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mediante el uso de bean de padre Las propiedades, podemos especificar la relación de herencia entre los beans. En este caso, los valores del bean padre se heredarán al bean actual.
Veamos un ejemplo simple de herencia de bean.
Employee.java
Esta clase contiene tres atributos, tres constructores y el método show() para mostrar valores.
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></constructor-arg> <constructor-arg value="Sachin"></constructor-arg> </bean> <bean id="address1" class="com.w3codebox.Address"> <constructor-arg value="21,Lohianagar"></constructor-arg> <constructor-arg value="Ghaziabad"></constructor-arg> <constructor-arg value="UP"></constructor-arg> <constructor-arg value="USA"></constructor-arg> </bean> <bean id="e2" class="com.w3codebox.Employee" parent="e1"> <constructor-arg ref="address1></constructor-arg> </bean> </beans>
Test.java
Esta clase obtiene el Bean del archivo applicationContext.xml y llama al método show.
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(); } }