Spring configuration transactions at the DAO Layer and service layer

"Reprinted from Http://www.blogjava.net/hk2000c/archive/2007/11/01/157508.html"
"Thank the original author: hk2000c"
Spring implements declarative transaction management through AOP. The spring transaction agent is typically set up through Transactionproxyfactorybean. We need a target object wrapped in the transaction agent. This target object is typically a bean of a normal Java object. When we define Transactionproxyfactorybean, we must provide an associated Platformtransactionmanager reference and transaction attributes. The transaction attribute contains the transaction definition described above.
Platformtransactionmanager:
Hibernatetransactionmanager needs a sessionfactory reference.
Jtatransactionmanager
A To place a transaction on the DAO Layer:
Java code    <!-hibernateTransactionManager-->   <bean id= "TransactionManager"           class= " Org.springframework.orm.hibernate3.HibernateTransactionManager ">           <property name= "Sessionfactory" >                  <ref local= "Sessionfactory"  />           </property>   </bean>   <!-dao Layer Interface Implementation-->    <bean id= "Companydaotarget"           class= " Com.vstsoft.querycompany.dao.impl.CompanyDAOImpl ">           <property name= "Sessionfactory" >                  <ref local= "SessionfactoRy " />          </property>   </bean>    <!-spring to the DAO layer's transaction Agent-->   <bean id= "Companydaoproxy"            class= "Org.springframework.transaction.interceptor.TransactionProxyFactoryBean" >          <property name= "TransactionManager" >                  <ref  Bean= "TransactionManager"  />          </property>           <property name= "target" >                  <ref local= " Companydaotarget " />          </property>    &NBSP;&NBSP;&NBSP;&NBSP;   <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>   <!-Business layer Interface implementation, Inject DAO into service-->   <bean name= "Companymanagetarget"            class= "Com.vstsoft.querycompany.service.impl.CompanyManageTarget" >           <property name= "Companydao" >                  <ref bean= "CompanyDAOProxy"  / >          </property>   </bean>    <!-spring to service layer agent-->   <bean id= "Companymanageproxy"            class= "Org.springframework.aop.framework.ProxyFactoryBean" >           <property name= "Proxyinterfaces" >           &nBsp;      <value>com.vstsoft.querycompany.service.companymanage</value >          </property>           <property name= "Target" >                  <ref bean= "Companymanagetarget"  />          </property>   </bean>   <!- Configure struts access, inject the service layer into the action-->   <bean name= "/company"            class= "Com.vstsoft.querycompany.web.action.CompanyAction"  singleton= "false" >           <property name= "Companymanage" >                 <ref local= " Companymanageproxy " />          </property>   </bean>  

Two The transaction is placed at the service level:
Java code    <!-jtaTransactionManager-->   <bean id= "Jtatransactionmanager"            class= " Org.springframework.transaction.jta.JtaTransactionManager " />   <!-dao layer Interface Implementation-->    <bean id= "Companydaotarget"           class= " Com.vstsoft.querycompany.dao.impl.CompanyDAOImpl ">           <property name= "Sessionfactory" >                  <ref local= "Sessionfactory"  />           </property>   </bean>   <!-spring proxy-->  for DAO layer   <bean id= "Companydaoproxy"           class= " Org.springframework.aop.framework.ProxyFactoryBean ">          <property name= "Proxyinterfaces" >                  <value> com.vstsoft.querycompany.dao.companydao</value>