教育项目--章节模块【30】

绝地灬酷狼 2023-10-05 02:24 139阅读 0赞

## 章节模块 ##

这里进行的是课程中的章节以及小节的处理

--------------------

列表展示功能，剩下的功能可以自己添加

#### 章节 ####

*  章节模块
 *  前言
 *  一、思路分析
 *  二、使用步骤
 *   *  1.创建封装的Vo对象
     *  2.service层的方法的编写
     *  3.seivice Impl实现
     *  4.controller的调用
 *  三、测试

--------------------

## 前言 ##

在课程的基础上，我们有的思路跟课程是一样的。

--------------------

提示：以下是本篇文章正文内容，下面案例可供参考

## 一、思路分析 ##

在每一个课程中，有若干个的章节，每一个章节中又有多个的小节信息  
因此我们在章节模块的时候呢，还是两级分类的方法进行处理

## 二、使用步骤 ##

### 1.创建封装的Vo对象 ###

`VideoVo`

package com.djr.eduservice.entity.vo;
    
    import lombok.Data;
    
    /**
     * @Program:  小节封装返回类
     * @Description
     * @Author: 涛涛 * ^ *
     * @Create: 2021-02-03 14:32
     **/
    @Data
    public class VideoVo {
        
    
    
        private String id;
    
        private String title;
    }

`ChapterVo`

package com.djr.eduservice.entity.vo;
 
 import lombok.Data;
 
 import java.util.List;
 
 /**
 * @Program: 章节返回封装类
 * @Description
 * @Author: 涛涛 * ^ *
 * @Create: 2021-02-03 14:31
 **/
 @Data
 public class ChapterVo {
 
 
 
 private String id;
 
 private String title;
 
 private List<?> videoVos;
 
 
 }

### 2.service层的方法的编写 ###

`EduChapterService`

package com.djr.eduservice.service;
 
 import com.djr.eduservice.entity.EduChapter;
 import com.baomidou.mybatisplus.extension.service.IService;
 import com.djr.eduservice.entity.vo.ChapterVo;
 
 import java.util.List;
 
 /**
 * 
 * 课程 服务类
 * 
 *
 * @author taotao
 * @since 2021-02-01
 */
 public interface EduChapterService extends IService<EduChapter> {
 
 
 List<ChapterVo> getTreeList(String courseId);
 }

### 3.seivice Impl实现 ###

package com.djr.eduservice.service.impl;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.djr.eduservice.entity.EduChapter;
 import com.djr.eduservice.entity.EduVideo;
 import com.djr.eduservice.entity.vo.ChapterVo;
 import com.djr.eduservice.entity.vo.VideoVo;
 import com.djr.eduservice.mapper.EduChapterMapper;
 import com.djr.eduservice.service.EduChapterService;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import com.djr.eduservice.service.EduVideoService;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import java.util.ArrayList;
 import java.util.List;
 
 /**
 * 
 * 课程 服务实现类
 * 
 *
 * @author taotao
 * @since 2021-02-01
 */
 @Service
 public class EduChapterServiceImpl extends ServiceImpl<EduChapterMapper, EduChapter> implements EduChapterService {
 
 
 
 @Autowired
 EduVideoService eduVideoService;
 
 /**
 * 递归方式获取全部的章节信息
 * 获取顶级父类
 *
 * @return 集合
 */
 @Override
 public List<ChapterVo> getTreeList(String courseId) {
 
 
 //根据课程ID查询课程中的所有的章节
 QueryWrapper<EduChapter> chapterwapper = new QueryWrapper<>();
 chapterwapper.eq("course_id", courseId);
 chapterwapper.orderByAsc("sort","title");
 List<EduChapter> subjectList = baseMapper.selectList(chapterwapper);
 //根据课程ID查询课程中的所有的小节
 QueryWrapper<EduVideo> videoWapper = new QueryWrapper<>();
 videoWapper.eq("course_id", courseId);
 List<EduVideo> eduVideos = eduVideoService.list(videoWapper);
 
 
 //遍历查询章节list集合进行封装
 List<ChapterVo> chapterVos = new ArrayList<>();
 for (EduChapter eduChapter : subjectList) {
 
 ChapterVo chapterVo = new ChapterVo();
 BeanUtils.copyProperties(eduChapter, chapterVo);
 chapterVos.add(chapterVo);
 //遍历查询小节list集合进行封装
 List<VideoVo> videoVos = new ArrayList<>();
 
 for (EduVideo eduVideo : eduVideos) {
 
 if (eduVideo.getChapterId().equals(eduChapter.getId())) {
 
 VideoVo vo = new VideoVo();
 BeanUtils.copyProperties(eduVideo, vo);
 videoVos.add(vo);
 }
 }
 //将小节的集合放到章节集合属性
 chapterVo.setVideoVos(videoVos);
 }
 
 		return chapterVos;
 }
 
 }

### 4.controller的调用 ###

package com.djr.eduservice.controller;
 
 
 import com.djr.commonutils.R;
 import com.djr.eduservice.entity.vo.ChapterVo;
 import com.djr.eduservice.service.EduChapterService;
 import io.swagger.annotations.Api;
 import io.swagger.annotations.ApiOperation;
 import io.swagger.annotations.ApiParam;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
 
 /**
 * 
 * 课程 前端控制器--章节模块
 * 
 *
 * @author taotao
 * @since 2021-02-01
 */
 @RestController
 @RequestMapping("/eduservice/edu-chapter")
 @Api(description = "章节模块")
 @CrossOrigin
 public class EduChapterController {
 
 
 
 @Autowired
 private EduChapterService eduChapterService;
 
 @ApiOperation(value = "递归方式获取全部的章节信息")
 @GetMapping("{courseId}")
 public R getAllChapter(
 @ApiParam(name = "courseId", value = "课程ID")
 @PathVariable String courseId) {
 
 
 List<ChapterVo> chapterVos = eduChapterService.getTreeList(courseId);
 return R.ok()
 .data("items", chapterVos)
 .data("total", chapterVos.size());
 }
 
 
 }

## 三、测试 ##

![测试][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0phdmFiYWliYWk_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0phdmFiYWliYWk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20210203153620440.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0phdmFiYWliYWk=,size_16,color_FFFFFF,t_70