• Spring 事务配置的五种方式


    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事务类型详解:
      PROPAGATION_REQUIRED--支持当前事务,如果当前没有事务,就新建一个事务。这是最常见的选择。
      PROPAGATION_SUPPORTS--支持当前事务,如果当前没有事务,就以非事务方式执行。
      PROPAGATION_MANDATORY--支持当前事务,如果当前没有事务,就抛出异常。
      PROPAGATION_REQUIRES_NEW--新建事务,如果当前存在事务,把当前事务挂起。
      PROPAGATION_NOT_SUPPORTED--以非事务方式执行操作,如果当前存在事务,就把当前事务挂起。
      PROPAGATION_NEVER--以非事务方式执行,如果当前存在事务,则抛出异常。
      PROPAGATION_NESTED--如果当前存在事务,则在嵌套事务内执行。如果当前没有事务,则进行与PROPAGATION_REQUIRED类似的操作。

        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:

    Spring事务配置 (2)

        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:

    其中

    <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> 

    可以用下面的替换

    <!-- 配置数据源,使用的是alibaba的Druid(德鲁伊)数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}" />  
        <property name="url" value="${jdbc.url}" />  
        <property name="username" value="${jdbc.username}" />  
        <property name="password" value="${jdbc.password}" /> 
        <!-- 初始化连接大小 -->  
        <property name="initialSize" value="${jdbc.initialSize}"></property>  
        <!-- 连接池最大数量 -->  
        <property name="maxActive" value="${jdbc.maxActive}"></property>  
        <!-- 连接池最小空闲 -->  
        <property name="minIdle" value="${jdbc.minIdle}"></property>  
        <!-- 连接池最大空闲 -->  
        <property name="maxIdle" value="${jdbc.maxIdle}"></property>  
        <!-- 获取连接最大等待时间 -->  
        <property name="maxWait" value="${jdbc.maxWait}"></property>  
    </bean>

        第一种方式:每个Bean都有一个代理

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
               http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
               http://www.springframework.org/schema/context
               http://www.springframework.org/schema/context/spring-context-2.5.xsd
               http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/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>  
    
        <!-- 定义事务管理器(声明式的事务) -->  
        <bean id="transactionManager"
            class="org.springframework.orm.hibernate3.HibernateTransactionManager">
            <property name="sessionFactory" ref="sessionFactory" />
        </bean>
        
        <!-- 配置DAO -->
        <bean id="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl">
            <property name="sessionFactory" ref="sessionFactory" />
        </bean>
        
        <bean id="userDao"  
            class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">  
               <!-- 配置事务管理器 -->  
               <property name="transactionManager" ref="transactionManager" />     
            <property name="target" ref="userDaoTarget" />  
             <property name="proxyInterfaces" value="com.bluesky.spring.dao.GeneratorDao" />
            <!-- 配置事务属性 -->  
            <property name="transactionAttributes">  
                <props>  
                    <prop key="*">PROPAGATION_REQUIRED</prop>
                </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="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
               http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
               http://www.springframework.org/schema/context
               http://www.springframework.org/schema/context/spring-context-2.5.xsd
               http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/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>  
    
        <!-- 定义事务管理器(声明式的事务) -->  
        <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">  
            <!-- 配置事务管理器 -->  
            <property name="transactionManager" ref="transactionManager" />  
            <!-- 配置事务属性 -->  
            <property name="transactionAttributes">  
                <props>  
                    <prop key="*">PROPAGATION_REQUIRED</prop>  
                </props>  
            </property>  
        </bean>    
       
        <!-- 配置DAO -->
        <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="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
               http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
               http://www.springframework.org/schema/context
               http://www.springframework.org/schema/context/spring-context-2.5.xsd
               http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/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>  
    
        <!-- 定义事务管理器(声明式的事务) -->  
        <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" />  
            <!-- 配置事务属性 -->  
            <property name="transactionAttributes">  
                <props>  
                    <prop key="*">PROPAGATION_REQUIRED</prop>  
                </props>  
            </property>  
        </bean>
          
        <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">  
            <property name="beanNames">  
                <list>  
                    <value>*Dao</value>
                </list>  
            </property>  
            <property name="interceptorNames">  
                <list>  
                    <value>transactionInterceptor</value>  
                </list>  
            </property>  
        </bean>  
      
        <!-- 配置DAO -->
        <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 -- 声明式事务

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
               http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
               http://www.springframework.org/schema/context
               http://www.springframework.org/schema/context/spring-context-2.5.xsd
               http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
               http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/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>  
    
        <!-- 定义事务管理器(声明式的事务) -->  
        <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="delete*" propagation="REQUIRED" /> 
    <tx:method name="save*" propagation="REQUIRED" />
    <tx:method name="update*" propagation="REQUIRED" />
    <tx:method name="*" propagation="SUPPORTS" read-only="true"/> </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="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
               http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
               http://www.springframework.org/schema/context
               http://www.springframework.org/schema/context/spring-context-2.5.xsd
               http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
               http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/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>  
    
        <!-- 定义事务管理器(声明式的事务) -->  
        <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();
        }
        
        
    }
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  • 原文地址:https://www.cnblogs.com/jtlgb/p/9882772.html
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