1.1 实现电商首页轮播图功能

在 foodie-dev-service 模块下的 com.imooc.service 包内创建 CarouselService 接口

package com.imooc.service;
import com.imooc.pojo.Carousel;
import java.util.List;
/**
 * Created by 92578 on 2020/8/22 16:17
 **/
public interface CarouselService {
    /**
     * 查询所有轮播图列表
     * @param isShow
     * @return
     */
    public List<Carousel> queryAll(Integer isShow);
}

在 foodie-dev-service 模块下的 com.imooc.service.impl 包内创建 CarouselServiceImpl 类

package com.imooc.service.impl;
import com.imooc.mapper.CarouselMapper;
import com.imooc.pojo.Carousel;
import com.imooc.service.CarouselService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import tk.mybatis.mapper.entity.Example;
import java.util.List;
/**
 * Created by 92578 on 2020/8/22 16:18
 **/
@Service
public class CarouselServiceImpl implements CarouselService {
    @Autowired
    private CarouselMapper carouselMapper;
    /**
     * 查询所有轮播图列表
     *
     * @param isShow
     * @return
     */
    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public List<Carousel> queryAll(Integer isShow) {
        Example example = new Example(Carousel.class);
        example.orderBy("sort").desc();
        Example.Criteria criteria = example.createCriteria();
        criteria.andEqualTo("isShow", isShow);
        List<Carousel> result = carouselMapper.selectByExample(example);
        return result;
    }
}

在 foodie-dev-common 模块下的 com.imooc.enums 包内创建 YseOrNo 枚举

package com.imooc.enums;
/**
 * 是否枚举
 * Created by 92578 on 2020/8/16 20:38
 **/
public enum YseOrNo {
    NO(0, "否"),
    YES(1, "是");
    public final Integer type;
    public final String value;
    YseOrNo(Integer type, String value) {
        this.type = type;
        this.value = value;
    }
}

在 foodie-dev-api 模块下的 com.imooc.controller 包内创建 IndexController 类

package com.imooc.controller;
import com.imooc.enums.YseOrNo;
import com.imooc.pojo.Carousel;
import com.imooc.service.CarouselService;
import com.imooc.utils.IMOOCJSONResult;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
/**
 * Created by 92578 on 2020/8/22 16:30
 **/
@Api(value = "首页", tags = {"首页展示的相关接口"})
@RestController
@RequestMapping("index")
public class IndexController {
    @Autowired
    private CarouselService carouselService;
    @ApiOperation(value = "获取首页轮播图列表", notes = "获取首页轮播图列表", httpMethod = "GET")
    @GetMapping("/carousel")
    public IMOOCJSONResult carousel(){
        List<Carousel> list =carouselService.queryAll(YseOrNo.YES.type);
        return IMOOCJSONResult.ok(list);
    }
}

启动项目，访问 http://localhost:8080/foodie-shop/index.html 轮播图图片加载成功