1:@Autowired

    @Autowired
    private OssService ossService;

2:在类的构造方法中给定义的接口赋值

    // set 注入service
    private EduSubjectService eduSubjectService;
    // 因为此类没有spring 管理，所以只能这种方式注入eduSubjectService
    public EduExcelListener(EduSubjectService eduSubjectService) {
        this.eduSubjectService = eduSubjectService;
    }

 在new对象时候把接口传进来

new EduExcelListener(eduSubjectService)