1 创建一个maven项目
![用idea写一个springboot的小demo(手动添加依赖) 用idea写一个springboot的小demo(手动添加依赖)](/default/index/img?u=aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzI0MS8wMmM4YjYzYTdhYTNlMjU3ZWExNDZiZTdlMDg0YmQwOS5wbmc=)
![用idea写一个springboot的小demo(手动添加依赖) 用idea写一个springboot的小demo(手动添加依赖)](/default/index/img?u=aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzgxOC81YjNlNThlNzdhYzM2YTlkZTA0MThkNWI2OTRiNjJhMi5wbmc=)
![用idea写一个springboot的小demo(手动添加依赖) 用idea写一个springboot的小demo(手动添加依赖)](/default/index/img?u=aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzk5Mi8xMzI4YWJjZDQxYjY4YWI3OWJjMTdlMzEwZjdkODg3OC5wbmc=)
2.添加pom.xml的依赖
![用idea写一个springboot的小demo(手动添加依赖) 用idea写一个springboot的小demo(手动添加依赖)](/default/index/img?u=aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzMyMy81M2UwOTk1OGE5ZDM1NTU2N2FiNjFmNWI2ZWMwMWI2My5wbmc=)
<!-- Spring boot 父引用-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent>
<dependencies>
<!-- Spring boot web依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
3.编写一个springboot启动类
![用idea写一个springboot的小demo(手动添加依赖) 用idea写一个springboot的小demo(手动添加依赖)](/default/index/img?u=aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzYyMC80MGYwYTkzM2Y0NWIyYjA4ZTM4ZTZmNGJhYzZhN2FiNC5wbmc=)
package com.yt;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @SpringBootApplication 来标注一个主程序类,说明这是一个springboot应用
*/
@SpringBootApplication
public class HelloWorldApplication {
public static void main(String[] args) {
//spring应用启动起来
SpringApplication.run(HelloWorldApplication.class,args);
}
}
4.编写一个controller
![用idea写一个springboot的小demo(手动添加依赖) 用idea写一个springboot的小demo(手动添加依赖)](/default/index/img?u=aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzM2My9iMjAzY2QzYzE1YWVhY2I2Y2UxNmE2N2VmZjA1ZWZiMy5wbmc=)
package com.yt.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class HelloController {
@ResponseBody
@RequestMapping("/hello")
public String hello(){
return "hello yt";
}
}
5.run 运行启动类
![用idea写一个springboot的小demo(手动添加依赖) 用idea写一个springboot的小demo(手动添加依赖)](/default/index/img?u=aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzcxMy8yOTdjZDc0MWQ0NTY1YmZmMjliNzRjNjI3NGIyZjQ5OS5wbmc=)
![用idea写一个springboot的小demo(手动添加依赖) 用idea写一个springboot的小demo(手动添加依赖)](/default/index/img?u=aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzUxMy9lZGZiNjY1YWE3ZDljNGRmMmExNmU4ZDNjYTFiY2M5MS5wbmc=)