配置Spring，针对Service层的bean做事务处理

配置Spring，针对Service层的bean做事务处理，以往的做法是这样：

代码

1. <bean id="txProxyTemplate" abstract="true"    
2. class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">    
3.     <property name="transactionManager">  
4.         <ref bean="transactionManager"/>  
5.     </property>    
6.     <property name="transactionAttributes">    
7.         <props>  
8.             <prop key="find*">PROPAGATION_REQUIRED, readOnly</prop>    
9.             <prop key="*">PROPAGATION_REQUIRED</prop>    
10.         </props>    
11.     </property>    
12. </bean>    
13.   
14. <bean id="userManager" parent="txProxyTemplate">    
15.     <property name="target">    
16.         <bean class="some.package.UserManagerImpl">    
17.             <property name="userDAO"><ref bean="userDAO"/></property>    
18.         </bean>    
19.     </property>    
20. </bean>    
21.   

 

以后，如果增加新的Service/Manager，则XML配置的增量是这一段：

代码

1. <bean id="someOtherManager" parent="txProxyTemplate">    
2.     <property name="target">    
3.         <bean class="some.package.someOtherManagerImpl">    
4.         </bean>    
5.     </property>    
6. </bean>    

 

上面说的是老的做法，比较传统。缺点是增量比较大，配置起来copy&paste让人觉得不太爽，比较臃肿。

下面的是Feiing给出的更好的方案，我有一些修改：

 

代码

1. <beans>    
2.         <!-- Transaction manager for a single Hibernate SessionFactory (alternative to JTA) -->    
3.     <bean id="transactionManager"           class="org.springframework.orm.hibernate3.HibernateTransactionManager">    
4.           <property name="sessionFactory">    
5.               <ref bean="sessionFactory"/>    
6.           </property>    
7.     </bean>           
8.            
9.         <bean id="transactionInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor">    
10.             <property name="transactionManager" ref="transactionManager"/>    
11.             <property name="transactionAttributes">  
12.                 <props>  
13.                     <prop key="*">PROPAGATION_REQUIRED</prop>  
14.                     <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>  
15.                 </props>  
16.             </property>  
17.         </bean>    
18.            
19.         <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">    
20.                 <property name="beanNames">  
21.                     <value>*Service,*Manager</value>  
22.                 </property>  
23.                 <property name="interceptorNames">    
24.                         <list>    
25.                                 <value>transactionInterceptor</value>    
26.                                 <!--  
27.                                  此处增加新的Interceptor
28.                                  -->    
29.                         </list>    
30.                 </property>    
31.         </bean>    
32.   
33.         <bean class="org.springframework.transaction.interceptor.TransactionAttributeSourceAdvisor">    
34.           <property name="transactionInterceptor" ref="transactionInterceptor"/>    
35.         </bean>    
36.   
37.         <bean id="userManager" class="some.package.UserManagerImpl" autoWire="byName"/>  
38.                    
39. </beans>    

 

以后每次的增量是这一段：

代码

1. <bean id="userManager" class="some.package.UserManagerImpl" autoWire="byName"/>   

 

跟配置普通bean的方法一样，非常简洁、直观。对现有的Service接口也无须任何修改

我把Feiing的transactionAttributesSource改成叻transactionAttributes，并且将DefaultAdvisorAutoProxyCreator改成了BeanNameAutoProxyCreator，我觉得毕竟不是context下的每个bean都需要事务，只要在Service层做AOP就可以叻。