我在使用 SpringMVC 中的 AbstractAnnotationConfigDispatcherServletInitializer 来实现使用 java 配置 servlet。

我在访问 localhost:8080/ 出现的是 404 错误，下面是相关代码

WebAppInitializer

public class SpittrWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class<?>[]{ WebConfig.class };
    }

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class<?>[]{ RootConfig.class };
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

WebConfig

@Configuration
@EnableWebMvc
@ComponentScan("spittr.web")
public class WebConfig extends WebMvcConfigurerAdapter{
    @Bean
    public ViewResolver viewResolver(){
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setExposeContextBeansAsAttributes(true);
        return resolver;
    }
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
}

HomeController

@Controller
public class HomeController {
    @RequestMapping(value = "/",method = GET)
    public String home(){
        return "home";
    }
}

home.jsp 文件在 WEB-INF/views/ 下

Maven

 <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version> 4.1.5.RELEASE</version>
            <exclusions>
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        ...
    </dependencies>

请问一下，为什么我在访问 `localhost:8080/` 出现的是 404 错误