学步园

Spring通过AOP实现声明式事务管理。通常通过TransactionProxyFactoryBean设置Spring事务代理。我们需要一个目标对象包装在事务代理中。这个目标对象一般是一个普通Java对象的bean。当我们定义TransactionProxyFactoryBean时，必须提供一个相关的 PlatformTransactionManager的引用和事务属性。 事务属性含有上面描述的事务定义。
PlatformTransactionManager：
HibernateTransactionManager需要一个SessionFactory的引用
JtaTransactionManager
一．把事务放置在了DAO层：

Java代码  

1. <!—hibernateTransactionManager-->   
2. <bean id="transactionManager"  
3.        class="org.springframework.orm.hibernate3.HibernateTransactionManager">   
4.        <property name="sessionFactory">   
5.               <ref local="sessionFactory" />   
6.        </property>   
7. </bean>   
8. <!—DAO层接口实现-->   
9. <bean id="companyDAOTarget"  
10.        class="com.vstsoft.querycompany.dao.impl.CompanyDAOImpl">   
11.        <property name="sessionFactory">   
12.               <ref local="sessionFactory" />   
13.        </property>   
14. </bean>   
15. <!—spring对DAO层的事务代理-->   
16. <bean id="companyDAOProxy"  
17.        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">   
18.        <property name="transactionManager">   
19.               <ref bean="transactionManager" />   
20.        </property>   
21.        <property name="target">   
22.               <ref local="companyDAOTarget" />   
23.        </property>   
24.        <property name="transactionAttributes">   
25.               <props>   
26.               <prop key="insert*">PROPAGATION_REQUIRED</prop>   
27.               <prop key="delete*">PROPAGATION_REQUIRED</prop>   
28.               <prop key="find*">   
29.               PROPAGATION_REQUIRED,readOnly   
30.               </prop>   
31.               </props>   
32.        </property>   
33. </bean>   
34. <!—业务层接口实现，把DAO注入到Service里面-->   
35. <bean name="companyManageTarget"  
36.        class="com.vstsoft.querycompany.service.impl.CompanyManageTarget">   
37.        <property name="companyDAO">   
38.               <ref bean="companyDAOProxy" />   
39.        </property>   
40. </bean>   
41. <!—spring对Service层的代理-->   
42. <bean id="companyManageProxy"  
43.        class="org.springframework.aop.framework.ProxyFactoryBean">   
44.        <property name="proxyInterfaces">   
45.               <value>com.vstsoft.querycompany.service.CompanyManage</value>   
46.        </property>   
47.        <property name="target">   
48.               <ref bean="companyManageTarget" />   
49.        </property>   
50. </bean>   
51. <!—配置struts访问，把service层注入到action里面-->   
52. <bean name="/company"  
53.        class="com.vstsoft.querycompany.web.action.CompanyAction" singleton="false">   
54.        <property name="companyManage">   
55.               <ref local="companyManageProxy" />   
56.        </property>   
57. </bean>  

<!—hibernateTransactionManager-->
<bean id="transactionManager"
       class="org.springframework.orm.hibernate3.HibernateTransactionManager">
       <property name="sessionFactory">
              <ref local="sessionFactory" />
       </property>
</bean>
<!—DAO层接口实现-->
<bean id="companyDAOTarget"
       class="com.vstsoft.querycompany.dao.impl.CompanyDAOImpl">
       <property name="sessionFactory">
              <ref local="sessionFactory" />
       </property>
</bean>
<!—spring对DAO层的事务代理-->
<bean id="companyDAOProxy"
       class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
       <property name="transactionManager">
              <ref bean="transactionManager" />
       </property>
       <property name="target">
              <ref local="companyDAOTarget" />
       </property>
       <property name="transactionAttributes">
              <props>
              <prop key="insert*">PROPAGATION_REQUIRED</prop>
              <prop key="delete*">PROPAGATION_REQUIRED</prop>
              <prop key="find*">
              PROPAGATION_REQUIRED,readOnly
              </prop>
              </props>
       </property>
</bean>
<!—业务层接口实现，把DAO注入到Service里面-->
<bean name="companyManageTarget"
       class="com.vstsoft.querycompany.service.impl.CompanyManageTarget">
       <property name="companyDAO">
              <ref bean="companyDAOProxy" />
       </property>
</bean>
<!—spring对Service层的代理-->
<bean id="companyManageProxy"
       class="org.springframework.aop.framework.ProxyFactoryBean">
       <property name="proxyInterfaces">
              <value>com.vstsoft.querycompany.service.CompanyManage</value>
       </property>
       <property name="target">
              <ref bean="companyManageTarget" />
       </property>
</bean>
<!—配置struts访问，把service层注入到action里面-->
<bean name="/company"
       class="com.vstsoft.querycompany.web.action.CompanyAction" singleton="false">
       <property name="companyManage">
              <ref local="companyManageProxy" />
       </property>
</bean>

二．把事务放置在了Service层：

Java代码  

1. <!—jtaTransactionManager-->   
2. <bean id="jtaTransactionManager"  
3.        class="org.springframework.transaction.jta.JtaTransactionManager" />   
4. <!—DAO层接口实现-->   
5. <bean id="companyDAOTarget"  
6.        class="com.vstsoft.querycompany.dao.impl.CompanyDAOImpl">   
7.        <property name="sessionFactory">   
8.               <ref local="sessionFactory" />   
9.        </property>   
10. </bean>   
11. <!—spring对DAO层的代理-->   
12. <bean id="companyDAOProxy"  
13.        class="org.springframework.aop.framework.ProxyFactoryBean">   
14.        <property name="proxyInterfaces">   
15.               <value>com.vstsoft.querycompany.dao.CompanyDAO</value>   
16.        </property>   
17.        <property name="target">   
18.               <ref bean="companyDAOTarget" />   
19.        </property>   
20. </bean>   
21. <!—业务层接口实现，把DAO注入到Service里面-->   
22. <bean name="companyManageTarget"  
23.        class="com.vstsoft.querycompany.service.impl.CompanyManageTarget">   
24.        <property name="companyDAO">   
25.               <ref bean="companyDAOProxy" />   
26.        </property>   
27. </bean>   
28. <!—spring代理业务层的事务管理-->   
29. <bean id="companyManageProxy"  
30.        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">   
31.        <property name="transactionManager">   
32.               <ref local="jtaTransactionManager" />   
33.        </property>   
34.        <property name="transactionAttributes">   
35.               <props>   
36.                      <prop key="set*">PROPAGATION_REQUIRED</prop>   
37.                      <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>   
38.               </props>   
39.        </property>   
40.        <property name="target">   
41.               <ref bean="companyManageTarget" />   
42.        </property>   
43. </bean>   
44. <!—配置struts访问，把service层注入到action里面-->   
45. <bean name="/company"  
46.        class="com.vstsoft.querycompany.web.action.CompanyAction" singleton="false">   
47.        <property name="companyManage">   
48.               <ref local="companyManageProxy" />   
49.        </property>   
50. </bean>  

<!—jtaTransactionManager-->
<bean id="jtaTransactionManager"
       class="org.springframework.transaction.jta.JtaTransactionManager" />
<!—DAO层接口实现-->
<bean id="companyDAOTarget"
       class="com.vstsoft.querycompany.dao.impl.CompanyDAOImpl">
       <property name="sessionFactory">
              <ref local="sessionFactory" />
       </property>
</bean>
<!—spring对DAO层的代理-->
<bean id="companyDAOProxy"
       class="org.springframework.aop.framework.ProxyFactoryBean">
       <property name="proxyInterfaces">
              <value>com.vstsoft.querycompany.dao.CompanyDAO</value>
       </property>
       <property name="target">
              <ref bean="companyDAOTarget" />
       </property>
</bean>
<!—业务层接口实现，把DAO注入到Service里面-->
<bean name="companyManageTarget"
       class="com.vstsoft.querycompany.service.impl.CompanyManageTarget">
       <property name="companyDAO">
              <ref bean="companyDAOProxy" />
       </property>
</bean>
<!—spring代理业务层的事务管理-->
<bean id="companyManageProxy"
       class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
       <property name="transactionManager">
              <ref local="jtaTransactionManager" />
       </property>
       <property name="transactionAttributes">
              <props>
                     <prop key="set*">PROPAGATION_REQUIRED</prop>
                     <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
              </props>
       </property>
       <property name="target">
              <ref bean="companyManageTarget" />
       </property>
</bean>
<!—配置struts访问，把service层注入到action里面-->
<bean name="/company"
       class="com.vstsoft.querycompany.web.action.CompanyAction" singleton="false">
       <property name="companyManage">
              <ref local="companyManageProxy" />
       </property>
</bean>

例如：在service层的接口实现CompanyManageImpl里面有个setData方法：按顺序执行对数据库的数据查询，数据删除，数据插入数据库，如果哪一步出异常（运行时异常），以上三个操作都将事务回滚。