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

<!-- 开启注解的事务管理 -->
<tx:annotation-driven transaction-manager="transactionManager"/>

<?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.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">
  <!-- 引入外部属性文件. -->
  <context:property-placeholder location="classpath:jdbc.properties"/>
  <!-- 配置c3p0连接池 -->
  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="${jdbc.driver}"/>
    <property name="jdbcUrl" value="${jdbc.url}"/>
    <property name="user" value="${jdbc.user}"/>
    <property name="password" value="${jdbc.password}"/>
  </bean>
  <!-- 业务层类 -->
  <bean id="accountService" class="cn.itcast.spring3.demo4.AccountServiceImpl">
    <!-- 在业务层注入Dao -->
    <property name="accountDao" ref="accountDao"/>
  </bean>
  <!-- 持久层类 -->
  <bean id="accountDao" class="cn.itcast.spring3.demo4.AccountDaoImpl">
    <!-- 注入连接池的对象,通过连接池对象创建模板. -->
    <property name="dataSource" ref="dataSource"/>
  </bean>
  <!-- 事务管理器 -->
  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"/>
  </bean>
  <!-- 开启注解的事务管理 -->
  <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

package cn.itcast.spring3.demo4;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
@Transactional(isolation=Isolation.DEFAULT,propagation=Propagation.REQUIRED,readOnly=false)
public class AccountServiceImpl implements AccountService {
  private AccountDao accountDao;
  public void setAccountDao(AccountDao accountDao) {
    this.accountDao = accountDao;
  }
  /**
   * 转账的方法
   * 
   * @param from
   *            :从哪转出
   * @param to
   *            :转入的人
   * @param money
   *            :转账金额
   */
  public void transfer(final String from, final String to, final Double money) {
    accountDao.out(from, money);
    //int d = 1 / 0;
    accountDao.in(to, money);
  }
}