一、新建前端查询课程名师接口

1、在service-edu模块创建controller

（1）查询最新前4条讲师数据

（2）查询最新前8条课程数据

@RestController
@RequestMapping("/eduservice/index")
@CrossOrigin
public class IndexController {

    @Autowired
    private EduCourseService courseService;
    @Autowired
    private EduTeacherService teacherService;

   //查询前8条热门课程，查询前4条名师
    @GetMapping("index")
    public R index() {
        //查询前8条热门课程
        QueryWrapper<EduCourse> wrapper = new QueryWrapper<>();
        wrapper.orderByDesc("id");
        wrapper.last("limit 8");
        List<EduCourse> eduList = courseService.list(wrapper);

        //查询前4条名师
        QueryWrapper<EduTeacher> wrapperTeacher = new QueryWrapper<>();
        wrapperTeacher.orderByDesc("id");
        wrapperTeacher.last("limit 4");
        List<EduTeacher> teacherList = teacherService.list(wrapperTeacher);

        return R.ok().data("eduList",eduList).data("teacherList",teacherList);
    }
}