Spring中使用事务搭建转账环境转账操作一个账户要减少资金操作一个账户要增加资金操作，如果在两个操作间出现异常转账失败所以要使用事务

本文主要是介绍Spring中使用事务搭建转账环境转账操作一个账户要减少资金操作一个账户要增加资金操作，如果在两个操作间出现异常转账失败所以要使用事务，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

演示不使用事务出现异常情况

Dao层两个方法lessMoney（）和moreMoney（）

package com.swift;import org.springframework.jdbc.core.JdbcTemplate;public class AccountDao {private JdbcTemplate jdbcTemplate;public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {this.jdbcTemplate = jdbcTemplate;}//少钱的方法public void lessMoney(String from,double number) {String sql="update account set money=money-? where username=?";jdbcTemplate.update(sql, number,from);}//多钱的方法public void moreMoney(String to,double number) {String sql="update account set money=money+? where username=?";jdbcTemplate.update(sql, number,to);}
}

Service层调用两个方法

package com.swift;public class AccountService {private AccountDao accountDao;public void setAccountDao(AccountDao accountDao) {this.accountDao = accountDao;}public void moneyTransfer(String from,String to,double number) {accountDao.lessMoney(from,number);int i=10/0;accountDao.moreMoney(to,number);}
}

但是两个操作减与加之间，如果出现异常，则会导致转账钱已经转了，但对方却没有到账的bug，可能服务器突然故障等引起

解决添加事务，出现异常进行回滚操作

下面使用配置文件的方法进行事务管理

没有改变的测试类

package com.swift;import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;@WebServlet("/test")
public class ServletTest extends HttpServlet {private static final long serialVersionUID = 1L;public ServletTest() {super();}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");response.getWriter().append("Served at: ").append(request.getContextPath());//使用JdbcTemplat的queryForObject方法ApplicationContext context=new ClassPathXmlApplicationContext("c3p0.xml");AccountService accountService= (AccountService) context.getBean("accountService");accountService.moneyTransfer("佣兵组织", "高扬", 100000);}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request, response);}}

使用配置文件进行事务处理步骤如下：

<?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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"><!-- c3p0连接池得到dataSource --><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/sw_database"></property><property name="user" value="root"></property><property name="password" value="root"></property></bean><!-- 第一步 配置事务管理器 --><bean id="transactionManager"class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><!-- 注入dataSource --><property name="dataSource" ref="dataSource"></property></bean><!-- 第二步 配置事务增强 --><tx:advice id="txadvice" transaction-manager="transactionManager"><!-- 做事务操作 --><tx:attributes><!-- 事务操作的方法匹配规则 --><tx:method name="money*" propagation="REQUIRED"/></tx:attributes></tx:advice><!-- 第三步 配置切面 --><aop:config><!-- 切入点 --><aop:pointcut expression="execution(* com.swift.AccountService.*(..))" id="pointcut1"/><!-- 切面 --><aop:advisor advice-ref="txadvice" pointcut-ref="pointcut1"/></aop:config><bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dataSource"></property></bean><bean id="accountDao" class="com.swift.AccountDao"><property name="jdbcTemplate" ref="jdbcTemplate"></property></bean><bean id="accountService" class="com.swift.AccountService"><property name="accountDao" ref="accountDao"></property></bean></beans>

分三个步骤管理增强和切面

虽然还是会有异常，但是数据库中不会出错，不会钱转出了，却没有到账

工具类Account

package com.swift;public class Account {private int id;private String username;private String money;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getMoney() {return money;}public void setMoney(String money) {this.money = money;}public Account(int id, String username, String money) {this.id = id;this.username = username;this.money = money;}public Account() {super();// TODO Auto-generated constructor stub
    }@Overridepublic String toString() {return "Account [id=" + id + ", username=" + username + ", money=" + money + "]";}}