spring加载templates下的HTML页面报404

1.导入依赖包

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
    <version>2.0.0.BUILD-SNAPSHOT</version>
</dependency>

2.controller调用

@RequestMapping(value = "/Data")
@Controller
public class DataController {
    @Autowired
    DataService dataService;

    @RequestMapping(value = "/index")
    public ModelAndView getIndex(){
        ModelAndView view = new ModelAndView();
        view.setViewName("index");
        return view;
    }

}

3.配置文件及路径