Springboot - Spring Context 다루기

개요) Spring Context에서 가볍게 다루는 실습을 해본다 

 

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1) Maven project 생성 

2) spring boot starter 메이븐 의존성 가져오기

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>3.3.2</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.in28minutes</groupId>
	<artifactId>learn-spring-framework</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>learn-spring-framework</name>
	<description>Demo project for Spring Boot</description>
	<url/>
	<licenses>
		<license/>
	</licenses>
	<developers>
		<developer/>
	</developers>
	<scm>
		<connection/>
		<developerConnection/>
		<tag/>
		<url/>
	</scm>
	<properties>
		<java.version>17</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</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>

 

 

3) 실행할 메인 클래스 생성

package com.in28minutes.learn_spring_framework;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class App02HelloWorldSpring {
	public static void main(String[] args) {
		var context = new AnnotationConfigApplicationContext(HelloWorldConfiguration.class);
		String name = (String)context.getBean("name");
		
		System.out.println(name);
	}
}

 

4) Spring Context의 파일 생성

package com.in28minutes.learn_spring_framework;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

record Person(String name, int age) {};

@Configuration
public class HelloWorldConfiguration {
	
	@Bean
	public String name() {
		return "Ranga";
	}
	
	@Bean
	public int age() {
		return 15;
	}
	
	@Bean
	public Person person() {
		return new Person("tomhoon", 30);
	}
}

 

 

 

JVM 위에 Spring framework가 올라간다.

Spring Framework는 Context를 공유하는데 그 안에 name의 Bean이 생성됨

Bean을 어디서나 꺼내어 사용가능함

 

 

 

 

 

출처: in28Minutes