Spring--IoC_值注入

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一：Spring IoC设值注入：指通过setter方法传入被调用者的实例。这种注入方式简单、直观，因而在Spring的依赖注入里大量使用。

其xml配置文件：

applicationContext.xml:

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"        "http://www.springframework.org/dtd/spring-beans-2.0.dtd"><beans>  <bean id ="carBuyer" class = "com.dw.interf.impl.ICarBuyer">    <property name="car">    <!-- 将另外一个bean的引用注入给carBuyer bean -->      <ref bean="honda"/>    </property>  </bean>    <bean id = "honda" class = "com.dw.interf.impl.IHondaCar"/>  <bean id = "bm" class = "com.dw.interf.impl.IBmCar"/>  <bean id = "houseBuyer" class = "com.dw.interf.impl.IHouseBuyer"/></beans>

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二、Spring IoC构造注入：通过构造函数来完成依赖关系的设定，而不是通过setter方法。

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"        "http://www.springframework.org/dtd/spring-beans-2.0.dtd"><beans>  <bean id ="carBuyer" class = "com.dw.interf.impl.ICarBuyer">    <constructor-arg>      <ref bean="honda"/>    </constructor-arg>  </bean>    <bean id = "honda" class = "com.dw.interf.impl.IHondaCar"/>  <bean id = "bm" class = "com.dw.interf.impl.IBmCar"/>  <bean id = "houseBuyer" class = "com.dw.interf.impl.IHouseBuyer"/></beans>

实体类中需要定义相应的构造函数

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