装配Bean（三）

最新推荐文章于 2025-05-08 16:20:53 发布

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继承装配：

①继承

②继承配置

③覆盖父Bean配置

④可以设置<bean>的abstract属性为true, Spring不会实例化该Bean

public class Student

public class Gradate extends Student

例子：


package com.hsp.inherit;

public class Student {

	protected String name;
	protected int age;

	// *****************************
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}
}


package com.hsp.inherit;

public class Gradate extends Student {

	private String degree;
	
	
	//*******************************
	public String getDegree() {
		return degree;
	}

	public void setDegree(String degree) {
		this.degree = degree;
	}
	
}


<?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:context="http://www.springframework.org/schema/context"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
				http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

	<!-- 配置一个学生对象 -->
	<bean id="student" class="com.hsp.inherit.Student">
		<property name="name" value="顺平" />
		<property name="age" value="30" />
	</bean>
	<!-- 配置Grdate对象 -->
	<bean id="grdate" parent="student" class="com.hsp.inherit.Gradate">
		<!-- 如果自己配置属性name,age,则会替换从父对象继承的数据 -->
		<property name="name" value="小明" />
		<property name="degree" value="学士" />
	</bean>

</beans>


package com.hsp.inherit;

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

public class App1 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ApplicationContext ac=new ClassPathXmlApplicationContext("com/hsp/inherit/beans.xml");
	
		Gradate gradate=(Gradate) ac.getBean("grdate");
		System.out.println(gradate.getName()+" "+gradate.getAge()+" "+gradate.getDegree());
	}

}