Spring Boot系列教程一：实现Hello World

一、利用idea创建一个project

1. file->New->project

1. Spring initializr -> https://start.spring.io

1. 指定自己的工程名

1. 选择web 和spring boot版本，可以在pom.xml文件中修改

**
5.pom.xml自动生成的

<?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>

<!--父工程-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.springboot</groupId>
<artifactId>helloword</artifactId>
<version>1.0-SNAPSHOT</version>
<name>helloword</name>
<description>Demo project for Spring Boot</description>

<properties>
<java.version>1.8</java.version>
</properties>

<dependencies>
<!--引入web依赖-->
<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>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

二、编码

• 新建HelloController类

@RestController //@RestController =@Controller+@ResponseBody
public class HelloController {

@RequestMapping("/hello") //添加映射关系
public String hello(){
return "Hello World";
}

• 工程目录结构

三、启动测试

启动工程，springboot集成了tomcat

可以在application.properties中修改tomcat端口。server.port=8090

测试:成功输出