Reference another bean and set property : XML Bean « Spring « Java
Reference another bean and set property
File: context.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:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">
<bean id="encyclopedia" class="HardcodedEncyclopedia"/>
<bean id="oracle" class="BookwormOracle">
<property name="encyclopedia" ref="encyclopedia"/>
</bean>
</beans>
File: Main.java
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
public class Main {
public static void main(String[] a) {
XmlBeanFactory bf = new XmlBeanFactory(new ClassPathResource("context.xml"));
Oracle oracle = (Oracle) bf.getBean("oracle");
System.out.println("Meaning of life is " + oracle.defineMeaningOfLife());
}
}
interface Oracle {
String defineMeaningOfLife();
}
interface Encyclopedia {
Long findLong(String entry);
}
class BookwormOracle implements Oracle {
private Encyclopedia encyclopedia;
public String defineMeaningOfLife() {
Long ageOfUniverse = this.encyclopedia.findLong("AgeOfUniverse");
Long constantOfLife = this.encyclopedia.findLong("ConstantOfLife");
return String.valueOf(ageOfUniverse / constantOfLife);
}
public void setEncyclopedia(Encyclopedia encyclopedia) {
this.encyclopedia = encyclopedia;
}
}
class HardcodedEncyclopedia implements Encyclopedia {
private Map<String, Long> entryValues = new HashMap<String, Long>();
public HardcodedEncyclopedia() {
this.entryValues.put("AgeOfUniverse", 13700000000L);
this.entryValues.put("ConstantOfLife", 326190476L);
}
public Long findLong(String entry) {
return this.entryValues.get(entry);
}
}
Spring-XMLBasedBeanConfiguration.zip( 2,600 k)