Spring的配置总结

   
前段时间对Spring的事务配置做了比较深入的研究，在此之间对Spring的事务配置虽说也配置过，但是一直没有一个清楚的认识。通过这次的学习发觉Spring的事务配置只要把思路理清，还是比较好掌握的。

    总结如下：

   
Spring配置文件中关于事务配置总是由三个组成部分，分别是DataSource、TransactionManager和代理机制这三部分，无论哪种配置方式，一般变化的只是代理机制这部分。

   
DataSource、TransactionManager这两部分只是会根据数据访问方式有所变化，比如使用Hibernate进行数据访问时，DataSource实际为SessionFactory，TransactionManager的实现为HibernateTransactionManager。

    具体如下图：

    根据代理机制的不同，总结了五种Spring事务的配置方式，配置文件如下：

    第一种方式：每个Bean都有一个代理

xml version="1.0" encoding="UTF-8"?>
<beans
xmlns=""
    xmlns:xsi=""
    xmlns:context=""
    xmlns:aop=""
   
xsi:schemaLocation="

          
/spring-beans-2.5.xsd
          

          
/spring-context-2.5.xsd
          

/spring-aop-2.5.xsd">

    <bean
id="sessionFactory" 
            class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 

        <property name="configLocation" value="classpath:hibernate.cfg.xml" /> 

        <property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
   
bean> 


     

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
   
bean>
   

   
   
<bean id="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl">
        <property name="sessionFactory" ref="sessionFactory" />
   
bean>
   

    <bean id="userDao" 

        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> 

            

           <property name="transactionManager" ref="transactionManager" />    

        <property name="target"
ref="userDaoTarget" /> 

         <property name="proxyInterfaces" value="com.bluesky.spring.dao.GeneratorDao" />
         
        <property name="transactionAttributes"> 

            <props> 

                <prop key="*">PROPAGATION_REQUIREDprop>
            props> 

        property> 
   
bean> 

beans>

    第二种方式：所有Bean共享一个代理基类

xml version="1.0" encoding="UTF-8"?>
<beans
xmlns=""
    xmlns:xsi=""
    xmlns:context=""
    xmlns:aop=""
    xsi:schemaLocation="

          
/spring-beans-2.5.xsd
          

          
/spring-context-2.5.xsd
          

/spring-aop-2.5.xsd">

    <bean
id="sessionFactory" 
            class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 

        <property name="configLocation" value="classpath:hibernate.cfg.xml" /> 

        <property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
   
bean> 


     

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
   
bean>
   

    <bean id="transactionBase" 
            class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" 
            lazy-init="true"
abstract="true"> 

         

        <property name="transactionManager" ref="transactionManager" /> 

         

        <property name="transactionAttributes"> 

            <props> 

                <prop key="*">PROPAGATION_REQUIREDprop> 

            props> 

        property> 
   
bean>   

  
   
   
<bean id="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl">
        <property name="sessionFactory" ref="sessionFactory" />
   
bean>
   

    <bean id="userDao"
parent="transactionBase" > 

        <property name="target"
ref="userDaoTarget" />  

    bean>
beans>

第三种方式：使用拦截器

xml version="1.0" encoding="UTF-8"?>
<beans
xmlns=""
    xmlns:xsi=""
    xmlns:context=""
    xmlns:aop=""
   
xsi:schemaLocation="

          
/spring-beans-2.5.xsd
          

          
/spring-context-2.5.xsd
          

/spring-aop-2.5.xsd">

    <bean
id="sessionFactory" 
            class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 

        <property name="configLocation" value="classpath:hibernate.cfg.xml" /> 

        <property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
   
bean> 


     

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
   
bean>
  

    <bean id="transactionInterceptor" 
        class="org.springframework.transaction.interceptor.TransactionInterceptor"> 

        <property name="transactionManager" ref="transactionManager" /> 

         

        <property name="transactionAttributes"> 

            <props> 

                <prop key="*">PROPAGATION_REQUIREDprop> 

            props> 

        property> 
   
bean>
     

    <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator"> 

        <property name="beanNames"> 

            <list> 

                <value>*Daovalue>
           
list> 

        property> 

        <property name="interceptorNames"> 

            <list> 

                <value>transactionInterceptorvalue> 

            list> 

        property> 
   
bean> 
 

   
   
<bean id="userDao"
class="com.bluesky.spring.dao.UserDaoImpl">
        <property name="sessionFactory" ref="sessionFactory" />
   
bean>
beans>

第四种方式：使用tx标签配置的拦截器

xml version="1.0" encoding="UTF-8"?>
<beans
xmlns=""
    xmlns:xsi=""
    xmlns:context=""
    xmlns:aop=""
    xmlns:tx=""
    xsi:schemaLocation="

          
/spring-beans-2.5.xsd
          

          
/spring-context-2.5.xsd
          

/spring-aop-2.5.xsd
          

/spring-tx-2.5.xsd">

    <context:annotation-config />
   
<context:component-scan base-package="com.bluesky" />

    <bean
id="sessionFactory" 
            class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 

        <property name="configLocation" value="classpath:hibernate.cfg.xml" /> 

        <property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
   
bean> 


     

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
   
bean>

    <tx:advice id="txAdvice"
transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*"
propagation="REQUIRED" />
        tx:attributes>
   
tx:advice>
   

    <aop:config>
        <aop:pointcut id="interceptorPointCuts"
            expression="execution(*
com.bluesky.spring.dao.*.*(..))" />
        <aop:advisor advice-ref="txAdvice"
            pointcut-ref="interceptorPointCuts" />       

    aop:config>     

beans>

第五种方式：全注解

xml version="1.0" encoding="UTF-8"?>
<beans
xmlns=""
    xmlns:xsi=""
    xmlns:context=""
    xmlns:aop=""
    xmlns:tx=""
    xsi:schemaLocation="

          
/spring-beans-2.5.xsd
          

          
/spring-context-2.5.xsd
          

/spring-aop-2.5.xsd
          

/spring-tx-2.5.xsd">

    <context:annotation-config />
   
<context:component-scan base-package="com.bluesky" />

    <tx:annotation-driven transaction-manager="transactionManager"/>

    <bean
id="sessionFactory" 
            class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 

        <property name="configLocation" value="classpath:hibernate.cfg.xml" /> 

        <property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
   
bean> 


     

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
   
bean>
   

beans>

此时在DAO上需加上@Transactional注解，如下：

package com.bluesky.spring.dao;

import
java.util.List;

import
org.hibernate.SessionFactory;
import
org.springframework.beans.factory.annotation.Autowired;
import
org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import
org.springframework.stereotype.Component;

import
com.bluesky.spring.domain.User;

@Transactional
@Component("userDao")
public class
UserDaoImpl extends HibernateDaoSupport implements
UserDao {

    public List<User>
listUsers() {
        return this.getSession().createQuery("from
User").list();
    }
   
   
}