当多个方法需要事务时，可用XML方式，表达式可灵活配置
a) xml（推荐，可以同时配置好多方法）
i. <bean txmanager
ii. <aop:config
1. <aop:pointcut
2. <aop:advisor pointcut-ref advice-ref
iii. <tx:advice: id transaction-manager = ...
<?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="org.spring"/>
<bean id="dataSource" 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/spring" />
<property name="username" value="root" />
<property name="password" value="root" />
</bean>
<bean id="mySessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.model.User</value>
<value>com.model.Log</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<bean id="txManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="mySessionFactory" />
</bean>
<aop:config>
<aop:pointcut id="bussinesService"
expression="execution(public * com.service..*.*(..))"/>
<aop:advisor pointcut-ref="bussinesService" advice-ref="txAdvice"/>
</aop:config>
<tx:advice id="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="getUser" read-only="true" />
<tx:method name="add*" />
</tx:attributes>
</tx:advice>
</beans>
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txManager指定 使用什么事务类（Hibernate、JDBC、JPA……）
需要参考SessionFactory，从其中读取配置，ref="sessionFactory_id"
而SessionFactory用到了数据源，需参考数据源ID配置
aop:config指定切面配置
aop:pointcut定义切面，表达式
aop:advisor建议者，使用XXX建议，参考的是txAdvice，ref="txAdvice_id"
tx:advice指定事务的建议，需要指明是哪个事务类txManager
tx:attributes事务属性
tx:method 要在name为XXX的方法上，织入切面
如果不指定propagation 默认是 REQUERED
测试：
UserService类：
--------------------
public void add(User user) {
Session session = sessionFactory.getCurrentSession();
session.save(user);
Log log = new Log();
logDAO.save(log);
}
--------------------
Junit：
--------------------
@Test
public void testAdd() throws Exception {
ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
UserService service = (UserService)ctx.getBean("userService");
service.add(new User());
}