使用XML进行声明式事务管理
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 = ...
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<?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" 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"
??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"
??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"
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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
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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());
????
?}
