Spring自动装配@Qualifier实例

自动装配示例

自动装配“person” bean 到 customer 的 person 属性
package com.yiibai.common;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
public class Customer {
    @Autowired
    private Person person;
    //...
}

xml

<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">
<bean 
class ="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"/>
    <bean id="customer" class="com.yiibai.common.Customer" />
    <bean id="personA" class="com.yiibai.common.Person" >
        <property name="name" value="yiibaiA" />
    </bean>
    <bean id="personB" class="com.yiibai.common.Person" >
        <property name="name" value="yiibaiB" />
    </bean>
</beans>

异常

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: 
    No unique bean of type [com.yiibai.common.Person] is defined: 
        expected single matching bean but found 2: [personA, personB]

@Qualifier示例

package com.yiibai.common;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
public class Customer {
    @Autowired
    @Qualifier("personA")
    private Person person;
    //...
}