spring 自动装配  
  
一、spring 自动装配 default-autowire="byName"  
  
byName,按变量名称，与id名称一样，若不一样，就报错。  
  
<?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:aop="http://www.springframework.org/schema/aop"  
xmlns:tx="http://www.springframework.org/schema/tx"  
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd  
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd  
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"  
           default-autowire="byName">  
  
<bean id="bean1" class="com.zd.bean.Bean1" >  
<!-- 配了default-autowire="byName" ,可以注释  
    <property name="bean2">  
         <ref bean="bean2" />  
    </property>  
    <property name="bean3" ref="bean3" />  
    <property name="bean4">  
        <bean class="com.zd.bean.Bean4">  
            <property name="age" value="http://www.mamicode.com/16" />  
        </bean>  
    </property>  
-->  
</bean>  
  
二、spring 自动装配 default-autowire="byType"  
  
byType，按类型自动装配，若变量与id不匹配，也没关系  
  
<?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:aop="http://www.springframework.org/schema/aop"  
xmlns:tx="http://www.springframework.org/schema/tx"  
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd  
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd  
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"  
           default-autowire="byName">  
  
<bean id="bean1" class="com.zd.bean.Bean1" >  
<!-- 配了default-autowire="byType" ,可以注释  
    <property name="bean2">  
         <ref bean="bean2" />  
    </property>  
    <property name="bean3" ref="bean3" />  
    <property name="bean4">  
        <bean class="com.zd.bean.Bean4">  
            <property name="age" value="http://www.mamicode.com/16" />  
        </bean>  
    </property>  
-->  
</bean>  
  
三、默认配置是no，推荐用这种，因以上自动装配，对维护不是太好。  </pre><br>
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