본문 바로가기
웹 프로그래밍(풀스택-->java)/웹프로그래밍(백엔드-->java)

61. 주입

by 백엔드개발자0107 2021. 12. 26. 

package kr.co.softcampus.config;

import org.springframework.beans.factory.annotation.Autowire;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import kr.co.softcampus.beans.DataBean1;
import kr.co.softcampus.beans.DataBean2;
import kr.co.softcampus.beans.DataBean3;
import kr.co.softcampus.beans.TestBean1;
import kr.co.softcampus.beans.TestBean2;
import kr.co.softcampus.beans.TestBean3;

//TestBean1.java 파일에서 정의한 변수와 메소드에 값을 맵핑하는 부분 

@Configuration
public class BeanConfigClass {

	@Bean
	public TestBean1 java1() {
		
		return new TestBean1(200,"문자열",new DataBean1());
		
	}
	
	@Bean
	public TestBean1 java2() {
		
		TestBean1 t1 = new TestBean1();
		t1.setData1(400);
		t1.setData2("문자열4");
		t1.setData3(new DataBean1());
		
		return t1;
	}
	
	
	@Bean
	public DataBean2 data1() {
		
		return new DataBean2();
		
	}
	
	@Bean
	public DataBean2 data2() {
		
		return new DataBean2();
		
	}
	
	
	@Bean(autowire = Autowire.BY_NAME)
	public TestBean2 java3() {
		
		return new TestBean2();
		
	}
	
	@Bean
	public DataBean3 data100() {
		
		return new DataBean3();
		
	}
	
	@Bean
	public TestBean3 java4() {
		
		return new TestBean3();
		
	}
	
}

직접 주입하는 방법과 자동주입하는 방법 두가지를 보자.!

 

 

 

MainClass.java

 

package kr.co.softcampus.main;

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

import kr.co.softcampus.beans.TestBean1;
import kr.co.softcampus.beans.TestBean2;
import kr.co.softcampus.beans.TestBean3;
import kr.co.softcampus.config.BeanConfigClass;

//TestBean1.java와 BeanConfigClass.java파일에서 정의하고 생성한 변수와 메소드를 실행시켜주는 부분 

public class MainClass {

	public static void main(String[] args) {
		
		ClassPathXmlApplicationContext ctx1 = new ClassPathXmlApplicationContext("kr/co/softcampus/config/beans.xml");
		
		TestBean1 xml1 = ctx1.getBean("xml1",TestBean1.class);
		
		System.out.printf("xml1.data1 : %d\n",xml1.getData1());
		System.out.printf("xml1.data2 : %d\n",xml1.getData2());
		System.out.printf("xml1.data3 : %d\n",xml1.getData3());
		
		System.out.println("----------------------------");
		
		TestBean1 xml2 = ctx1.getBean("xml2",TestBean1.class);
		
		System.out.printf("xml2.data1 : %d\n",xml2.getData1());
		System.out.printf("xml2.data2 : %d\n",xml2.getData2());
		System.out.printf("xml2.data3 : %d\n",xml2.getData3());
		
		TestBean2 xml3 = ctx1.getBean("xml3",TestBean2.class);
		System.out.printf("xml3.data1 : %s\n",xml3.getData1());
		System.out.printf("xml3.data2 : %s\n",xml3.getData2());
		
		TestBean3 xml4 = ctx1.getBean("xml4",TestBean3.class);
		System.out.printf("xml4.data1 : %s\n",xml4.getData1());
		System.out.printf("xml4.data2 : %s\n",xml4.getData2());		
		
		ctx1.close();
		
		System.out.println("============================");
		
		AnnotationConfigApplicationContext ctx2 = new AnnotationConfigApplicationContext(BeanConfigClass.class);
		
		TestBean1 java1= ctx2.getBean("java1",TestBean1.class);
		
		System.out.println("============================");
		
		TestBean1 java2 = ctx2.getBean("java2",TestBean1.class);
		System.out.printf("java2.data1 : %d\n",java2.getData1());
		System.out.printf("java2.data2 : %d\n",java2.getData2());
		System.out.printf("java2.data3 : %d\n",java2.getData3());
		
		TestBean2 java3 = ctx2.getBean("java3",TestBean2.class);
		System.out.printf("java3.data1 : %s\n",java3.getData1());
		System.out.printf("java3.data2: %s\n",java3.getData2());
		
		TestBean2 java4 = ctx2.getBean("java3",TestBean2.class);
		System.out.printf("java4.data1 : %s\n",java4.getData1());
		System.out.printf("java4.data2: %s\n",java4.getData2());
		
		ctx2.close();
		
	}
	
}

 

beans.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 = "xml1" class="kr.co.softcampus.beans.TestBean1" lazy-init="true">
	<constructor-arg value="100" type="int" index="0"/>
	<constructor-arg value="문자열1" type="int" index="1"/>
	<constructor-arg ref = "data_bean1" index="2"/>
	<!-- //<constructor-arg ref = "data_bean1" index="2"/> ref="data_bean1"은 객체를 생성하고 선언할떄 xml에서 쓰인다.-->
	
	</bean>

	<bean id="xml2" class="kr.co.softcampus.beans.TestBean1" lazy-init="true">
		<property name="data1" value="300"/>
		<property name="data2" value="문자열3"/>
		<property name="data3" ref="data_bean1"/>
		
	</bean>

	<bean id = "data_bean1" class="kr.co.softcampus.beans.DataBean1"/>


	<bean id="data1" class="kr.co.softcampus.DataBean2"/>
	<bean id="data2" class="kr.co.softcampus.DataBean2"/>


	<bean id="xml3" class="kr.co.softcampus.beans.TestBean2" lazy-init="true" autowire="byName"/>
	<!-- autowire="byName"은 value가 자동 주입된다.  -->
	
	<bean class="kr.co.softcampus.beans.DataBean3"/>
	<bean id="xml4" class="kr.co.softcampus.beans.TestBean3"/>
	
	</beans>

 

BeanConfigClass.java

 

package kr.co.softcampus.config;

import org.springframework.beans.factory.annotation.Autowire;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import kr.co.softcampus.beans.DataBean1;
import kr.co.softcampus.beans.DataBean2;
import kr.co.softcampus.beans.DataBean3;
import kr.co.softcampus.beans.TestBean1;
import kr.co.softcampus.beans.TestBean2;
import kr.co.softcampus.beans.TestBean3;

//TestBean1.java 파일에서 정의한 변수와 메소드에 값을 맵핑하는 부분 

@Configuration
public class BeanConfigClass {

	@Bean
	public TestBean1 java1() {
		
		return new TestBean1(200,"문자열",new DataBean1());
		
	}
	
	@Bean
	public TestBean1 java2() {
		
		TestBean1 t1 = new TestBean1();
		t1.setData1(400);
		t1.setData2("문자열4");
		t1.setData3(new DataBean1());
		
		return t1;
	}
	
	
	@Bean
	public DataBean2 data1() {
		
		return new DataBean2();
		
	}
	
	@Bean
	public DataBean2 data2() {
		
		return new DataBean2();
		
	}
	
	
	@Bean(autowire = Autowire.BY_NAME)
	public TestBean2 java3() {
		
		return new TestBean2();
		
	}
	
	@Bean
	public DataBean3 data100() {
		
		return new DataBean3();
		
	}
	
	@Bean
	public TestBean3 java4() {
		
		return new TestBean3();
		
	}
	
}

 

DataBean1.java

 

package kr.co.softcampus.beans;

public class DataBean1 {

}

 

DataBean2.java

 

package kr.co.softcampus.beans;

public class DataBean2 {

}

 

DataBean3.java

 

package kr.co.softcampus.beans;

public class DataBean3 {

}

TestBean1.java

 

package kr.co.softcampus.beans;


//변수와 메소드를 정의하는 부분 
public class TestBean1 {

	private int data1;
	private String data2;
	private DataBean1 data3;
	
	public TestBean1() {
		
		
		
	}
	
	
	public TestBean1(int data1,String data2,DataBean1 data3) {
		
		this.data1 = data1;
		this.data2  =data2;
		this.data3 = data3;
		
	}
	
	
	public int getData1() {
		return data1;
	}
	public void setData1(int data1) {
		this.data1 = data1;
	}
	public String getData2() {
		return data2;
	}
	public void setData2(String data2) {
		this.data2 = data2;
	}
	public DataBean1 getData3() {
		return data3;
	}
	public void setData3(DataBean1 data3) {
		this.data3 = data3;
	}
	
	
	
	
}

 

 

TestBean2.java

 

package kr.co.softcampus.beans;

public class TestBean2 {
	private DataBean2 data1;
	private DataBean2 data2;
	
	
	public DataBean2 getData1() {
		return data1;
	}
	public void setData1(DataBean2 data1) {
		this.data1 = data1;
	}
	public DataBean2 getData2() {
		return data2;
	}
	public void setData2(DataBean2 data2) {
		this.data2 = data2;
	}
	
	
	
}

 

 

TestBean3.java

 

package kr.co.softcampus.beans;

public class TestBean3 {

	private DataBean3 data1;
	private DataBean3 data2;
	
	
	public DataBean3 getData1() {
		return data1;
	}
	public void setData1(DataBean3 data1) {
		this.data1 = data1;
	}
	public DataBean3 getData2() {
		return data2;
	}
	public void setData2(DataBean3 data2) {
		this.data2 = data2;
	}
	
}

 

 

'웹 프로그래밍(풀스택-->java) > 웹프로그래밍(백엔드-->java)' 카테고리의 다른 글

60. Init,destroy 메서드  (0) 2021.12.25
59. Java 코드를 활용한 빈 등록  (0) 2021.12.25
58. 자동주입  (0) 2021.12.24
57. 컬렉션 주입  (0) 2021.12.22
56. Setter 메서드를 통한 주입  (0) 2021.12.20

관련글

티스토리툴바