스프링 구조를 이해하는 예제2(property의 사용)

applicationContext.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"

xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:p="http://www.springframework.org/schema/p"

xmlns:util="http://www.springframework.org/schema/util"

xmlns:task="http://www.springframework.org/schema/task"

xsi:schemaLocation="

        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd

                http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">          

<!-- 디폴트생성자로 객체생성 및 프로퍼티설정( 해당 class에 setter 필요) -->

<!-- 

<bean id="user1" class="com.test2.UserImpl">

<property name="name" value="안보여"/> property : xml에서 변수를 만들어 넘겨줄 때 사용 

<property name="age" value="20"/>

<property name="tel"> <property name="tel" value="010-1111-1111"/> 와 똑같다 

<value>010-1111-1111</value>

</property>

</bean>

-->

<bean id="user1" class="com.test2.UserImpl" p:name="밥먹자" p:age="10" p:tel="010"/><!-- p:사용할변수이름=사용할변수의밸류 -->

<!-- 프로퍼티를  의존관계 설정( 해당 class에 setter 필요) -->

<!--  

<bean id="userService" class="com.test2.UserService">

<property name="user" ref="user1"/>

</bean>

-->

<!-- scope 속성 : 빈의 범위 설정

singleton : 스프링 컨테이너에 한 개의 빈 객체만 설정(기본)

prototype : 빈을 사용할 때마다 객체를 생성

 -->

<!-- -XML 네임스페이스로 프로퍼티 의존관계 설정(setter 필요) xmlns:p="http://www.springframework.org/schema/p" 가 필요 -->

<bean id="userService" class="com.test2.UserService" p:user-ref="user1" scope="prototype"/>

</beans> 

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

ResultMain.java

package com.test2;

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ResultMain {

public static void main(String[] args){

AbstractApplicationContext context=new ClassPathXmlApplicationContext("com/test2/applicationContext.xml");

UserService service=(UserService)context.getBean("userService"); // bean id를 명시해줌

UserService service1=(UserService)context.getBean("userService");

//객체를 많이 만들어도 동일한 객체임(싱글톤 패턴 - 모든 인스턴스의 참조주소가 똑같다) - 설정파일에 scope를 선언하지 않으면 설정됨. 이것이 기본설정임

    // 설정파일에 scope를 prototype이라고 명시할 경우 만들때 마다 다른 객체 생성

System.out.println(service.getUserData());

System.out.println(service==service1);

System.out.println(service);

System.out.println(service1);

}

}

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

User.java

package com.test2;

public interface User {

public String result(); 

}

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

UserImpl.java

package com.test2;

public class UserImpl implements User{

private String name;

private int age;

private String tel;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public String getTel() {

return tel;

}

public void setTel(String tel) {

this.tel = tel;

}

@Override

public String result() {

String s=name+"님 나이는 "+age+"이고 전화는 "+tel;

return s;

}

}

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

UserService.java

package com.test2;

public class UserService {

private User user;

public void setUser(User user){

this.user=user;

}

public String getUserData(){

return user.result();

}

}

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

ResultMain.java를 실행시킨 결과

밥먹자님 나이는 10이고 전화는 010

false

com.test2.UserService@63b6f0eb

com.test2.UserService@7f830771