ioc的实现

<?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.xsd">
<!-- bean就是java对象，由spring容器来创建和管理 -->
<bean id="mysqlDao" class="com.yikuan.cn.Impl.UserDaoMysqlImplement"/>
<bean id="oracleDao" class="com.yikuan.cn.Impl.UserDaoOracleImplement"/>
<bean id="service" class="com.yikuan.cn.serviceImpl.UserServiceImplement">
<property name="userDao" ref="mysqlDao"></property>
<!-- ref是引用对象，对象是由spring来创建的 -->
</bean>

</beans>