[스프링] @Configuration/ @Scope / 기존 코드 @Configuration 사용 한 코드

개발환경 

스프링 버전 : Spring Tool Suite 3.9.11 

JDK 1.8

톰켓 : 8.5

2021.05.17 - [분류 전체보기] - 스프링 다운로드 /STS 다운로드 (3.9.14 v 다운받기)서블릿/JDK 8 호환

스프링 다운로드 /STS 다운로드 (3.9.14 v 다운받기)서블릿/JDK 8 호환

2021.03.29 - [JAVA/JAVA(자바)설치 및 툴 이용(ECLIPSE)] - [JAVA] 자바 설치 및 환경 하기 JDK 1.8 버전/ 8버전

[JAVA] 자바 설치 및 환경 하기 JDK 1.8 버전/ 8버전

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Main 에서 실행 시키시면 됨니다 

 

기존 스프링 

===========

MainEntry.java

Client.java

porm.xml 

 

 

@Configuration

===========

MainEntry2.java

Client2.java

JavaConfig.java

springconf.xml 

 

@scop // prototype

============

MainPrototype.java

JavaCongigPrototype.java

springconfPrototype.xml

 

 

기존 방식 - xml 파일 설정

Client 클래스

package spring;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;

public class Client implements InitializingBean, DisposableBean {
    /////////////////////////////////////////////////
	public Client(){  //디폴트 생성자
		System.out.println("Client Default");
	}
	
	private String defaulthost;
	
	public Client(String defaulthost){  //매개변수 1개짜리 생성자함수
		this.defaulthost =defaulthost;
		System.out.println("Client 생성자 : " + this.defaulthost);
	}
	////////////////////////////////////////////////////
	
	
	private String host; 

	public void setHost(String host) {
		this.host = host;
		System.out.println("Client.setHost() method 실행");
	}

	
	//afterPropertiesSet : property injection 후에
	@Override
	public void afterPropertiesSet() throws Exception {
		System.out.println("Client.afterPropertiesSet() 실행");
	}

	public void send() {           /* <property name="host" value="서버" /> */
		System.out.println("Client.send() to " + host);    
	}

	
	//DisposableBean 대한 구현부 
	@Override
	public void destroy() throws Exception {         /* ctx.close(); */
		System.out.println("Client.destroy() 실행");
	}
	
}

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="client" class="spring.Client">
		<property name="host" value="서버" />
		<constructor-arg value="Default값"></constructor-arg>
	</bean>

	<!-- <bean id="client2" class="spring.Client2" 
			init-method="connect" destroy-method="close">
		<property name="host" value="서버2" />
	</bean> -->

</beans>

 

xml 파일 기반 실행

package main;

import org.springframework.context.support.GenericXmlApplicationContext;

import spring.Client;


public class MainEntry {
	public static void main(String[] args) {
		
		// xml 기반 설정 파일 이용한 실행
		GenericXmlApplicationContext ctx =
				new GenericXmlApplicationContext("classpath:springconf.xml");
		
		Client client = ctx.getBean("client", Client.class);
		Client c2 = ctx.getBean("client", Client.class);
		
		client.send();
		ctx.close();  // 스프링 컨테이너 닫기
		
		System.out.println(client.hashCode());
		System.out.println(c2.hashCode());
		
	}
}

 

출력 값

11:03:53.942 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 1 bean definitions from class path resource [springconf.xml]
11:03:53.944 [main] DEBUG org.springframework.context.support.GenericXmlApplicationContext - Refreshing org.springframework.context.support.GenericXmlApplicationContext@759ebb3d
11:03:53.975 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'client'
Client 생성자 : Default값
Client.setHost() method 실행
Client.afterPropertiesSet() 실행
Client.send() to 서버
11:03:54.027 [main] DEBUG org.springframework.context.support.GenericXmlApplicationContext - Closing org.springframework.context.support.GenericXmlApplicationContext@759ebb3d, started on Wed May 26 11:03:53 KST 2021
Client.destroy() 실행
811587677
811587677

---

@Configuration  사용

 

설정 파일로 쓸 자바 클래스 생성 

 

package conf;

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

import spring.Client2;

@Configuration
public class JavaConfig {

	
	// Client 빈객체로 등록 할때 
	//인터페이스를 구현 하는 코드를 Client2 가 가지고 있지 않아도 
	//초기화 시점 호출될 메소드 
	//소멸될 시점에 호출될 메소드 지정 해서 사용 할 수 있다 
	
	@Bean(initMethod = "connect", destroyMethod = "close")
	public Client2 client2() {
		Client2 client2 = new Client2();
		client2.setHost("서버2");
		return client2;
	}

}

 

Cleint2 클래스 

package spring;

public class Client2 {

	private String host;
	
	public void setHost(String host) {  //DI
		this.host = host;
		System.out.println("Client2.setHost() 실행");
	}

	
	public void connect() throws Exception {
		System.out.println("Client2.connect() 실행");
	}

	public void send() {
		System.out.println("Client2.send() to " + host);
	}

	//
	public void close() throws Exception {
		System.out.println("Client2.close() 실행");
	}

}

 

 

@Configuration 사용 

package main;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;

import spring.Client2;
import conf.JavaConfig;


//java @Configuration 로 설정파일 만드는것
public class MainEntry2 {

	public static void main(String[] args) {
		
		// annotation 기반 설정 파일 이용한 실행 - 자바 코드 작성 위치
		AbstractApplicationContext ctx = 	
				new AnnotationConfigApplicationContext(JavaConfig.class);
		
		Client2 client = ctx.getBean("client2", Client2.class);
		Client2 c2 = ctx.getBean("client2", Client2.class);
		
		client.send();
		ctx.close();
		
		System.out.println(client.hashCode()); // 싱글톤 방식이다
		System.out.println(c2.hashCode());
	}
}

 

출력값

11:30:51.486 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@45fe3ee3
11:30:51.500 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
11:30:51.601 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor'
11:30:51.603 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
11:30:51.605 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
11:30:51.606 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
11:30:51.611 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'javaConfig'
11:30:51.617 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'client2'
Client2.setHost() 실행
Client2.connect() 실행
Client2.send() to 서버2
11:30:51.649 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@45fe3ee3, started on Wed May 26 11:30:51 KST 2021
Client2.close() 실행
1279309678
1279309678

 

---

스코프 사용 이유

객체의 값을 다르게 이용 하고 싶을때 사용

범위 설정 

스프링은 기본적으로 싱글톤인데 

스코프를 사용 하면 prototype 으로 해서 같은 객체이지만 주소가 다르게 나온다 

package conf;

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

import spring.Client2;

@Configuration
public class JavaConfigPrototype {

	@Bean
	@Scope("prototype")
	public Client2 client2() {
		Client2 client2 = new Client2();
		client2.setHost("서버2");
		return client2;
	}

}

MainPrototype.java

package main;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;

import spring.Client;
import spring.Client2;
import conf.JavaConfigPrototype;

public class MainPrototype {

	public static void main(String[] args) {
		useXml();
		useJava();
	}

	private static void useXml() {
		
		GenericXmlApplicationContext ctx =
				new GenericXmlApplicationContext("classpath:springconfPrototype.xml");
		Client client1 = ctx.getBean("client", Client.class);
		Client client2 = ctx.getBean("client", Client.class);

		System.out.println("xml 설정 prototype: (client1 != client2) -> " + (client1 != client2));

		ctx.close();
		System.out.println(client1.hashCode());
		System.out.println(client2.hashCode());
	}

	private static void useJava() {
		AbstractApplicationContext ctx =
				new AnnotationConfigApplicationContext(JavaConfigPrototype.class);
		Client2 client1 = ctx.getBean("client2", Client2.class);
		Client2 client2 = ctx.getBean("client2", Client2.class);

		System.out.println("java 설정 prototype: (client1 != client2) -> " + (client1 != client2));

		ctx.close();
	}

}

springconfProrotype. xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="client" class="spring.Client"   scope="prototype">
		<property name="host" value="서버" />
	</bean>

</beans>

출력 값

 

11:08:56.679 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 1 bean definitions from class path resource [springconfPrototype.xml]
11:08:56.681 [main] DEBUG org.springframework.context.support.GenericXmlApplicationContext - Refreshing org.springframework.context.support.GenericXmlApplicationContext@4c98385c
Client Default
Client.setHost() method 실행
Client.afterPropertiesSet() 실행
Client Default
Client.setHost() method 실행
Client.afterPropertiesSet() 실행
xml 설정 prototype: (client1 != client2) -> true
11:08:56.753 [main] DEBUG org.springframework.context.support.GenericXmlApplicationContext - Closing org.springframework.context.support.GenericXmlApplicationContext@4c98385c, started on Wed May 26 11:08:56 KST 2021
1071097621
1897871865
11:08:56.785 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@71bbf57e
11:08:56.785 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
11:08:56.866 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor'
11:08:56.867 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
11:08:56.867 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
11:08:56.868 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
11:08:56.871 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'javaConfigPrototype'
Client2.setHost() 실행
Client2.setHost() 실행
java 설정 prototype: (client1 != client2) -> true
11:08:56.890 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@71bbf57e, started on Wed May 26 11:08:56 KST 2021

 

 

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