购物车相关代码

src/main/java/com/aida/seller/module/listing/controller/ListingMallController.java

@@ -13,6 +13,8 @@ import io.swagger.v3.oas.annotations.tags.Tag;
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.List;
+
 /**
  * 商城首页商品 Controller（Feign 端）
  */
@@ -39,4 +41,12 @@ public class ListingMallController {
         ListingDetailVO detail = listingMallService.getListingDetail(id);
         return Response.success(detail);
     }
+
+    @Operation(summary = "批量获取商品简要信息（购物车用）", description = "返回指定商品ID列表的基本信息")
+    @PostMapping("/mall/batch")
+    public Response<List<ListingMallVO>> getListingSummaries(
+            @RequestBody List<Long> listingIds) {
+        List<ListingMallVO> result = listingMallService.getListingSummaries(listingIds);
+        return Response.success(result);
+    }
 }

src/main/java/com/aida/seller/module/listing/service/ListingMallService.java

@@ -5,6 +5,8 @@ import com.aida.seller.module.listing.vo.ListingDetailVO;
 import com.aida.seller.module.listing.vo.ListingMallVO;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 
+import java.util.List;
+
 /**
  * 商城首页商品 Service 接口
  */
@@ -25,4 +27,12 @@ public interface ListingMallService {
      * @return 商品详情
      */
     ListingDetailVO getListingDetail(Long id);
+
+    /**
+     * 批量获取商品简要信息（购物车用）
+     *
+     * @param listingIds 商品ID列表
+     * @return 商品简要信息列表
+     */
+    List<ListingMallVO> getListingSummaries(List<Long> listingIds);
 }

src/main/java/com/aida/seller/module/listing/service/impl/ListingMallServiceImpl.java

@@ -26,6 +26,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
+import com.aida.seller.module.listing.vo.ListingMallVO;
+
 /**
  * 商城首页商品 Service 实现
  */
@@ -164,4 +166,31 @@ public class ListingMallServiceImpl extends ServiceImpl<ListingMallMapper, Listi
         vo.setImages(imageMap);
         return vo;
     }
+
+    @Override
+    public List<ListingMallVO> getListingSummaries(List<Long> listingIds) {
+        if (listingIds == null || listingIds.isEmpty()) {
+            return List.of();
+        }
+        List<ListingEntity> entities = this.list(
+                new LambdaQueryWrapper<ListingEntity>()
+                        .in(ListingEntity::getId, listingIds)
+                        .eq(ListingEntity::getDeleted, 0));
+        Map<Long, ListingEntity> entityMap = entities.stream()
+                .collect(Collectors.toMap(ListingEntity::getId, e -> e));
+        List<ListingMallVO> listingMallVOS = listingIds.stream()
+                .filter(entityMap::containsKey)
+                .map(id -> {
+                    ListingEntity entity = entityMap.get(id);
+                    ListingMallVO vo = new ListingMallVO();
+                    vo.setId(entity.getId());
+                    vo.setCover(minioUtil.processMinioResource(entity.getCover(), CommonConstants.MINIO_PATH_TIMEOUT));
+                    vo.setTitle(entity.getTitle());
+                    vo.setPrice(entity.getPrice());
+                    vo.setStatus(entity.getStatus());
+                    return vo;
+                })
+                .toList();
+        return listingMallVOS;
+    }
 }

src/main/java/com/aida/seller/module/listing/vo/ListingMallVO.java

@@ -22,4 +22,6 @@ public class ListingMallVO implements Serializable {
     private String title;
 
     private BigDecimal price;
+
+    private Integer status;
 }

src/main/java/com/aida/seller/module/order/service/OrderService.java

@@ -66,4 +66,13 @@ public interface OrderService {
      * @return 已购商品分页列表，按购买时间降序排列
      */
     IPage<AssetsItemVO> getAssetsPage(AssetsDTO dto);
+
+    /**
+     * 批量查询指定商品是否已被买家购买
+     *
+     * @param listingIds 商品ID列表
+     * @param buyerId    买家ID
+     * @return 已购买的商品ID列表
+     */
+    List<Long> getPurchasedListingIds(List<Long> listingIds, Long buyerId);
 }

src/main/java/com/aida/seller/module/order/service/OrderServiceImpl.java

@@ -209,12 +209,22 @@ public class OrderServiceImpl extends ServiceImpl<OrderInfoMapper, OrderInfoEnti
             throw new BusinessException("买家账号不能为空");
         }
 
+        List<Long> purchasedListingIds = getPurchasedListingIds(dto.getListingIds(), dto.getBuyerId());
+        List<Long> unpurchasedListingIds = dto.getListingIds().stream()
+                .filter(id -> !purchasedListingIds.contains(id))
+                .collect(Collectors.toList());
+        if (CollectionUtils.isEmpty(unpurchasedListingIds)) {
+            throw new BusinessException("所有商品均已购买，无需重复下单");
+        }
+        dto.setListingIds(unpurchasedListingIds);
+
         List<ListingEntity> listings = listingMapper.selectBatchIds(dto.getListingIds());
         if (CollectionUtils.isEmpty(listings)) {
             throw new BusinessException("未找到对应的商品");
         }
 
         Map<Long, List<ListingEntity>> listingsBySeller = listings.stream()
+                .filter(l -> l.getStatus() == 1)
                 .collect(Collectors.groupingBy(ListingEntity::getSellerId));
 
         List<Long> orderIds = new ArrayList<>();
@@ -279,6 +289,7 @@ public class OrderServiceImpl extends ServiceImpl<OrderInfoMapper, OrderInfoEnti
         BigDecimal grandTotal = totalPrices.stream()
                 .reduce(BigDecimal.ZERO, BigDecimal::add);
         result.setTotalAmount(grandTotal);
+        result.setUnpurchasedListingIds(dto.getListingIds());
         return result;
     }
 
@@ -321,4 +332,18 @@ public class OrderServiceImpl extends ServiceImpl<OrderInfoMapper, OrderInfoEnti
         resultPage.setRecords(records);
         return resultPage;
     }
+
+    @Override
+    public List<Long> getPurchasedListingIds(List<Long> listingIds, Long buyerId) {
+        if (CollectionUtils.isEmpty(listingIds) || buyerId == null) {
+            return Collections.emptyList();
+        }
+        LambdaQueryWrapper<OrderItemEntity> wrapper = new LambdaQueryWrapper<>();
+        wrapper.eq(OrderItemEntity::getBuyerId, buyerId)
+               .in(OrderItemEntity::getListingId, listingIds);
+        return orderItemMapper.selectList(wrapper).stream()
+                .map(OrderItemEntity::getListingId)
+                .distinct()
+                .collect(Collectors.toList());
+    }
 }

src/main/java/com/aida/seller/module/order/vo/CreateOrderResultVO.java

@@ -18,4 +18,7 @@ public class CreateOrderResultVO implements Serializable {
 
     @Schema(description = "所有订单总金额（HK$）")
     private BigDecimal totalAmount;
+
+    @Schema(description = "本次成功下单的未购买商品ID列表")
+    private List<Long> unpurchasedListingIds;
 }

src/main/resources/db/schema.sql

@@ -5,7 +5,6 @@ CREATE TABLE seller_listing (
     title           VARCHAR(255) NOT NULL COMMENT '商品标题',
     description     TEXT COMMENT '商品描述',
     price           DECIMAL(10,2) COMMENT '价格',
-    stock           INT COMMENT '库存数量',
     cover           VARCHAR(200) COMMENT '封面图URL',
     view_count      INT DEFAULT 0 COMMENT '浏览量',
     status          INT(1) DEFAULT 0 COMMENT '状态: 0-草稿, 1-已发布, 2-已删除',