一、使用maven新建springboot

1. 新建maven项目

2. 修改`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><!-- 引入spring boot 统一版本父项目管理依赖 --><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.9.RELEASE</version><relativePath/></parent><groupId>com.lv</groupId><artifactId>autonomy</artifactId><version>0.0.1-SNAPSHOT</version><name>autonomy</name><description>Demo project for Spring Boot</description><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- 项目的热加载重启插件 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope><optional>true</optional></dependency></dependencies>
</project>

3. 创建项目启动文件

在lv包下新增java类 App.java

package com.lv;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);}
}