spring配置文件

<?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: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/tx http://www.springframework.org/schema/tx/spring-tx.xsd"><!-- 1.开启 注解 --><context:component-scan base-package="com.test" /><!-- 2.创建数据源对象--><context:property-placeholder location="db.properties" /><bean id="comboPooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="${driverClass}" /><property name="jdbcUrl" value="${url}" /><property name="user" value="${user}" /><property name="password" value="${password}" /></bean><!-- 3.创建JdbcTemplate对象--><bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><constructor-arg name="dataSource" ref="comboPooledDataSource" /></bean><!-- 4 创建一个事务管理器 --><bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="comboPooledDataSource" /></bean><!-- 5.开启事务注解--><tx:annotation-driven transaction-manager="txManager" /></beans>

方法

package com.test.service.impl;import com.test.dao.ICardInfoDao;
import com.test.exception.MyException;
import com.test.service.ICardInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;@Service
public class CardInfoService implements ICardInfoService {@Autowiredprivate ICardInfoDao cardInfoDao;public ICardInfoDao getCardInfoDao() {return cardInfoDao;}public void setCardInfoDao(ICardInfoDao cardInfoDao) {this.cardInfoDao = cardInfoDao;}//实现转账方法@Override//通过注解的方式 声明事务方法 (隔离级别  传播行为  回滚的条件)@Transactional(isolation = Isolation.DEFAULT,propagation = Propagation.REQUIRED,rollbackFor =MyException.class )public void transfer(int from, int to, float money) throws Exception {//一方减钱cardInfoDao.decreaseMoney(from,money);if(true)throw  new MyException("转账异常");//一方加钱cardInfoDao.increaseMoney(to,money);}
}