商品分类的添加、修改、删除功能完成，现在能够正确获取分类名称

src/main/java/icu/sunway/ai_spring_example/Common/Constant/MessageConstant.java

@@ -18,4 +18,5 @@ public class MessageConstant {
     public static final String ORDER_STATUS_ERROR = "订单状态错误";
     public static final String ORDER_NOT_FOUND = "订单不存在";
     public static final String PRODUCT_NOT_FOUND = "商品不存在";
+    public static final String PRODUCT_HAS_CHILDREN = "商品有子商品，不能删除";
 }

src/main/java/icu/sunway/ai_spring_example/Controllers/ProductController.java

@@ -2,8 +2,11 @@ package icu.sunway.ai_spring_example.Controllers;
 
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import icu.sunway.ai_spring_example.Common.Response.ResponseEntity;
+import icu.sunway.ai_spring_example.Service.ProductCategoryService;
 import icu.sunway.ai_spring_example.Service.ProductService;
+import icu.sunway.ai_spring_example.pojo.Dto.ProductCategoryDTO;
 import icu.sunway.ai_spring_example.pojo.Dto.ProductDTO;
+import icu.sunway.ai_spring_example.pojo.Entity.ProductCategory;
 import icu.sunway.ai_spring_example.pojo.Vo.ProductListVO;
 import icu.sunway.ai_spring_example.pojo.Vo.ProductVO;
 import lombok.extern.slf4j.Slf4j;
@@ -11,6 +14,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 @RestController
@@ -21,6 +25,9 @@ public class ProductController {
     @Autowired
     private ProductService productService;
 
+
+    @Autowired
+    private ProductCategoryService categoryService;
     /**
      * 新增商品
      */
@@ -83,4 +90,42 @@ public class ProductController {
         ProductVO productVO = productService.getProductDetail(id);
         return ResponseEntity.success(productVO);
     }
+    /**
+     * 添加商品分类
+     */
+    @PostMapping("/category")
+    public ResponseEntity addCategory(@RequestBody ProductCategoryDTO categoryDTO) {
+        log.info("新增商品分类: {}", categoryDTO);
+        categoryService.addCategory(categoryDTO);
+        return ResponseEntity.success("分类新增成功");
+    }
+
+    /**
+     * 修改商品分类
+     */
+    @PutMapping("/category")
+    public ResponseEntity updateCategory(@RequestBody ProductCategoryDTO categoryDTO) {
+        log.info("修改商品分类: {}", categoryDTO);
+        categoryService.updateCategory(categoryDTO);
+        return ResponseEntity.success("分类修改成功");
+    }
+
+    /**
+     * 删除商品分类
+     */
+    @DeleteMapping("/category/{id}")
+    public ResponseEntity deleteCategory(@PathVariable Long id) {
+        log.info("删除商品分类: id={}", id);
+        categoryService.deleteCategory(id);
+        return ResponseEntity.success("分类删除成功");
+    }
+
+    /**
+     * 查询所有商品分类（树形结构）
+     */
+    @GetMapping("/category")
+    public ResponseEntity<List<ProductCategory>> getAllCategories() {
+        List<ProductCategory> categories = categoryService.getAllCategories();
+        return ResponseEntity.success(categories);
+    }
 }

src/main/java/icu/sunway/ai_spring_example/Mapper/ProductCategoryMapper.java

@@ -4,14 +4,7 @@ import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import icu.sunway.ai_spring_example.pojo.Entity.ProductCategory;
 import org.apache.ibatis.annotations.Mapper;
 
-import java.util.List;
 
 @Mapper
 public interface ProductCategoryMapper extends BaseMapper<ProductCategory> {
-
-    /**
-     * 查询所有分类（树形结构）
-     * @return 分类列表
-     */
-    List<ProductCategory> selectAllCategories();
 }

src/main/java/icu/sunway/ai_spring_example/Service/Impl/ProductCategoryServiceImpl.java

@@ -0,0 +1,80 @@
+package icu.sunway.ai_spring_example.Service.Impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import icu.sunway.ai_spring_example.Common.Constant.MessageConstant;
+import icu.sunway.ai_spring_example.Mapper.ProductCategoryMapper;
+import icu.sunway.ai_spring_example.Service.ProductCategoryService;
+import icu.sunway.ai_spring_example.pojo.Dto.ProductCategoryDTO;
+import icu.sunway.ai_spring_example.pojo.Entity.ProductCategory;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.BeanUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import java.time.LocalDateTime;
+import java.util.List;
+
+@Service
+@Slf4j
+public class ProductCategoryServiceImpl extends ServiceImpl<ProductCategoryMapper, ProductCategory> implements ProductCategoryService {
+
+    @Autowired
+    private ProductCategoryMapper categoryMapper;
+
+    @Override
+    @Transactional
+    public void addCategory(ProductCategoryDTO categoryDTO) {
+        ProductCategory category = new ProductCategory();
+        BeanUtils.copyProperties(categoryDTO, category);
+        // 设置默认值（如果DTO中未传递）
+        if (category.getParentId() == null) {
+            category.setParentId(0L); // 默认为一级分类
+        }
+        if (category.getSort() == null) {
+            category.setSort(0);
+        }
+        if (category.getIsDeleted() == null) {
+            category.setIsDeleted(0);
+        }
+        categoryMapper.insert(category);
+        log.info("新增商品分类: {}", category);
+    }
+
+    @Override
+    @Transactional
+    public void updateCategory(ProductCategoryDTO categoryDTO) {
+        // 验证分类是否存在
+        ProductCategory existingCategory = categoryMapper.selectById(categoryDTO.getId());
+        if (existingCategory == null) {
+            throw new RuntimeException("商品分类不存在");
+        }
+        // 复制更新字段
+        BeanUtils.copyProperties(categoryDTO, existingCategory);
+        existingCategory.setUpdateTime(LocalDateTime.now()); // 更新时间
+        categoryMapper.updateById(existingCategory);
+        log.info("修改商品分类: {}", existingCategory);
+    }
+
+    @Override
+    @Transactional
+    public void deleteCategory(Long id) {
+        // 检查是否有子分类
+        LambdaQueryWrapper<ProductCategory> queryWrapper = new LambdaQueryWrapper<>();
+        queryWrapper.eq(ProductCategory::getParentId, id);
+        List<ProductCategory> children = categoryMapper.selectList(queryWrapper);
+        if (!children.isEmpty()) {
+            throw new RuntimeException(MessageConstant.PRODUCT_HAS_CHILDREN);
+        }
+        // 逻辑删除，字段isDeleted设置为1
+        categoryMapper.deleteById(id);
+        log.info("删除商品分类: id={}", id);
+    }
+
+    @Override
+    public List<ProductCategory> getAllCategories() {
+        QueryWrapper<ProductCategory> queryWrapper = new QueryWrapper<>();
+        return categoryMapper.selectList(queryWrapper);
+    }
+}

src/main/java/icu/sunway/ai_spring_example/Service/Impl/ProductServiceImpl.java

@@ -7,12 +7,14 @@ import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import icu.sunway.ai_spring_example.Common.Exception.BusinessException;
 import icu.sunway.ai_spring_example.Common.Constant.MessageConstant;
+import icu.sunway.ai_spring_example.Mapper.ProductCategoryMapper;
 import icu.sunway.ai_spring_example.Mapper.ProductMapper;
 import icu.sunway.ai_spring_example.Mapper.ProductSkuMapper;
 import icu.sunway.ai_spring_example.Service.ProductService;
 import icu.sunway.ai_spring_example.pojo.Dto.ProductDTO;
 import icu.sunway.ai_spring_example.pojo.Dto.ProductSkuDTO;
 import icu.sunway.ai_spring_example.pojo.Entity.Product;
+import icu.sunway.ai_spring_example.pojo.Entity.ProductCategory;
 import icu.sunway.ai_spring_example.pojo.Entity.ProductSku;
 import icu.sunway.ai_spring_example.pojo.Vo.ProductListVO;
 import icu.sunway.ai_spring_example.pojo.Vo.ProductVO;
@@ -35,6 +37,9 @@ public class ProductServiceImpl extends ServiceImpl<ProductMapper, Product> impl
     @Autowired
     private ProductSkuMapper productSkuMapper;
 
+    @Autowired
+    private ProductCategoryMapper productCategoryMapper;
+
     @Override
     @Transactional
     public void saveProduct(ProductDTO productDTO) {
@@ -116,9 +121,14 @@ public class ProductServiceImpl extends ServiceImpl<ProductMapper, Product> impl
                 .createTime(product.getCreateTime())
                 .updateTime(product.getUpdateTime())
                 .build();
+
         if (productVO == null) {
             throw new BusinessException(MessageConstant.PRODUCT_NOT_FOUND);
         }
+        QueryWrapper<ProductCategory> queryWrapperCategory = new QueryWrapper<>();
+        queryWrapperCategory.eq("id", product.getCategoryId());
+        ProductCategory productCategory = productCategoryMapper.selectOne(queryWrapperCategory);
+        productVO.setCategoryName(productCategory.getName());
         // 查询规格列表
         productVO.setSkuList(productSkuMapper.selectByProductId(id));
         return productVO;

src/main/java/icu/sunway/ai_spring_example/Service/ProductCategoryService.java

@@ -0,0 +1,33 @@
+package icu.sunway.ai_spring_example.Service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import icu.sunway.ai_spring_example.pojo.Dto.ProductCategoryDTO;
+import icu.sunway.ai_spring_example.pojo.Entity.ProductCategory;
+import java.util.List;
+
+public interface ProductCategoryService extends IService<ProductCategory> {
+
+    /**
+     * 添加商品分类
+     * @param categoryDTO 分类信息
+     */
+    void addCategory(ProductCategoryDTO categoryDTO);
+
+    /**
+     * 修改商品分类
+     * @param categoryDTO 分类信息
+     */
+    void updateCategory(ProductCategoryDTO categoryDTO);
+
+    /**
+     * 删除商品分类
+     * @param id 分类ID
+     */
+    void deleteCategory(Long id);
+
+    /**
+     * 查询所有分类（树形结构）
+     * @return 分类列表
+     */
+    List<ProductCategory> getAllCategories();
+}

src/main/java/icu/sunway/ai_spring_example/pojo/Dto/ProductCategoryDTO.java

@@ -0,0 +1,14 @@
+package icu.sunway.ai_spring_example.pojo.Dto;
+
+import lombok.Data;
+
+@Data
+public class ProductCategoryDTO {
+    private Long id;
+    private Long parentId;
+    private String name;
+    private Integer status;
+    private Integer sort;
+    private String icon;
+    private Integer level;
+}