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需求：使用SpringBoot开发一个Web应用，浏览器发起请求/hello后，给浏览器返回字符串”Hello world”

1、创建Maven工程
2、导入spring-boot-starter-web依赖
3、编写Controller

package com.walker.controller;

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

@RestController
public class HelloController {

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

4、启动类

package com.walker;

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

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

5、访问http:localhost:8080/hello