Spring 自动装配
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一、自动装配方式
1.byName(属性),byType(属性),contructor(构造函数)
二、默认自动装配(多数装配都是用一样的装配方式,可以全局设定,少数自设定)
全局byType,MyBean使用constructor
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd" default-autowire="byType" > <!-- <bean id="myBean" class="com.lzp.mySpringMin.MyBean" autowire="byName"> </bean> <bean id="myBeanByName" class="com.lzp.mySpringMin.MyBeanByName"></bean> --> <bean id="myBean2" class="com.lzp.mySpringMin.MyBean" autowire="constructor"> </bean> <bean id="myBeanByContructor" class="com.lzp.mySpringMin.MyBeanByContructor"></bean>
三、混合自动装配
<bean id="myBeanByName" class="com.lzp.mySpringMin.MyBeanByName"></bean> <bean id="myBean2" class="com.lzp.mySpringMin.MyBean" autowire="constructor"> <property name="myBeanByName" ref="myBeanByName"></property> </bean> <bean id="myBeanByContructor" class="com.lzp.mySpringMin.MyBeanByContructor"></bean>
四、使用注解装配
<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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- <context:component-scan base-package="com.lzp.mySpringMin"> </context:component-scan> --> <context:annotation-config></context:annotation-config> <!-- <bean id="myBean" class="com.lzp.mySpringMin.MyBean" autowire="byName"> </bean> --> <bean id="myBeanByName" class="com.lzp.mySpringMin.MyBeanByName"></bean> <!-- <bean id="myBean2" class="com.lzp.mySpringMin.MyBean" autowire="constructor"> --> <bean id="myBean2" class="com.lzp.mySpringMin.MyBean" > <!-- <property name="myBeanByName" ref="myBeanByName"></property> --> </bean> <bean id="myBeanByContructor" class="com.lzp.mySpringMin.MyBeanByContructor"></bean> <bean id="aa" class="com.lzp.mySpringMin.MyImplatement"></bean> <bean id="bb" class="com.lzp.mySpringMin.MyImplatement2"></bean>
@Autowired @Qualifier("aa") private MyInterface myInterface;
当一种一个bean时,直接使用@Autowired即可,如果有多个bean为指定同一类型时,可以使用@Qualifier来确定其值。
注意xml的头配置
五、自动扫描
自动扫描在springmvc详细说明。