spring注解方式实现事务

<?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:p="http://www.springframework.org/schema/p"
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.xsd
      http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/aop
         http://www.springframework.org/schema/aop/spring-aop.xsd
         http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx.xsd">



<!-- 数据源对象：C3p0连接池 -->
         <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
          <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
          <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/day15?characterEncoding=utf8"></property>
          <property name="user" value="root"></property>
          <property name="password" value="root"></property>
          <property name="initialPoolSize" value="3"></property>
          <property name="maxPoolSize" value="10"></property>
          <property name="maxStatements" value="100"></property>
          <property name="acquireIncrement" value="2"></property>
         </bean>

<!-- 2. JdbcTemplate工具类实例 -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>

<!-- 事务管理器类 -->
<bean id="txtManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
</bean>

<!-- 开启注解扫描 -->
    <context:component-scan base-package="..anno"></context:component-scan>
    
    <!-- 注解方式实现事务：指定注释方式实现事务 -->
    <tx:annotation-driven transaction-manager="txtManager"/>

</beans>    

@Service
public class UserService {
@Resource
private UserDao userDao;

@Transactional
public void save() {
userDao.save();
int i=1/0;
userDao.save();
}

}

//加入容器
@Repository
public class UserDao  {
    
@Resource
private JdbcTemplate jdbcTemplate;
private void setJdncTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate=jdbcTemplate;
}
public void save() {
String sql="insert into admin(userName,pwd) values('test','123456')";
jdbcTemplate.update(sql);
}
}

public class App {
ApplicationContext ac= new ClassPathXmlApplicationContext("/gz/itcast/anno/bean.xml");
@Test
public void testApp() {
UserService user = (UserService) ac.getBean("userService");
user.save();
}
}