2016년 9월 21일 수요일

[자바교육,스프링교육추천◆탑크리에듀]#21.컬렉션을이용한빈주입(XML,어노테이션방식)

#21.컬렉션을이용한빈주입(XML,어노테이션방식)

컬렉션 주입(Collection Injection), XML 방식
n  빈에서 개별 빈 이나 값이 아닌 객체의 컬렉션에  접근해야 되는 경우가 있는데 <list>, <map>, <set>, <prop>를 사용한다.자바에서 Properties 클래스는 property 값으로 String을 지원하므로 String만 넘길 수 있다.

[app-context5.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-4.2.xsd">
<bean id="onj" name="onjName" class="onj.injection.collection.Onj"/>
<bean id="sample" class="onj.injection.collection.CollectionExam">
<property name="map">
           <map>
                     <entry key="someValue">
                                <value>hello map...</value>
                     </entry>
                     <entry key="someBean">
                                <ref bean="onj"/>
                     </entry>
           </map>
</property>

<property name="set">
           <set>
                     <value>hello list...</value>
                     <ref bean="onj"/>
           </set>
</property>

<property name="props">
           <props>
                     <prop key="firstName">Jong Cheol</prop>
                     <prop key="lastName">Lee</prop>
           </props>
</property>
</bean>
</beans>

[CollectionExam.java]
public void display() {
           for(Map.Entry<String, Object> entry:map.entrySet()) {
             System.out.println("Key: " + entry.getKey() + "-" + entry.getValue());
           }

           for(Map.Entry<Object, Object> entry : props.entrySet()) {
             System.out.println("key : " + entry.getKey() + "-" + entry.getValue() );
           }

           for(Object obj : set) {
              System.out.println("value : " + obj);
           }
}
public static void main(String[] args) {
           GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();
           ctx.load("classpath:app-context5.xml");
           ctx.refresh();
           CollectionExam col =  (CollectionExam)ctx.getBean("sample“)
           col.display();

}

컬렉션 주입(Collection Injection), 어노테이션 방식

[app-context6.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:context="http://www.springframework.org/schema/context"
        xmlns:util="http://www.springframework.org/schema/util"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
               http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
               http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">
<context:annotation-config/>
<context:component-scan base-package="onj.collection.annotation" />
<bean id="onj" name="onjName" class="onj.collection.annotation.Onj"/>
<util:map id="map" map-class="java.util.HashMap">
<entry key="someValue">
<value>hello... map</value>
</entry>
<entry key="someBean">
<ref ben="onj"/>
</entry>
</util:map>

<util:properties id="props">
<prop key="firstName">Jong Cheol</prop>
<prop key="lastName">Lee</prop>
</util:properties>

<util:set id="set">
<value>hello.... set</value>
<ref bean="onj"/>
</util:set>
</beans>

[Onj.java]
package onj.collection.annotation;

import org.springframework.stereotype.Service;

@Service("onj")
public class Onj {
           public String toString() {
                     return "my name is OnJ";
           }
}

[CollectionAnnotationExam.java]
@Service("sample")
public class CollectionAnnotationExam {

@Resource(name="map")
private Map<String, Object> map ;

@Resource(name="props")
private Properties props;

@Resource(name="set")
private Set<Object> set;


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