spring配置bean的细节二

一 内部bean
<bean id="foo" class="....Foo">
    <property name=”属性”>
    <!—第一方法引用-->
    <ref bean='bean对象名'/>
    <!—内部bean-->
    <bean>
    <properyt></property>
</bean>
</property>
</bean>
这种方式的缺点是你无法在其它地方重用这个bar实例，原因是它是专门为foo而用。

二 继承配置
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

三 代码
1 Student

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;
}
}

2 Gradate

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;
}

}

3 beans.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:context="http://www.springframework.org/schema/context";
xmlns:tx="http://www.springframework.org/schema/tx";
xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/txhttp://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>

4 App1

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());
}
}

四 测试结果
小明 30 学士