스프링 실습 예제 (외부 데이터 사용)

파일 구성
- resources : AppCTX.xml, admin.properties
- java : AdminConnection.java, MainClass.java
- 추가예정 : 주석, 분석

 

 

 

resources

<?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 = "adminConnection" class="com.javalec.ex.AdminConnection"/>
</beans>

 

 

 

admin.properties

admin.id=pej 
admin.pw=12345

 

 

 

AdminConnection.java

package com.javalec.ex;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.EnvironmentAware;
import org.springframework.core.env.Environment;

public class AdminConnection implements EnvironmentAware, InitializingBean, DisposableBean {
	// 의존성 주입은 의존성을 분리시켜 사용한다.
	private Environment env;
	
	private String adminId;
	private String adminPw;

	// 내부에 변수로 Environment 클래스를 사용함. AdminConnection클래스는 Environment클래스에 의존관계가 생기게 됨. 
	@Override
	public void setEnvironment(Environment env) { 
		// DI 의존주입: 내부가 아니라 외부에서 객체를 생성해 넣어준다.
		System.out.println("setsetEnvironment()");
		setEnv(env);
	}
	
	public Environment getEnv() {
		return env;
	}

	public void setEnv(Environment env) {
		this.env = env;
	}

	public String getAdminId() {
		return adminId;
	}

	public void setAdminId(String adminId) {
		this.adminId = adminId;
	}

	public String getAdminPw() {
		return adminPw;
	}

	public void setAdminPw(String adminPw) {
		this.adminPw = adminPw;
	}
	
	@Override
	public void afterPropertiesSet() throws Exception {
		System.out.println("AfterProperties");
		// 빈즈가 만드는 시점에 외부 데이터를 넣겠다는거임.
		setAdminId(env.getProperty("admin.id"));
		setAdminPw(env.getProperty("admin.pw"));
	}

	@Override
	public void destroy() throws Exception {
		System.out.println("destroy");		
	}
	
}

 

 

 

MainClass.java

package com.javalec.ex;

import java.io.IOException;

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.io.support.ResourcePropertySource;

public class MainClass {

	public static void main(String[] args) {
		ConfigurableApplicationContext ctx = new GenericXmlApplicationContext();
		
		ConfigurableEnvironment env = ctx.getEnvironment();
		MutablePropertySources propertySources = env.getPropertySources();
		
		try {
			propertySources.addLast(new ResourcePropertySource("classpath:admin.properties"));
			System.out.println(env.getProperty("admin.id"));
			System.out.println(env.getProperty("admin.pw"));
		}catch(IOException e) {}
		///////////////////////////////////
		GenericXmlApplicationContext gCtx = (GenericXmlApplicationContext)ctx;
		gCtx.load("AppCTX.xml");
		gCtx.refresh();
		
		AdminConnection adminConnection = gCtx.getBean("adminConnection",AdminConnection.class);
		System.out.println("admin ID : " + adminConnection.getAdminId());
		System.out.println("admin PW : " + adminConnection.getAdminPw());
		gCtx.close();
		ctx.close();
		// 빈즈를 쓰느냐 안쓰느냐차이
	}

}