spring 自动装配

spring自动装配分两种,按名字:byName,按类型:byType





<?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-2.0.xsd"
default-autowire="byName/byType">

<bean id="abstractBean" abstract="true">
<property name="id" value="123"></property>
<property name="name" value="John"></property>
</bean>
<!--
<bean id="bean2" class="testBean.Bean2">
<property name="bean3" ref="bean3"/>
<property name="bean4" ref="bean4"/>
</bean>
-->
<bean id="bean2" class="testBean.Bean2"/>
<bean id="bean3" class="testBean.Bean3" parent="abstractBean">
<property name="name" value="Jim"></property>
<property name="password" value="aab"></property>
</bean>

<bean id="bean4" class="testBean.Bean4" parent="abstractBean"></bean>
</beans>

==================================Bean2.java===================

public class Bean2 {

private Bean3 bean3;//按名字装载,spring会根据配置文件中的id查找实例

private Bean4 bean4;//按类型.spring会根据类型查找实例

public Bean3 getBean3() {
return bean3;
}

public void setBean3(Bean3 bean3) {
this.bean3 = bean3;
}

public Bean4 getBean4() {
return bean4;
}

public void setBean4(Bean4 bean4) {
this.bean4 = bean4;
}


}

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