Spring Boot系列教程一：实现Hello World

一、利用idea创建一个project

1. file->New->project

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

3. 指定自己的工程名

4. 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