Java/Spring/IoC Collections

Collection Injection

   <source lang="java">

/* Pro Spring By Rob Harrop Jan Machacek ISBN: 1-59059-461-4 Publisher: Apress

• /

/////////////////////////////////////////////////////////////////////////////////////// //File: beans.xml <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans>

   <bean id="oracle" name="wiseworm" class="BookwormOracle"/>
   
   <bean id="injectCollection" class="CollectionInjection">
       <property name="map">
           <map>
               <entry key="someValue">
                   <value>Hello World!</value>
               </entry>
               <entry key="someBean">
                   <ref local="oracle"/>
               </entry>
           </map>
       </property>
       <property name="props">
           <props>
               <prop key="firstName"> Rob </prop>
               <prop key="secondName"> Harrop </prop>
           </props>
       </property>
       <property name="set">
           <set>
               <value>Hello World!</value>
               <ref local="oracle"/>
           </set>
       </property>
       <property name="list">
           <list>
               <value>Hello World!</value>
               <ref local="oracle"/>
           </list>
       </property>
   </bean>

</beans> /////////////////////////////////////////////////////////////////////////////////////// public interface Oracle {

   public String defineMeaningOfLife();

} /////////////////////////////////////////////////////////////////////////////////////// public class Encyclopedia { }

/////////////////////////////////////////////////////////////////////////////////////// public class BookwormOracle implements Oracle {

   private Encyclopedia enc;
   public void setEncyclopedia(Encyclopedia enc) {
       this.enc = enc;
   }
   public String defineMeaningOfLife() {
       return "Encyclopedia"s are a waste of money - use the Internet";
   }

} /////////////////////////////////////////////////////////////////////////////////////// import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Properties; import java.util.Set; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.xml.XmlBeanFactory; import org.springframework.core.io.FileSystemResource; public class CollectionInjection {

   private Map map;
   private Properties props;
   private Set set;
   private List list;
   public static void main(String[] args) {
       BeanFactory factory = new XmlBeanFactory(new FileSystemResource(
               "build/beans.xml"));
       CollectionInjection instance = (CollectionInjection) factory.getBean("injectCollection");
       instance.displayInfo();
   }
   public void setList(List list) {
       this.list = list;
   }
   public void setSet(Set set) {
       this.set = set;
   }
   public void setMap(Map map) {
       this.map = map;
   }
   public void setProps(Properties props) {
       this.props = props;
   }
   public void displayInfo() {
       // display the Map
       Iterator i = map.keySet().iterator();
       System.out.println("Map contents:\n");
       while (i.hasNext()) {
           Object key = i.next();
           System.out.println("Key: " + key + " - Value: " + map.get(key));
       }
       // display the properties
       i = props.keySet().iterator();
       System.out.println("\nProperties contents:\n");
       while (i.hasNext()) {
           String key = i.next().toString();
           System.out.println("Key: " + key + " - Value: "
                   + props.getProperty(key));
       }
       // display the set
       i = set.iterator();
       System.out.println("\nSet contents:\n");
       while (i.hasNext()) {
           System.out.println("Value: " + i.next());
       }
       // display the list
       i = list.iterator();
       System.out.println("\nList contents:\n");
       while (i.hasNext()) {
           System.out.println("Value: " + i.next());
       }
   }

}

      </source>