Java學習筆記(十)-Spring(三)

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Spring配置事務的五種方式

1.基於註解，DAO上需加上@Transactional註解

<tx:annotation-driven transaction-manager="transactionManager"/>

2.使用tx標籤配置的攔截器

<tx:advice id="txAdvice" transaction-manager="transactionManager"> 
    <tx:attributes> 
        <tx:method name="*" propagation="REQUIRED" /> 
    </tx:attributes> 
</tx:advice> 
 
<aop:config> 
    <aop:pointcut id="interceptorPointCuts"
        expression="execution(* com.bluesky.spring.dao.*.*(..))" /> 
    <aop:advisor advice-ref="txAdvice"
        pointcut-ref="interceptorPointCuts" />         
</aop:config>

3.使用攔截器

<bean id="transactionInterceptor"
       class="org.springframework.transaction.interceptor.TransactionInterceptor">   
       <property name="transactionManager" ref="transactionManager" />   
       <!-- 配置事務屬性 -->
       <property name="transactionAttributes">   
           <props>   
               <prop key="*">PROPAGATION_REQUIRED</prop>   
           </props>   
       </property>   
   </bean> 
 
   <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">   
       <property name="beanNames">   
           <list>   
               <value>*Dao</value> 
           </list>   
       </property>   
       <property name="interceptorNames">   
           <list>   
               <value>transactionInterceptor</value>   
           </list>   
       </property>   
   </bean>

4.所有Bean共享一個代理基類

<bean id="transactionBase"
        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
        lazy-init="true" abstract="true">   
    <!-- 配置事務管理器 -->
    <property name="transactionManager" ref="transactionManager" />   
    <!-- 配置事務屬性 -->
    <property name="transactionAttributes">   
        <props>   
            <prop key="*">PROPAGATION_REQUIRED</prop>   
        </props>   
    </property>   
</bean>
    <!-- 配置DAO -->
    <bean id="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl"> 
        <property name="sessionFactory" ref="sessionFactory" /> 
    </bean> 
 
    <bean id="userDao" parent="transactionBase" >   
        <property name="target" ref="userDaoTarget" />    
    </bean>

5.每個Bean都有一個代理

<bean id="userDao"
        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">   
           <!-- 配置事務管理器 -->
           <property name="transactionManager" ref="transactionManager" />      
        <property name="target" ref="userDaoTarget" />   
         <property name="proxyInterfaces" value="com.bluesky.spring.dao.GeneratorDao" /> 
        <!-- 配置事務屬性 -->
        <property name="transactionAttributes">   
            <props>   
                <prop key="*">PROPAGATION_REQUIRED</prop> 
            </props>   
        </property>   
    </bean>

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