springboot整合EasyExcle问题

为什么说SubjectExcelListener不能交给spring进行管理？

//注入也成功了，为什么老师说SubjectExcelListener不能交给spring进行管理？？？
@Component
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {
    //SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其它对象
    //因此无法通过spring操作数据库==>可以通过创建jdbc连接
    //===>手动注入===>在本类中可以调用subjectService的方法
//    public EduSubjectService subjectService;
//    public SubjectExcelListener() {
//    }
//    public SubjectExcelListener(EduSubjectService subjectService) {
//        this.subjectService = subjectService;
//    }
    @Autowired
    EduSubjectService subjectService;
    //读取excel内容，一行一行读取
    @Override
    public void invoke(SubjectData data, AnalysisContext context) {
        if (data == null){
            throw new GuliException(20001,"文件数据为空");
        }
        //一行一行读，每次读取有两个值，第一个值，一级分类，第二个值，二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, data.getOneSubjectName());
        if (existOneSubject == null){ //没有相同的一级分类,进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(data.getOneSubjectName());//一级分类名称
            subjectService.save(existOneSubject);
        }
        //获取一级分类id值
        String pid = existOneSubject.getId();
        //添加二级分类
        //判断一级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, data.getTwoSubjectName(), pid);
        if (existTwoSubject == null){
            existTwoSubject = new EduSubject();
            existTwoSubject.setTitle(data.getTwoSubjectName());
            existTwoSubject.setParentId(pid);
            subjectService.save(existTwoSubject);
        }
    }

    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService, String name){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject oneSubject = subjectService.getOne(wrapper);//根据wrapper条件查数据库对象
        return oneSubject;
    }
    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService, String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {

    }
}

@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {
    @Autowired
    SubjectExcelListener subjectExcelListener;

    //添加课程分类
    @Override
    public void saveSubject(MultipartFile file,EduSubjectService subjectService) {
        try {
            //文件输入流
            InputStream in = file.getInputStream();
            //调用方法进行读取
            EasyExcel.read(in, SubjectData.class,subjectExcelListener).sheet().doRead();
        }catch (Exception e){
            e.printStackTrace();
        }
    }

 

不知道你这个问题是否已经解决, 如果还没有解决的话:

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