这个问题我真是百思不得其解啊！

<?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: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">

    <!--引入数据源-->
    <import resource="classpath:spring-dao.xml"/>
    <!--声明事务的管理类-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--配置dateSource-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--声明目标拦截对象-->
    <bean id="ordersServiceTarget" class="com.imooc.os.service.impl3.OrdersServiceImpl"></bean>
    <!--设置事务的拦截器-->
    <bean id="transactionInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor">
        <!--设置事务的管理类-->
        <property name="transactionManager" ref="transactionManager"/>
        <!--设置事务的属性-->
        <property name="transactionAttributes">
            <props>
                <prop key="*">PROPAGATION_REQUIRED</prop>
            </props>
        </property>
    </bean>
    <!--设置代理类工厂-->
    <bean id="ordersService" class="org.springframework.aop.framework.ProxyFactoryBean">
        <!--设置代理目标对象-->
        <property name="target" value="ordersServiceTarget"/>
        <!--设置拦截器-->
        <property name="interceptorNames">
            <list>
                <idref bean="transactionInterceptor"/>
            </list>
        </property>
    </bean>

</beans>