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补充知识点: 事务的传播特性:在当前的执行环境中。如果有多个方法嵌套互相调用的话,那么事务的特性必将从第一个方法传播到第二个、第三个。。。。 ~~~ /*事务的传播性。如果当前执行环境中有事务,那么则会一直在 * 传播环境中传播下去。如果没有事务那么则会创建一个事务 * 默认就是required * 而readOnly属性则是规定该事务只能是一些select操作。而insert,update等 * 动作是不能执行的。因为readonly的限制,而且拿到readonly=true的transation * 的话它的执行效率是比前者高的 * 还有更多事务配置请在: *http://static.springsource.org/spring/docs/2.5.6/reference/transaction.html#transaction-strategies * 9.5.6.1. @Transactionalsettings 中查看 */ @Transactional(propagation=Propagation.REQUIRED,readOnly=true) public void save(User u){ u.setName("zhanglong"); UserLog log = new UserLog(); log.setMsg("useradded"); userDaoImpl.save(u); userLogDaoImpl.save(log); } ~~~ 下面看一个xml配置事务的案例: 1、 编写业务逻辑操作的简单方法: ~~~ @Component("userService") public class UserServiceImpl implements UserService{ @Resource private UserDao userDaoImpl; @Resource private UserLogDao userLogDaoImpl; public UserLogDao getUserLogDaoImpl() { return userLogDaoImpl; } public void setUserLogDaoImpl(UserLogDao userLogDaoImpl) { this.userLogDaoImpl = userLogDaoImpl; } public UserDao getUserDaoImpl() { return userDaoImpl; } public void setUserDaoImpl(UserDao userDaoImpl) { this.userDaoImpl = userDaoImpl; } public void save(User u){ u.setName("zhanglong"); UserLog log = new UserLog(); log.setMsg("user added"); userDaoImpl.save(u); userLogDaoImpl.save(log); } } ~~~ 2、  编写XML配置文件,将事务加上去: 下面的文件主要包括配置数据库和指定事务前一段不用看。我们主要看事务在xml中的配置 1、  配置事务管理器transactionManager 2、 配置事务要管理的方法tx:advice 3、 配置AOP将逻辑事务织入到相应的方法上去 ~~~ <?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/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <context:annotation-config /> <!-- 配置容器资源扫描的包 --> <context:component-scan base-package="com.spring" /> <!-- 将前面类写入容器 --> <bean id="logInterceptor" class="com.spring.aop.LogInterceptor" /> <!-- 配置数据源 <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/sms"/> <property name="username" value="root"/> <property name="password" value="root"/> </bean> --> <!-- placeholder 占位符 --> <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <value>classpath:jdbc.properties</value> </property> </bean> <!-- 配置dataSource --> <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> <!-- 将配置好的dataSource注入到SessionFactory中--> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="mappingResources"> <list> <value>com/spring/model/user.hbm.xml</value> <value>com/spring/model/userlog.hbm.xml</value> </list> </property> <property name="hibernateProperties"> <value> hibernate.dialect=org.hibernate.dialect.MySQLDialect hibernate.show_sql=true hibernate.hbm2ddl.auto=create </value> </property> </bean> <!-- ---------------------------以上是数据源和sessionFactory的配置 ----------------------------- --> <!-- 声明式事务管理,事务需要数据源,从sessionFactory中拿到 这是一个AOP的应用 --> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <!-- 配置事务要管理的方法 --> <tx:advice transaction-manager="transactionManager" id="txManager"> <tx:attributes> <tx:method name="save" read-only="true"/> </tx:attributes> </tx:advice> <!-- 配置aop设置切面和织入点逻辑 --> <aop:config> <aop:pointcut id="entryPointMethod" expression="execution(public * com.spring.service..*.*(..))"/> <aop:advisor advice-ref="txManager" pointcut-ref="entryPointMethod" /> </aop:config> </beans> ~~~ ### 文档参考Spring官方文档的:9.5.8. Advisingtransactional operations [http://static.springsource.org/spring/docs/2.5.6/reference/transaction.html#transaction-declarative-applying-more-than-just-tx-advice](http://static.springsource.org/spring/docs/2.5.6/reference/transaction.html#transaction-declarative-applying-more-than-just-tx-advice)