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을 사용하여 bean 의 parent 속성을 통해 Bean 간의 상속 관계를 지정할 수 있습니다. 이 경우 부모 Bean의 값이 현재 Bean으로 상속됩니다。
bean을 상속받은 간단한 예제를 보겠습니다。
Employee.java
이 클래스는 세 가지 속성, 세 가지 생성자 및 값을 표시하는 show() 메서드를 포함하고 있습니다。
package com.w3codebox;
public class Employee {
private int id;
private String name;
private Address address;
public Employee() {}
public Employee(int id, String name) {
super();
this.id = id;
this.name = name;
}
public Employee(int id, String name, Address address) {
super();
this.id = id;
this.name = name;
this.address = address;
}
void show(){
System.out.println(id+" ""+name);
System.out.println(address);
}
}
Address.java
package com.w3codebox;
public class Address {
private String addressLine1, city, state, country;
public Address(String addressLine1, String city, String state, String country) {
super();
this.addressLine1 = addressLine1;
this.city = city;
this.state = state;
this.country = country;
}
public String toString(){
return addressLine1+" ""+city+" ""+state+" ""+country;
}
}
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:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="e1" class="com.w3codebox.Employee"> <constructor-arg value="101">/생성자-arg> <constructor-arg value="Sachin"></생성자-arg> </bean> <bean id="address1" class="com.w3codebox.Address"> <constructor-arg value="21,Lohianagar"></생성자-arg> <constructor-arg value="Ghaziabad"></생성자-arg> <constructor-arg value="UP"></생성자-arg> <constructor-arg value="USA"></생성자-arg> </bean> <bean id="e2" class="com.w3codebox.Employee" parent="e1"> <constructor-arg ref="address1">/생성자-arg> </bean> </beans>
Test.java
이 클래스는 applicationContext.xml 파일에서 Bean을 가져와 show 메서드를 호출합니다.
package com.w3codebox;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
public class Test {
public static void main(String[] args) {
Resource r=new ClassPathResource("applicationContext.xml");
BeanFactory factory=new XmlBeanFactory(r);
Employee e1=(Employee)factory.getBean("e2");
e1.show();
}
}