hibernate中配置了多个sessionFactory，怎么调用

Question

SSH2框架 在spring的配置文件ApplicationContext.xml里，配置了多个sessionFactory，代码里通过什么样的方式调用呢？
网上好多都是new ApplicationContext,然后测试。我不想用这样的测试类有实例代码最好(.java文件中的)
1. 不用显式的 new ApplicationContext的方式；
2. service层，DAO层调用的方式，针对每个请求取用数据源的变化，根据不同的SessionFactory名称，通过不同的方式切换取用SessionFactory。对hibernate不熟，大家帮忙看下 谢谢

Answer 1

<?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"    
    xmlns:aop="http://www.springframework.org/schema/aop"    
    xmlns:tx="http://www.springframework.org/schema/tx"    
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd    
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd    
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd    
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">  
  
    <description>springJTA</description>  
  
    <!--指定Spring配置中用到的属性文件    
    <bean id="propertyConfig"    
            class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">    
        <property name="locations">    
            <list>    
                <value>classpath:jdbc.properties</value>    
            </list>    
        </property>    
    </bean>       
    -->
    <!-- JOTM实例 -->  
    <bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean">  
          <property name="defaultTimeout" value="500000"/>  
    </bean>  
  
    <!-- JTA事务管理器 -->  
    <bean id="jtaTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">      
        <property name="userTransaction" ref="jotm" />      
    </bean>  
  
    <!-- 数据源A -->    
    <bean id="dataSourceA" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource" destroy-method="shutdown">    
       <property name="dataSource">    
           <bean class="org.enhydra.jdbc.standard.StandardXADataSource" destroy-method="shutdown">    
               <property name="transactionManager" ref="jotm"/>    
               <property name="driverName" value="com.mysql.jdbc.Driver"/>    
               <property name="url" value="jdbc:mysql://localhost:3306/emp_mvc"/>    
           </bean>    
       </property>    
       <property name="user" value="root"/>    
       <property name="password" value="123456"/>    
    </bean>    
  
    <!-- 数据源B -->    
    <bean id="dataSourceB" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource" destroy-method="shutdown">    
       <property name="dataSource">    
           <bean class="org.enhydra.jdbc.standard.StandardXADataSource" destroy-method="shutdown">    
               <property name="transactionManager" ref="jotm"/>    
               <property name="driverName" value="com.mysql.jdbc.Driver"/>    
               <property name="url" value="jdbc:mysql://localhost:3306/emp_mvc2"/>    
           </bean>    
       </property>    
       <property name="user" value="root"/>    
       <property name="password" value="123456"/>    
    </bean>    
 
    <bean id = "sessionFactoryA"    
        class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
         <property name = "dataSource" ref="dataSourceA"/>
         <property name="mappingResources">
 <list>
   <value>com/ouku/JOTM/entity/Emp.hbm.xml</value>
 </list>
 </property>    
    </bean>  
       
    <bean id = "sessionFactoryB"    
         class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">   
         <property name = "dataSource" ref="dataSourceB"/>
         <property name="mappingResources">
 <list>
   <value>com/ouku/JOTM/entity/Emp2.hbm.xml</value>
 </list>
 </property>    
    </bean>       
  
    <!-- 事务切面配置 -->    
    <aop:config>    
        <aop:pointcut id="pointCut"  
                expression="execution(* com.ouku.JOTM..*.*(..))"/><!-- 包及其子包下的所有方法 -->  
        <aop:advisor pointcut-ref="pointCut" advice-ref="txAdvice"/>    
          
        <aop:advisor pointcut="execution(* *..ouku.JOTM.*.*(..))" advice-ref="txAdvice"/>  
    </aop:config>    
  
    <!-- 通知配置 -->    
    <tx:advice id="txAdvice" transaction-manager="jtaTransactionManager">    
       <tx:attributes>    
          <tx:method name="delete*" rollback-for="Exception"/>    
          <tx:method name="save*" rollback-for="Exception"/>    
          <tx:method name="update*" rollback-for="Exception"/>    
          <tx:method name="find*" read-only="true" rollback-for="Exception"/>  
          <tx:method name="*" read-only="true" rollback-for="Exception"/>    
       </tx:attributes>    
    </tx:advice>    
  
    <bean id="genericDao"    
            class="com.ouku.JOTM.DAO.GenericDaoImpl" autowire="byName"> 
            <property name="sessionFactoryA" ref="sessionFactoryA"></property> 
            <property name="sessionFactoryB" ref="sessionFactoryB"></property> 
    </bean>  
  
    <bean id="userService"    
            class="com.ouku.JOTM.biz.UserServiceImpl" autowire="byName">  
    </bean>  
  
</beans>