From 90bf25f06256b06ebcbedd0b2838db9e2f9df40f Mon Sep 17 00:00:00 2001
From: cloudroam <cloudroam>
Date: 星期三, 18 九月 2024 14:44:44 +0800
Subject: [PATCH] add:商品限购数量
---
src/main/java/com/mzl/flower/service/payment/OrderService.java | 64 ++++++++++++++++++++++++++-----
1 files changed, 53 insertions(+), 11 deletions(-)
diff --git a/src/main/java/com/mzl/flower/service/payment/OrderService.java b/src/main/java/com/mzl/flower/service/payment/OrderService.java
index 986d187..54dd68e 100644
--- a/src/main/java/com/mzl/flower/service/payment/OrderService.java
+++ b/src/main/java/com/mzl/flower/service/payment/OrderService.java
@@ -442,8 +442,9 @@
order.setTransportFee(transportFee);
order.setDeliveryName(deliveryName);
- BigDecimal totalAmount = order.getFlowerAmount().add(p.getPacking()).add(transportFee);//使用优惠券之前的总价
+ BigDecimal totalAmount = order.getFlowerAmount();//使用优惠券之前的总价，使用商品价格
CouponRecordDO coupon = useCouponRecord(order.getId(), totalAmount, dto.getCouponRecordId());
+ log.info("用户优惠券: " + coupon);
if(coupon != null){
order.setMemberCouponId(coupon.getId());
order.setMemberCouponCode(coupon.getCouponCode());
@@ -451,6 +452,13 @@
order.setMemberCouponAmount(coupon.getCouponDiscountValue());
totalAmount = totalAmount.subtract(order.getMemberCouponAmount());//满足条件需要减去优惠券金额
+ }
+ if(totalAmount.doubleValue() < 0){//假如扣除优惠券后金额小于0，则按0计算
+ totalAmount = new BigDecimal(0);
+ }
+ totalAmount = totalAmount.add(p.getPacking()).add(transportFee);
+ if(totalAmount.doubleValue() <= 0){//假如总价小于等于0，则支付0.01元
+ totalAmount = new BigDecimal(0.01);
}
order.setTotalAmount(totalAmount);
@@ -474,7 +482,9 @@
Map<Long, List<ParamItemDTO>> paramMap = new HashMap<>();
final BigDecimal flowerAmount = order.getFlowerAmount();//订单商品总价
final BigDecimal memberCouponAmount = order.getMemberCouponAmount();//使用优惠券面值
- for (FlowerCartListDTO f : flowers) {
+ BigDecimal usedCouponAmount = new BigDecimal(0);
+ for (int i = 0; i < flowers.size(); i++) {
+ FlowerCartListDTO f = flowers.get(i);
OrderItem t = new OrderItem();
t.setId(UUIDGenerator.getUUID());
t.setOrderId(order.getId());
@@ -503,9 +513,19 @@
t.setTotal(f.getTotalMember());//使用会员总价
t.setOriginalPrice(pp.getPrice());//非会员售价
- BigDecimal couponAmount = calculateCoupon(memberCouponAmount, t.getTotal(), flowerAmount, t.getNum());
+ boolean isLastOne = i == (flowers.size() - 1);
+ BigDecimal couponAmount = calculateCoupon(memberCouponAmount, t.getTotal()
+ , flowerAmount, t.getNum(), t.getPrice(), isLastOne, usedCouponAmount);
t.setCouponAmount(couponAmount);//每扎平摊的优惠券面值
- t.setRealPrice(t.getPrice().subtract(couponAmount));//退款时使用的真实成交价
+ t.setRealPrice(t.getPrice().subtract(couponAmount));//退款时使用的真实成交单价
+
+ t.setCouponAmountTotal(couponAmount.multiply(BigDecimal.valueOf(t.getNum())));
+ if(isLastOne){
+ t.setCouponAmountTotal(memberCouponAmount.subtract(usedCouponAmount));
+ } else {
+ usedCouponAmount = usedCouponAmount.add(t.getCouponAmountTotal());
+ }
+ t.setRealTotal(t.getTotal().subtract(t.getCouponAmountTotal()));
t.create(userId);
orderItemMapper.insert(t);
@@ -550,19 +570,34 @@
* @param itemTotalAmount
* @param totalAmount
* @param num
+ * @param price
* @return
*/
private BigDecimal calculateCoupon(BigDecimal couponAmount, BigDecimal itemTotalAmount
- , BigDecimal totalAmount, Integer num){
+ , BigDecimal totalAmount, Integer num, BigDecimal price
+ , boolean isLastOne, BigDecimal usedCouponAmount){
if(couponAmount == null){
return new BigDecimal(0);
}
- BigDecimal radio = itemTotalAmount.divide(totalAmount, 2, RoundingMode.HALF_UP);//计算该商品总价在订单中的占比
+
+ if(couponAmount.doubleValue() >= totalAmount.doubleValue()){
+ return price;
+ }
+ if(isLastOne){//最后的商品使用优惠券剩下的面值
+ BigDecimal subCoupon = couponAmount.subtract(usedCouponAmount);//占有的优惠券面值
+ return subCoupon.divide(BigDecimal.valueOf(num), 2, RoundingMode.HALF_UP);
+ }
+
+ /*BigDecimal radio = itemTotalAmount.divide(totalAmount, 2, RoundingMode.HALF_UP);//计算该商品总价在订单中的占比
BigDecimal subCoupon = couponAmount.multiply(radio);//占有的优惠券面值
- return subCoupon.divide(BigDecimal.valueOf(num), 2, RoundingMode.HALF_UP);
+ return subCoupon.divide(BigDecimal.valueOf(num), 2, RoundingMode.HALF_UP);*/
+
+ //不能分步计算，分步计算会有精度问题
+ return couponAmount.multiply(itemTotalAmount).divide(totalAmount.multiply(BigDecimal.valueOf(num)), 2, RoundingMode.HALF_UP);
}
private CouponRecordDO useCouponRecord(String orderId, BigDecimal amount, String couponRecordId){
+ log.info("使用用户优惠券id: " + couponRecordId + "; 订单id: " + orderId);
if(StringUtils.isNotEmpty(couponRecordId)){
//优惠券使用和验证，如果不符合使用条件需要抛出异常。需调用优惠券使用方法
couponRecordService.useCoupon(couponRecordId, orderId, amount);
@@ -777,10 +812,9 @@
orderIds.add(o.getId());
}
- List<OrderItem> itemList = orderItemMapper.selectList(
- new QueryWrapper<OrderItem>().in("order_id", orderIds));
+ List<OrderItemListDTO> itemList = orderItemMapper.getOrderItems(orderIds);
Map<String, List<OrderItemListDTO>> map = new HashMap<>();
- for (OrderItem oi : itemList) {
+ for (OrderItemListDTO oi : itemList) {
String orderId = oi.getOrderId();
List<OrderItemListDTO> ll = map.computeIfAbsent(orderId, k -> new ArrayList<>());
OrderItemListDTO d = new OrderItemListDTO();
@@ -904,10 +938,18 @@
if(llc == null){
llc = new OrderCheckLocationListDTO();
BeanUtils.copyProperties(c, llc);
- rMap.put(locationId, llc);
+ llc.setTotalAmount(new BigDecimal(0));
+ rMap.put(locationId, llc);
result.add(llc);
}
+
+ BigDecimal t = llc.getTotalAmount();
+ if(t == null){
+ t = new BigDecimal(0);
+ }
+ t = t.add(c.getTotalAmount());
+ llc.setTotalAmount(t);
}
Map<Long, String> stationMap = prepareStationMap();
--
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