Spring配置事务在Dao层和Service层

【转载自http://www.blogjava.net/hk2000c/archive/2007/11/01/157508.html】

【感谢原作者：hk2000c】

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


<!—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


<!—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。