在线教育项目-day08【课程大纲功能-显示章节】

一、先书写查询接口

1.创建两个实体类

@Data
public class ChapterVO {
    private String id;
    private String title;

    private List<VideoVO> children=new ArrayList<VideoVO>();
}

@Data
public class VideoVO {
    private String id;
    private String title;
}

2.给实体类

EduChapter

加注解

3.书写controller方法

@RestController
@CrossOrigin
@RequestMapping("/eduservice/edu-chapter")
public class EduChapterController {
    @Autowired
    EduChapterService chapterService;
    //根据课程id进行查询
    @GetMapping("getChapterVideo/{courseId}")
    public R getChapterVideo(@PathVariable String courseId){
       List<ChapterVO> list= chapterService.getChapterVideoBYcourseId(courseId);
       return R.OK().data("AllChapterVideo",list);
    }

}

4.service

public interface EduChapterService extends IService<EduChapter> {

    List<ChapterVO> getChapterVideoBYcourseId(String courseId);
}

5.serviceImpl

@Service
public class EduChapterServiceImpl extends ServiceImpl<EduChapterMapper, EduChapter> implements EduChapterService {

    @Autowired
    EduVideoService eduVideoService;
    @Override
    public List<ChapterVO> getChapterVideoBYcourseId(String courseId) {

        //1根据id查询出课程里面所有的章节
        QueryWrapper<EduChapter> wrapper=new QueryWrapper<>();
        wrapper.eq("course_id",courseId);
        List<EduChapter> Chapterlist=baseMapper.selectList(wrapper);

        //2根据id查询出课程里面所有的小节
        QueryWrapper<EduVideo> Videowrapper=new QueryWrapper<>();
        Videowrapper.eq("course_id",courseId);
        List<EduVideo> eduVideolist=eduVideoService.list(Videowrapper);

        List<ChapterVO> finalList=new ArrayList<>();


        //3便利查询章节list集合进行封装
        for (int i = 0; i < Chapterlist.size() ; i++) {
            EduChapter eduChapter=Chapterlist.get(i);
            //eduChapter对象里的值复制到ChapterVO里
            ChapterVO chapterVO=new ChapterVO();
            BeanUtils.copyProperties(eduChapter,chapterVO);
            finalList.add(chapterVO);

            List<VideoVO> videoList = new ArrayList<>();
            //4便利查询小节list集合进行封装
            for (int m = 0; m < eduVideolist.size() ; m++) {

                EduVideo eduVideo=eduVideolist.get(m);
                //eduChapter对象里的值复制到ChapterVO里

                //判断小节的chapter_id和章节的id是否一样
                if(eduVideo.getChapterId().equals(eduChapter.getId())){
                    VideoVO videoVO=new VideoVO();
                    BeanUtils.copyProperties(eduVideo,videoVO);
                    videoList.add(videoVO);
                }
            }
            chapterVO.setChildren(videoList);
        }

        return finalList;
    }
}

测试：

二、前端

当前页面

<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

    <el-form label-width="120px">

      <el-form-item>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
export default {
    data() {
        return {
            saveBtnDisabled:false
        }
    },
    created() {

    },
    methods:{
        previous() {
            this.$router.push({path:'/course/info/1'})
        },
        next() {
            //跳转到第二步
            this.$router.push({path:'/course/publish/1'})
        }
    }
}
</script>

 添加js

页面

<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="最终发布" />
    </el-steps>
    <ul>
      <li v-for="chapter in chapterVideoList" :key="chapter.id">
        <p>
          {{ chapter.title }}
          <span class="acts">
            <el-button style type="text" @click="openVideo(chapter.id)">添加小节</el-button>
            <el-button style type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
            <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
          </span>
        </p>
        <ul>
          <li v-for="video in chapter.children" :key="video.id">
            <p>
              {{ video.title }}
              <span class="acts">
                <el-button style type="text">编辑</el-button>
                <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>

    <div>
      <el-button @click="previous">上一步</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>
    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title" />
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number v-model="chapter.sort" :min="0" controls-position="right" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>
    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title" />
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right" />
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
          <!-- TODO -->
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

最终页面

 js代码

 data() {
    return {
      saveBtnDisabled: false,
      chapterVideoList: [],
      courseId: "",
      chapter:{ //封装章节数据
                title: '',
                sort: 0
            },
            video: {
                title: '',
                sort: 0,
                free: 0,
                videoSourceId: ''
            },
            dialogChapterFormVisible:false,//章节弹框
            dialogVideoFormVisible:false //小节弹框
      
    };
  },
  created() {
    //获取路由里的id值
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id;
    }
    //根据课程id查询章节和小节
    this.getChapterVideo();
  },
  methods: {
    //==============================小节操作====================================
        //删除小节
        removeVideo(id) {
            this.$confirm('此操作将删除小节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {  //点击确定，执行then方法
                //调用删除的方法
                video.deleteVideo(id)
                    .then(response =>{//删除成功
                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '删除小节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
            }) //点击取消，执行catch方法
        },
        //添加小节弹框的方法
        openVideo(chapterId) {
            //弹框
            this.dialogVideoFormVisible = true
            //设置章节id
            this.video.chapterId = chapterId
        },
        //添加小节
        addVideo() {
            //设置课程id
            this.video.courseId = this.courseId
            video.addVideo(this.video)
                .then(response => {
                    //关闭弹框
                    this.dialogVideoFormVisible = false
                    //提示
                    this.$message({
                        type: 'success',
                        message: '添加小节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        saveOrUpdateVideo() {
            this.addVideo()
        },

//==============================章节操作====================================
        //删除章节
        removeChapter(chapterId) {
            this.$confirm('此操作将删除章节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {  //点击确定，执行then方法
                //调用删除的方法
                chapter.deleteChapter(chapterId)
                    .then(response =>{//删除成功
                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '删除成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
            }) //点击取消，执行catch方法
        },
        //修改章节弹框数据回显
        openEditChatper(chapterId) {
            //弹框
            this.dialogChapterFormVisible = true
            //调用接口
            chapter.getChapter(chapterId)   
                .then(response => {
                    this.chapter = response.data.chapter
                })
        },
        //弹出添加章节页面
        openChapterDialog() {
            //弹框
            this.dialogChapterFormVisible = true
            //表单数据清空
            this.chapter.title = ''
            this.chapter.sort = 0
        },
        //添加章节
        addChapter() {
            //设置课程id到chapter对象里面
            this.chapter.courseId = this.courseId
            chapter.addChapter(this.chapter)
                .then(response => {
                    //关闭弹框
                    this.dialogChapterFormVisible = false
                    //提示
                    this.$message({
                        type: 'success',
                        message: '添加章节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        //修改章节的方法
        updateChapter() {
            chapter.updateChapter(this.chapter)
                .then(response =>  {
                    //关闭弹框
                    this.dialogChapterFormVisible = false
                    //提示
                    this.$message({
                        type: 'success',
                        message: '修改章节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        saveOrUpdate() {
            if(!this.chapter.id) {
                this.addChapter()
            } else {
                this.updateChapter()
            }
        },
        //根据课程id查询章节和小节
        getChapterVideo() {
            chapter.getAllChapterVideo(this.courseId)
                .then(response => {
                    this.chapterVideoList = response.data.allChapterVideo
                })
        },
    getChapterVideo() {
      chapter.getChapterVideo(this.courseId).then(response => {
        this.chapterVideoList = response.data.AllChapterVideo;
      });
    },
    previous() {
      this.$router.push({ path: "/course/info/1" });
    },
    next() {
      //跳转到第二步
      this.$router.push({ path: "/course/publish/1" });
    }
  }
};
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>