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封装返回DTO作工具类,更好体现一个多,多对多
新增方法:根据订单id查询对应的商品(实现一对多和转换一对多DTO基础) 给所有的多对多,一对多套上关联DTO
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‎.idea/copilot.data.migration.agent.xml‎

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‎.idea/copilot.data.migration.ask.xml‎

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‎.idea/copilot.data.migration.ask2agent.xml‎

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‎.idea/copilot.data.migration.edit.xml‎

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‎docs/cors-fetch-demo.html‎

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@@ -22,7 +22,7 @@ <h1>跨域请求示例🌵🌵🌵</h1>
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headers: { 'Content-Type': 'application/json' },
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credentials: 'include',
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body: JSON.stringify({
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userId: 8,//改完之后，后端和网页都要重新启动/刷新
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userId: 10,//改完之后，后端和网页都要重新启动/刷新
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password: '123456'
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})
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});

‎drawbluecup-common/src/main/java/com/drawbluecup/convert/DTOConvertUtils.java‎

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package com.drawbluecup.convert;
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import com.drawbluecup.dto.order.OrderRespDTOWithUserAndProducts;
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import com.drawbluecup.dto.product.ProductRespDTOWithout;
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import com.drawbluecup.dto.user.UserRespDTOWithOrderwithproduct;
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import com.drawbluecup.dto.user.UserRespDTOWithout;
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import com.drawbluecup.entity.Order;
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import com.drawbluecup.entity.Product;
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import com.drawbluecup.entity.User;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* 手动DTO转换工具类（全项目复用）
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* 核心：空值保护 + 逻辑统一 + 批量转换
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*/
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public class DTOConvertUtils {
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// ==================== 1. 单个User → UserRespDTOWithout ====================
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public static UserRespDTOWithout convertUserToDTO(User user) {
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// 空值保护：避免空指针
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if (user == null) {
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return null;
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}
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UserRespDTOWithout userDTO = new UserRespDTOWithout();
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userDTO.setId(user.getId());
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userDTO.setName(user.getName());
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userDTO.setPhone(user.getPhone());
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userDTO.setCreateTime(user.getCreateTime());
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userDTO.setUpdateTime(user.getUpdateTime());
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return userDTO;
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}
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// ==================== 2. 单个Product → ProductRespDTOWithout ====================
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public static ProductRespDTOWithout convertProductToDTO(Product product) {
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if (product == null) {
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return null;
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}
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ProductRespDTOWithout productDTO = new ProductRespDTOWithout();
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productDTO.setId(product.getId());
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productDTO.setName(product.getName());
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// 如需添加商品其他字段（如价格），只改这里一次即可
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// productDTO.setPrice(product.getPrice());
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return productDTO;
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}
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// ==================== 3. Product列表 → ProductRespDTOWithout列表 ====================
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public static List<ProductRespDTOWithout> convertProductListToDTOList(List<Product> productList) {
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List<ProductRespDTOWithout> productDTOList = new ArrayList<>();
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// 空值保护：避免遍历null列表
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if (productList == null || productList.isEmpty()) {
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return productDTOList;
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}
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for (Product product : productList) {
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productDTOList.add(convertProductToDTO(product));
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}
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return productDTOList;
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}
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// ==================== 4. 单个Order(一对多) → OrderRespDTOWithUserAndProducts（核心） ====================
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public static OrderRespDTOWithUserAndProducts convertOrderToDTO(Order order, User user) {
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if (order == null) {
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return null;
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}
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OrderRespDTOWithUserAndProducts orderDTO = new OrderRespDTOWithUserAndProducts();
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// 1. 订单基础字段
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orderDTO.setId(order.getId());
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orderDTO.setOrderNo(order.getOrderNo());
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orderDTO.setCreateTime(order.getCreateTime());
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// 2. 用户信息（复用用户转换方法）
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UserRespDTOWithout userDTO = convertUserToDTO(user);
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if (userDTO != null) {
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orderDTO.setUserId(userDTO.getId());
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orderDTO.setUser(userDTO);
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}
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// 3. 商品列表（复用商品列表转换方法）
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orderDTO.setProducts(convertProductListToDTOList(order.getProducts()));
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return orderDTO;
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}
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// ==================== 5. Order列表 → OrderRespDTOWithUserAndProducts列表（批量转换） ====================
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public static List<OrderRespDTOWithUserAndProducts> convertOrderListToDTOList(List<Order> orderList,User user) {
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List<OrderRespDTOWithUserAndProducts> orderDTOList = new ArrayList<>();
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if (orderList == null || orderList.isEmpty()) {
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return orderDTOList;
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}
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// 注意：批量转换时，user需要外部查询后传入，这里先占位，接口中手动处理
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for (Order order : orderList) {
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orderDTOList.add(convertOrderToDTO(order, user));
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}
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return orderDTOList;
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}
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}
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‎drawbluecup-common/src/main/java/com/drawbluecup/dto/order/OrderRespDTO.java‎

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‎drawbluecup-common/src/main/java/com/drawbluecup/dto/order/OrderRespDTOWithUserAndProducts.java‎

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package com.drawbluecup.dto.order;
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import com.drawbluecup.dto.product.ProductRespDTOWithout;
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import com.drawbluecup.dto.user.UserRespDTOWithout;
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import com.drawbluecup.entity.Product;
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import com.drawbluecup.entity.User;
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import io.swagger.v3.oas.annotations.media.Schema;
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import lombok.Data;
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import java.time.LocalDateTime;
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import java.util.List;
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@Data
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@Schema(name = "OrderRespDTOWithUserAndProducts", description = "订单信息出参(一对多）")// Swagger注解：文档里说明这个DTO的作用
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public class OrderRespDTOWithUserAndProducts {
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@Schema(description = "订单主键id")
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private Integer id;
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@Schema(description = "订单编号")
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private String orderNo;
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@Schema(description = "订单创建时间")
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private LocalDateTime createTime;
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@Schema(description = "所属用户id")
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private Integer userId;
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@Schema(description = "所属用户")
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private UserRespDTOWithout user;
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@Schema(description = "包含商品")
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private List<ProductRespDTOWithout> products;
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}

‎drawbluecup-common/src/main/java/com/drawbluecup/dto/product/ProductRespDTOWithOrders.java‎

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package com.drawbluecup.dto.product;
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import com.drawbluecup.convert.DTOConvertUtils;
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import com.drawbluecup.dto.order.OrderRespDTOWithUserAndProducts;
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import com.drawbluecup.entity.Order;
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import io.swagger.v3.oas.annotations.media.Schema;
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import lombok.Data;
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import java.util.List;
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@Data
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public class ProductRespDTOWithOrders {
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@Schema(description = "商品主键ID")// 文档里标注字段说明
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private Integer id; // 前端需要看的id
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@Schema(description = "商品名称")
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private String name; // 前端需要看的name
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@Schema(description = "拥有订单")
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private List<OrderRespDTOWithUserAndProducts> Orders ; // 前端需要看的name
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}

‎drawbluecup-common/src/main/java/com/drawbluecup/dto/product/ProductRespDTOWithout.java‎

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* 商品出参DTO：只包含前端需要展示的字段（比如id+name）
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*/
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@Data
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@Schema(name = "ProductRespDTO", description = "商品信息出参")// Swagger注解：文档里说明这个DTO的作用
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@Schema(name = "ProductRespDTOWithout", description = "商品信息出参")// Swagger注解：文档里说明这个DTO的作用
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public class ProductRespDTOWithout {
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@Schema(description = "商品ID")// 文档里标注字段说明
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@Schema(description = "商品主键ID")// 文档里标注字段说明
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private Integer id; // 前端需要看的id
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@Schema(description = "商品名称")

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