SpringDI_容器的继承

Person

package com.spring.extend;

public class Person {

    private String name;

    public String getName() {
        return name;
    }

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

}

student

package com.spring.extend;

public class Student extends Person {

}

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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

    <!--在父类中进行赋值，子类通过 parent属性继承父类的内容 -->
    <bean id="person" class="com.spring.extend.Person">
        <property name="name" value="aaa"></property>
    </bean>

    <!--
        parent  实现了Spring容器内部的继承关系
     -->

    <bean id="student" class="com.spring.extend.Student" parent="person"></bean>    

    <!--
        因为java的继承机制，子类继承的父类的setXX方法，左右子类可以利用setXXX方法注入值
     -->
    <bean id="person2" class="com.spring.extend.Person"></bean>

     <bean id="student2" class="com.spring.extend.Student">
         <property name="name" value="bbb"></property>
     </bean>    

</beans>

测试

package com.spring.extend.test;

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

import com.spring.extend.Student;

public class ExtendsTest {

    @Test
    public void testDI_XML_constructor(){

        ApplicationContext context=
                new ClassPathXmlApplicationContext("applicationContext.xml");

//        Student student=(Student) context.getBean("student");
//
//        System.out.println(student.getName());  //aaa

//        Student student=(Student) context.getBean("student2");
//
//        System.out.println(student.getName());  //bbb
    }

}