1. 使用IDEA创建SpringBoot项目

1.打开IDEA,创建新项目，选择Spring Initializr

2.输入Artifact

3.勾选Web

4.点击finish完成

5.进入项目，可以将以下内容删除

pom.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
 
	<groupId>com.example</groupId>
	<artifactId>springbootdemo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>
 
	<name>springbootdemo</name>
	<description>Demo project for Spring Boot</description>
 
	<!--起步依赖-->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.2.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
 
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>
 
	<dependencies>
		<!--开发web项目相关依赖-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!--springboot单元测试-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>
 
	<!--maven构建-->
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
 
 
</project>

6.创建一个HelloController

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package com.example;
 
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,this is a springboot demo";
    }
}

7.程序自动生成的SpringbootdemoApplication，会有一个@SpringBootApplication的注解，这个注解用来标明这个类是程序的入口

package com.example;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
//入口
@SpringBootApplication
public class SpringbootdemoApplication {
    
    
 
	public static void main(String[] args) {
    
    
		SpringApplication.run(SpringbootdemoApplication.class, args);
	}
}

@SpringBootApplication开启了Spring的组件扫描和springboot的自动配置功能，相当于将以下三个注解组合在了一起

（1）@Configuration：表名该类使用基于Java的配置,将此类作为配置类

（2）@ComponentScan：启用注解扫描

（3）@EnableAutoConfiguration：开启springboot的自动配置功能

8.运行SpringbootdemoApplication类
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