@RequestMapping("/list")
    public TableDataInfo list(CourseInfo courseInfo){
        System.out.println(courseInfo.toString());
        Integer pageNum = courseInfo.getPageNum();
        Integer pageSize = courseInfo.getPageSize();
        String orderBy = courseInfo.getOrderBy();
        PageUtils.startMyPage(pageNum,pageSize,orderBy);
        List<CourseInfo> courseInfoList = courseService.selectCourseInfoList(courseInfo);
        return PageUtils.getMyDataTable(courseInfoList);
    }