spring bean之间的关系：继承；依赖「建议收藏」

package com.coslay.beans.relation;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.coslay.beans.autowire.Address;
import com.coslay.beans.autowire.Person;

public class Main {
	public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-relation.xml");
		
		Address address = (Address) ctx.getBean("address3");
		System.out.println(address);
		
		address = (Address) ctx.getBean("address2");
		System.out.println(address);
		
		Person person = (Person) ctx.getBean("person");
		System.out.println(person);
	}
}

beans-relation.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.xsd">

	<!-- 抽象bean：bean的abstract属性为true的bean。这样bean不能被IOC容器实例化。仅仅能用来被继承继承 
		若某一个bean的class属性没有指定，则该bean必须是一个抽象bean-->	
	<bean id="address" 
		p:city="Beijing" p:street="WuDaoKou" abstract="true"></bean>
		
	<!-- <bean id="address2" class="com.coslay.beans.autowire.Address"
		p:city="Beijing" p:street="DaZhongSi"></bean> -->
	<!-- bean 配置的继承：使用bean 的parent 属性指定继承哪个baen的配置 -->
	<bean id="address2" class="com.coslay.beans.autowire.Address" 
		parent="address"></bean>
		
	<bean id="address3" class="com.coslay.beans.autowire.Address" 
		p:street="DaZhongSi" parent="address2"></bean>
	
	<bean id="car" class="com.coslay.beans.autowire.Car"
		p:brand="Audi" p:price="300000"></bean>
	
	<!-- 
		要求在配置Person时。必须有一个关联的car！换句话说person这个bean依赖于Car这个bean
	 -->
	<bean id="person" class="com.coslay.beans.autowire.Person"
		p:name="Tom" p:address-ref="address2" depends-on="car"></bean>
	
</beans>