Java微信支付接入（10）API V3 申请退款API

官方文档：

https://pay.weixin.qq.com/wiki/doc/apiv3/apis/chapter3_4_9.shtml

1.创建退款单

接口：

    @ApiOperation("退款企业订单")@PostMapping("/refunds")public ResultMessageBean refunds(String orderId){return businessOrderService.refund(orderId);}

业务实现：

@Overridepublic ResultMessageBean refund(String orderId) {try {//生成退款订单if(!this.createRefundByOrderId(orderId)){return new ResultMessageBean(ResultErrorEnum.custom_error.getCode(), "生成退款订单失败,orderId ===> " + orderId);}//调用微信退款APIif(!wxRefund(orderId)){return new ResultMessageBean(ResultErrorEnum.custom_error.getCode(), "调用微信退款API失败,orderId ===> " + orderId);}}catch (Exception e){logger.info("订单退款失败,orderId ===> " + orderId);return new ResultMessageBean(ResultErrorEnum.custom_error.getCode(), "订单退款失败,orderId ===> " + orderId);}return new ResultMessageBean(ResultErrorEnum.request_success.getCode(), ResultErrorEnum.request_success.getMessage());}

创建退款订单方法

 private boolean createRefundByOrderId(String orderId) {TBusinessOrder tBusinessOrder=bussinessOrderMapper.findByOrderIdAndState(orderId,2);if(null==tBusinessOrder){return false;}TBusinessOrder refundBusinessOrder=new TBusinessOrder();refundBusinessOrder.setOrderId(orderId);refundBusinessOrder.setRefundId(UUIDTool.getUUID());refundBusinessOrder.setRefundPrice(tBusinessOrder.getPrice());refundBusinessOrder.setRefundTime(new Date());int flag=bussinessOrderMapper.updateBusinessOrder(refundBusinessOrder);if(flag!=0){return true;}return false;}

调用微信退款API 方法

/*** 调用微信退款接口* */private boolean wxRefund(String orderId) {try {logger.info("调用退款API orderId===>"+orderId);TBusinessOrder refundsInfo =bussinessOrderMapper.findByOrderIdAndState(orderId, 2);//调用统一下单APIString url = wxPayConfig.getDomain().concat(WxApiTypeEnum.DOMESTIC_REFUNDS.getType());logger.info("微信退款API URL ===> " + url);HttpPost httpPost = new HttpPost(url);// 请求body参数Gson gson = new Gson();Map paramsMap = new HashMap();paramsMap.put("out_trade_no", orderId);//订单编号paramsMap.put("out_refund_no", refundsInfo.getRefundId());//退款单编号paramsMap.put("notify_url", wxPayConfig.getNotifyDomain().concat(WxNotifyTypeEnum.REFUND_NOTIFY.getType()));//退款通知地址Map amountMap = new HashMap();amountMap.put("refund", refundsInfo.getRefundPrice());//退款金额amountMap.put("total", refundsInfo.getPrice());//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);logger.info("微信退款API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//TODO:完成签名并执行请求，并完成验签//CloseableHttpResponse response = wxPayClient.execute(httpPost);//TODO:解析响应结果//String bodyAsString = EntityUtils.toString(response.getEntity());//int statusCode = response.getStatusLine().getStatusCode();//TODO:假设响应结果为200,响应内容为退款下单成功int statusCode=200;String bodyAsString="退款下单成功";if (statusCode == 200) {logger.info("成功, 退款返回结果 = " + bodyAsString);} else if (statusCode == 204) {logger.info("成功");} else {logger.info("退款下单失败"+bodyAsString);return false;}}catch (Exception e){e.printStackTrace();logger.infoError(e);return false;}//更新订单状态TBusinessOrder refundBusinessOrder=new TBusinessOrder();refundBusinessOrder.setOrderId(orderId);refundBusinessOrder.setState(4);bussinessOrderMapper.updateBusinessOrder(refundBusinessOrder);return true;}