三、Api模块

路径：com/imooc/controller/ItemController.java

package com.imooc.controller;

import com.imooc.enums.YesOrNo;
import com.imooc.pojo.*;
import com.imooc.pojo.vo.CategoryVO;
import com.imooc.pojo.vo.ItemInfoVO;
import com.imooc.pojo.vo.NewItemsVO;
import com.imooc.service.CarouselService;
import com.imooc.service.CategoryService;
import com.imooc.service.ItemService;
import com.imooc.utils.IMOOCJSONResult;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@Api(value = "商品接口",tags = "商品信息展示的相关接口")
@RestController
@RequestMapping("item")
public class ItemController {

    @Autowired
     private ItemService itemService;

    @ApiOperation(value="查询商品详情",notes = "查询商品详情",httpMethod = "GET")
    @GetMapping("/info/{itemId}")
    public IMOOCJSONResult info(
            @ApiParam(name = "itemId",value = "商品ID",required = true)
            @PathVariable() String itemId) {
         if (StringUtils.isBlank(itemId)) {

             return IMOOCJSONResult.errorMsg("");

         }


        Items item = itemService.queryItemById(itemId);
        List<ItemsImg> itemImgList=itemService.queryItemImgList(itemId);
        List<ItemsSpec> itemSpecList=itemService.queryItemSpecList(itemId);
        ItemsParam itemParam=itemService.queryItemParam(itemId);
        ItemInfoVO itemInfoVO=new ItemInfoVO();
        itemInfoVO.setItem(item);
        itemInfoVO.setItemImgList(itemImgList);
        itemInfoVO.setItemSpecList(itemSpecList);
        itemInfoVO.setItemParam(itemParam);

        return IMOOCJSONResult.ok(itemInfoVO);
    }

}

四、商品详情VO定义（用户返回到前端）

路径：com/imooc/pojo/vo/ItemInfoVO.java

package com.imooc.pojo.vo;

import com.imooc.pojo.Items;
import com.imooc.pojo.ItemsImg;
import com.imooc.pojo.ItemsParam;
import com.imooc.pojo.ItemsSpec;

import java.util.List;

/**
 * 商品详情VO
 */
public class ItemInfoVO {
    public Items getItem() {
        return item;
    }

    public void setItem(Items item) {
        this.item = item;
    }

    public List<ItemsImg> getItemImgList() {
        return itemImgList;
    }

    public void setItemImgList(List<ItemsImg> itemImgList) {
        this.itemImgList = itemImgList;
    }

    public List<ItemsSpec> getItemSpecList() {
        return itemSpecList;
    }

    public void setItemSpecList(List<ItemsSpec> itemSpecList) {
        this.itemSpecList = itemSpecList;
    }

    public ItemsParam getItemParam() {
        return itemParam;
    }

    public void setItemParam(ItemsParam itemParam) {
        this.itemParam = itemParam;
    }

    private Items item;
    private List<ItemsImg> itemImgList;
    private List<ItemsSpec> itemSpecList;
    private ItemsParam itemParam;
}