spring声明式事务管理的两种方式

传统的：

1 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
 2         <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
 3         <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:dev" />
 4         <property name="username" value="kaktos" />
 5         <property name="password" value="kaktos" />
 6     </bean>
 7 
 8     <bean id="txManager"
 9         class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
10         <property name="dataSource" ref="dataSource" />
11     </bean>
12 
13     <bean id="businessBean"
14         class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
15         <property name="transactionManager" ref="txManager" />
16         <property name="target" ref="businessBeanTarget" />
17         <property name="transactionAttributes">
18             <props>                
19                 <prop key="*">PROPAGATION_REQUIRED</prop>
20             </props>
21         </property>
22     </bean>
23     
24     <bean id="businessBeanTarget" class="sample.spring.trans.BusinessBean">
25         <property name="dataSource" ref="dataSource" />
24    </bean>

这样做的弊端就是不得不为每个需要事务的bean做一次声明，如果所有的bean都基本上有一致的配置，这样就太繁琐啦。
下面是第二种方式：

 1 <beans>
 2     <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
 3         <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
 4         <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:dev" />
 5         <property name="username" value="kaktos" />
 6         <property name="password" value="kaktos" />
 7     </bean>
 8 
 9     <bean id="txManager"
10         class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
11         <property name="dataSource" ref="dataSource" />
12     </bean>
13 
14     <bean id="matchAllWithPropReq"
15         class="org.springframework.transaction.interceptor.MatchAlwaysTransactionAttributeSource">
16         <property name="transactionAttribute" value="PROPAGATION_REQUIRED" />
17     </bean>
18     
19     <bean id="matchAllTxInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor">
20         <property name="transactionManager" ref="txManager" />
21         <property name="transactionAttributeSource" ref="matchAllWithPropReq" />
22     </bean>
23 
24     <bean id="autoProxyCreator"
25         class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
26         <property name="interceptorNames">
27             <list>
28                 <idref local="matchAllTxInterceptor" />
29             </list>
30         </property>
31         <property name="beanNames">
32             <list>
33                 <idref local="businessBean" />
34             </list>
35         </property>
36     </bean>
37     
38     <!--  my beans  -->
39     <bean id="businessBean" class="sample.spring.trans.BusinessBean">
40         <property name="dataSource" ref="dataSource" />
41     </bean>
42 </beans>

BeanNameAutoProxyCreator会在applicationcontext初始化后自动为beanNames属性中的bean建立proxy。