spring-boot页面跳转失败，请指教，谢谢！！！

Question

App类：

 package com.yss.springboot.application;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App {

    public static void main(String[] args) {

        SpringApplication.run(App.class, args);
    }
}

HelloWorldController类：

 package com.yss.springboot.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Hello World
 * @author yss
 *
 */
@RestController
public class HelloWorldController {

    @RequestMapping("/")
    public String sayHello() {
        return "Hello World!";
    }
}

浏览器输入:localhost:8080页面错误，无法跳转！

Answer 1

@RestController 换成 @Controller在试试