1 创建项目

SpringBoot要求，项目要继承SpringBoot的起步依赖spring-boot-starter-parent

pom.xml
中 添加

<parent>
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-parent</artifactId> 
    <version>2.0.1.RELEASE</version>
</parent>

SpringBoot要集成SpringMVC进行Controller的开发，所以项目要导入web的启动依赖

<dependencies> 
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId> 
    </dependency>
</dependencies>

MySpringBootApplication.java

package cn.kylin;

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

/**
 * Hello World!
 *
 */
@SpringBootApplication
public class MySpringBootApplication {

    public static void main(String[] args) {
        System.out.println("启动 Spring Boot...");
        SpringApplication.run(MySpringBootApplication.class, args);
    }
}

QuickController.java

package cn.kylin.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;


@Controller
public class QuickController {

    @GetMapping("/hello")
    @ResponseBody
    public String hello() {
        return "hello,world";
    }
}