        CloseableHttpClient httpClient = builder.build();
    
        log.info("== getWxPayNoSignClient END ==");
    
        return httpClient;
    }

**下载账单的接口**

@GetMapping("/downloadbill/{billDate}/{type}")
    public R downloadBill(
            @PathVariable String billDate,
            @PathVariable String type) throws Exception {
        
    
        log.info("下载账单");
        String result = wxPayService.downloadBill(billDate, type);
    
        return R.ok().data("result", result);
    }

**下载账单的具体实现，一定要记得跳过验签**

@Resource
        private CloseableHttpClient wxPayNoSignClient; //无需应答签名，这个地方要用这个对象
    
        /**
         * 下载账单
         * @param billDate
         * @param type
         * @return
         * @throws Exception
         */
        @Override
        public String downloadBill(String billDate, String type) throws Exception {
        
            log.warn("下载账单接口调用 {}, {}", billDate, type);
    
            //获取账单url地址
            String downloadUrl = this.queryBill(billDate, type);
            //创建远程Get 请求对象
            HttpGet httpGet = new HttpGet(downloadUrl);
            httpGet.addHeader("Accept", "application/json");
    
            //使用wxPayClient发送请求得到响应
            CloseableHttpResponse response = wxPayNoSignClient.execute(httpGet);
    
            try {
        
    
                String bodyAsString = EntityUtils.toString(response.getEntity());
    
                int statusCode = response.getStatusLine().getStatusCode();
                if (statusCode == 200) {
        
                    log.info("成功, 下载账单返回结果 = " + bodyAsString);
                } else if (statusCode == 204) {
        
                    log.info("成功");
                } else {
        
                    throw new RuntimeException("下载账单异常, 响应码 = " + statusCode+ ", 下载账单返回结果 = " + bodyAsString);
                }
    
                return bodyAsString;
    
            } finally {
        
                response.close();
            }
        }

**在Swagger中进行测试**

这个地方是前端将数据转换成文件的，在后端将数据转成文件然后传输给前端也可以

![image-20231107171412741][]

![image-20231107172829536][]

[1.3 _Native_ -_-CSDN]: https://blog.csdn.net/weixin_51351637/article/details/134263301?spm=1001.2014.3001.5502
[1.4 _-CSDN]: https://blog.csdn.net/weixin_51351637/article/details/134264991?spm=1001.2014.3001.5502
[Link 1]: https://pay.weixin.qq.com/docs/merchant/apis/native-payment/create.html
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[image-20231107134421565]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/e9b39b838c89474a8586187052b31d57.png
[image-20231107134319712]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/8d1049864779456b976e184ecaef5733.png
[image-20231107142535438]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/f008d192cf8147eb89dae871f10c45ce.png
[image-20231107142950482]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/1ea06ed8231c4c7bb58209d71819c88a.png
[image-20231107143017622]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/b8042de48861423bbc3e1b6adc7e41b3.png
[image-20231107145609857]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/63f533fad98a468aa3c3431f682bd3ee.png
[image-20231107151923117]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/2b764ddbaed944d2a22262c655c141c4.png
[image-20231107152122643]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/6700687fe2d84eda8122ff5298683d41.png
[image-20231107152230894]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/817ed98adff54fa7bae82f337f396320.png
[image-20231107153550393]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/19/a0cb91a197b948f0b6a2486c14d2018b.png
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