Spring+Hibernate框架上Mysql读写分离、主从数据库配置无法选择数据源

<?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:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.springframework.org/schema/tx 
                        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
            http://www.springframework.org/schema/aop
                        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
                        http://www.springframework.org/schema/context  
                http://www.springframework.org/schema/context/spring-context-3.0.xsd">
    <context:annotation-config />  
    
    <!-- 自动加载SERVICE DAO ACTION -->  
    <context:component-scan base-package="com.test.dao.*" />  
    <context:component-scan base-package="com.test.service.*" />  
    
    <!-- 加载properties配置文件 -->  
    <bean id="propertyConfigurer"  
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">  
        <property name="locations">  
            <list>  
                <value>classpath:log4j.properties</value>  
                <value>classpath:jdbc.properties</value>  
            </list>  
        </property>  
    </bean>  
  
    <bean id="parentDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">  
        <property name="initialPoolSize"><value>30</value></property>
        <property name="minPoolSize"><value>10</value></property>
        <property name="maxPoolSize"><value>50</value></property>
    </bean>  
     <!-- 主数据源-->  
    <bean id="masterDataSource" parent="parentDataSource">  
        <property name="driverClass" value="com.mysql.jdbc.Driver" />  
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test" />  
        <property name="user" value="root" />  
        <property name="password" value="" />  
    </bean>
          
    <!-- 从数据源-->  
    <bean id="slaveDataSource" parent="parentDataSource">  
        <property name="driverClass" value="com.mysql.jdbc.Driver" />  
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3307/test" />  
        <property name="user" value="root" />  
        <property name="password" value="" /> 
    </bean>  
  
    <bean id="dataSource" class="com.test.datasource.DynamicDataSource">  
        <property name="targetDataSources">  
            <map key-type="java.lang.String">  
                <entry key="slave" value-ref="slaveDataSource" />
                <entry key="master" value-ref="masterDataSource" />  
            </map>  
        </property>  
        <property name="defaultTargetDataSource" ref="masterDataSource" />  
    </bean>  
  
    <!-- 配置sessionFactory -->  
    <bean id="sessionFactory"  
        class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">  
        <property name="dataSource"><ref local="dataSource"/></property> 
        <property name="packagesToScan" value="com.test.bean" /> 
        <property name="configLocation" value="classpath:hibernate.cfg.xml">
        </property>
        <property name="hibernateProperties">  
            <props>  
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> 
                <prop key="hibernate.show_sql">true</prop> 
                <prop key="hibernate.format_sql">true</prop> 
            </props>  
        </property>  
    </bean>  
      
    <!-- 切换数据源 -->  
    <bean id="dataSourceAdvice" class="com.test.datasource.aop.DataSourceAdvice"></bean>
      
    <aop:config>  
        <aop:pointcut id="businessService" expression="execution(* com.test.service..*.*(..))" />
        <aop:advisor  pointcut-ref="businessService" advice-ref="dataSourceAdvice" />
    </aop:config>  
    
    <!-- 配置事务管理器 -->  
    <bean id="transactionManager"  
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">  
        <property name="sessionFactory">  
            <ref bean="sessionFactory" />  
        </property>  
    </bean>  
    
    <!--配置事务的传播特性 -->  
    <tx:advice id="txAdvice" transaction-manager="transactionManager">  
        <tx:attributes>  
            <!-- 对增、删、改方法进行事务支持 -->  
            <tx:method name="add*" propagation="REQUIRED" />  
            <tx:method name="create*" propagation="REQUIRED" />  
            <tx:method name="save*" propagation="REQUIRED" />  
            <tx:method name="edit*" propagation="REQUIRED" />  
            <tx:method name="update*" propagation="REQUIRED" />  
            <tx:method name="delete*" propagation="REQUIRED" />  
            <tx:method name="remove*" propagation="REQUIRED" />  
            <!-- 对查找方法进行只读事务 -->  
            <tx:method name="loadByUsername*" propagation="SUPPORTS" read-only="true" />  
            <!-- 对其它方法进行只读事务 -->  
            <tx:method name="*" propagation="SUPPORTS" read-only="true" />  
        </tx:attributes>  
    </tx:advice>  
    
    <!--那些类的哪些方法参与事务 -->  
    <aop:config>  
        <aop:advisor  
            pointcut="execution(* com.test.service..*.*(..))"  
            advice-ref="txAdvice" />  
    </aop:config> 
    
    <!-- 配置DAO -->
    <bean id="personDAO" class="com.test.dao.impl.PersonDAOImpl">
        <property name="sessionFactory">
            <ref local="sessionFactory"></ref>
        </property>
    </bean>
    
    <!-- 配置service -->
    <bean id="personService" class="com.test.service.impl.PersonServiceImpl">
        <property name="personDAO">
            <ref bean="personDAO"></ref>
        </property>
    </bean>
</beans>