package cn.mf.dao;public interface AccountDao {    //加钱    void increaseMoney(Integer id,Double money);    //减钱    void decreaseMoney(Integer id,Double money);}

package cn.mf.dao;import org.springframework.jdbc.core.support.JdbcDaoSupport;public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao  {    @Override    public void increaseMoney(Integer id, Double money) {        getJdbcTemplate().update("update account set money = money+? where id = ? ", money,id);    }    @Override    public void decreaseMoney(Integer id, Double money) {        getJdbcTemplate().update("update account set money = money-? where id = ? ", money,id);    }}

package cn.mf.service;public interface AccountService {    //转账方法    void transfer(Integer from,Integer to,Double money);}

package cn.mf.service;import org.springframework.transaction.TransactionStatus;import org.springframework.transaction.annotation.Isolation;import org.springframework.transaction.annotation.Propagation;import org.springframework.transaction.annotation.Transactional;import org.springframework.transaction.support.TransactionCallback;import org.springframework.transaction.support.TransactionCallbackWithoutResult;import org.springframework.transaction.support.TransactionTemplate;import cn.mf.dao.AccountDao;@Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=true)public class AccountServiceImpl implements AccountService {    private AccountDao ad ;    private TransactionTemplate tt;        @Override    @Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=false)    public void transfer(final Integer from,final Integer to,final Double money) {                //减钱                ad.decreaseMoney(from, money);                //int i = 1/0;                //加钱                ad.increaseMoney(to, money);    }    public void setAd(AccountDao ad) {        this.ad = ad;    }    public void setTt(TransactionTemplate tt) {        this.tt = tt;    }}

jdbc.jdbcUrl=jdbc:mysql://localhost:3306/spring?characterEncoding=utf-8jdbc.driverClass=com.mysql.jdbc.Driverjdbc.user=rootjdbc.password=root

<?xml version="1.0" encoding="UTF-8"?><beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" 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-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd "><!-- 指定spring读取db.properties配置 --><context:property-placeholder location="classpath:db.properties"  /><!-- 事务核心管理器,封装了所有事务操作. 依赖于连接池 --><bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >    <property name="dataSource" ref="dataSource" ></property></bean><!-- 事务模板对象 --><bean name="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate" >    <property name="transactionManager" ref="transactionManager" ></property></bean><!-- 开启使用注解管理aop事务 --><tx:annotation-driven/><!-- 1.将连接池 --><bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >    <property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>    <property name="driverClass" value="${jdbc.driverClass}" ></property>    <property name="user" value="${jdbc.user}" ></property>    <property name="password" value="${jdbc.password}" ></property></bean><!-- 2.Dao--><bean name="accountDao" class="cn.mf.dao.AccountDaoImpl" >    <property name="dataSource" ref="dataSource" ></property></bean><!-- 3.Service--><bean name="accountService" class="cn.mf.service.AccountServiceImpl" >    <property name="ad" ref="accountDao" ></property>    <property name="tt" ref="transactionTemplate" ></property></bean>  </beans>

package cn.mf.tx;import javax.annotation.Resource;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import cn.mf.service.AccountService;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration("classpath:applicationContext2.xml")public class Demo2 {    @Resource(name="accountService")    private AccountService as;        @Test    public void fun1(){        as.transfer(1, 2, 100d);    }}