Spring 事务管理

 Spring 事务管理方式 有两种

    1. 编写代码时实现事务 定义事务， 程序正常执行 ， 异常抛出事务

   2.基于AOP技术实现声明是事务，  可以将事务管理设置 为一"方面"  

Spring 2.5 实现声明式事务 基于AOP技术  其优点是无需编程的方式管理事务  只需配置相关配置文件就可以

事务管理主要是任务 

创建事务 事务的回滚 事务提交 

第一步 实现实体类 和映射文件

hibernate实现 文件

第二步 实现Dao层

package com.sun.Dao;

 

import java.util.List;

 

import com.sun.entity.Account;

 

public interface AccountDao {

public List getAccountByAccountNo(String accountNo);

public void transfer(Account a1,Account a2);

 

}

package com.sun.Dao;

import java.sql.SQLException;

import java.util.List;

import org.hibernate.Criteria;

import org.hibernate.HibernateException;

import org.hibernate.classic.Session;

import org.hibernate.criterion.Restrictions;

import org.springframework.orm.hibernate3.HibernateCallback;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.sun.entity.Account;

public class AccountDaoImpl extends HibernateDaoSupport implements AccountDao {

public List getAccountByAccountNo(final String accountNo) {

// TODO Auto-generated method stub

return super.getHibernateTemplate().executeFind(

new HibernateCallback() {

public Object doInHibernate(org.hibernate.Session session)

throws HibernateException, SQLException {

Criteria c = session.createCriteria(Account.class);

c.add(Restrictions.eq("accountNo", accountNo));

return c.list();

}

});

}

// 转账

public void transfer(Account a1, Account a2) {

// TODO Auto-generated method stub

super.getHibernateTemplate().update(a1);

super.getHibernateTemplate().update(a2);

}

第三步 

 实现BIz 层

package com.sun.Biz;

 

import java.util.List;

 

import com.sun.entity.Account;

 

public interface AccountBiz {

public List getAccountByAccountNo(String accountNo);

public void transfer(Account a1,Account a2);

 

}

package com.sun.Biz;

 

import java.util.List;

 

import com.sun.Dao.AccountDao;

import com.sun.entity.Account;

 

public class AccountBizImpl implements AccountBiz {

AccountDao accountdao;

 

public AccountDao getAccountdao() {

return accountdao;

}

 

public void setAccountdao(AccountDao accountdao) {

this.accountdao = accountdao;

}

 

public List getAccountByAccountNo(String accountNo) {

// TODO Auto-generated method stub

return accountdao.getAccountByAccountNo(accountNo);

}

 

public void transfer(Account a1, Account a2) {

// TODO Auto-generated method stub

     accountdao.transfer(a1, a2);

}

 

}

第四步 创建action

package com.sun.action;

import java.util.List;

import com.opensymphony.xwork2.ActionSupport;

import com.sun.Biz.AccountBiz;

import com.sun.entity.Account;

public class AccountMessage extends ActionSupport {

/**

* @return

*/

private String ac1;

private String ac2;

private String amount;

public String getAc1() {

return ac1;

}

public void setAc1(String ac1) {

this.ac1 = ac1;

}

public String getAc2() {

return ac2;

}

public void setAc2(String ac2) {

this.ac2 = ac2;

}

public String getAmount() {

return amount;

}

public void setAmount(String amount) {

this.amount = amount;

}

AccountBiz accountbiz;

public AccountBiz getAccountbiz() {

return accountbiz;

}

public void setAccountbiz(AccountBiz accountbiz) {

this.accountbiz = accountbiz;

}

public String execute() throws Exception{

// TODO Auto-generated method stub

Account a1=null;

Account a2 =null;

List list1=accountbiz.getAccountByAccountNo(ac1);

if (list1.size()>0) {

a1=(Account) list1.get(0);

a1.setBalance(new Long(a1.getBalance().longValue()-Long.parseLong(amount)));

}

List list2=accountbiz.getAccountByAccountNo(ac2);

if (list2.size()>0) {

a2=(Account) list2.get(0);

a2.setBalance(new Long(a2.getBalance().longValue()-Long.parseLong(amount)));

}

try {

accountbiz.transfer(a1, a2);

} catch (Exception e) {

// TODO: handle exception

return "error";

}

//获取第二的A2的帐号对象 兵更新对象中的帐号的余额的属性

return SUCCESS;

}

}

第五步 Spring 中配置Dao biz  和 AoccountMessage

<bean id="sessionFactory"

class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

<property name="dataSource">

<ref bean="dataSource" />

</property>

<property name="hibernateProperties">

<props>

<prop key="hibernate.dialect">

org.hibernate.dialect.MySQLDialect

</prop>

</props>

</property>

</bean>

<!-- 定义dao类事例 -->

<bean id="accountdao" class="com.sun.Dao.AccountDaoImpl">

<property name="sessionFactory" ref="sessionFactory"></property>

</bean>

<bean id="accountbiz" class="com.sun.Biz.AccountBizImpl">

<property name="accountdao" ref="accountdao"></property>

</bean>

<!-- -部署Struts的责帐 号管理的控制器 accountmessage 并给Accountmessage类中的accountbiz属性组织 -->

<bean id="amAction" class="com.sun.action.AccountMessage">

<property name="accountbiz" ref="accountbiz"></property>

</bean>

</beans>

  第六步 Struts.xml中配置accountMessage

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>

 

<package name="demo" extends="struts-default">

<action name="dotransfer" class="com.sun.action.AccountMessage">

<result name="error">error.jsp</result>

<result name="success">success.jsp</result>

</action>

</package>

</struts>    

第七部 配置声明事务

<?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:aop="http://www.springframework.org/schema/aop"

xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"

xsi:schemaLocation="http://www.springframework.org/schema/beans 

http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

http://www.springframework.org/schema/tx 

http://www.springframework.org/schema/tx/spring-tx-2.0.xsd 

http://www.springframework.org/schema/aop 

http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">

<!-- 声明事务管理器 -->

<bean id="myHibTransactionManager"

class="org.springframework.orm.hibernate3.HibernateTransactionManager">

<property name="sessionFactory" ref="sessionFactory"></property>

</bean>

<!-- 定义事务通知 -->

<tx:advice id="txAdvice" transaction-manager="myHibTransactionManager">

<!-- 指定事务传播规则 -->

<tx:attributes>

<!-- 对get打头的方法应用SUPPORTS事务规则 -->

<tx:method name="get*" propagation="SUPPORTS" />

<!-- 对其他方法应用REQUIRED事务规则 -->

<tx:method name="*" propagation="REQUIRED"></tx:method>

</tx:attributes>

</tx:advice>

<!-- 定义一个切面 并将事务和切面结合 -->

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">

<property name="driverClassName" value="com.mysql.jdbc.Driver">

</property>

<property name="url" value="jdbc:mysql://localhost:3306/bookshop">

</property>

<property name="username" value="root"></property>

<property name="password" value="123"></property>

</bean>

<!-- 定义切面，并将事务通知和切面组合（定义哪些方法应用事务规则） -->

<aop:config>

<!-- 对com.ssh2test1.biz包下的所有类的所有方法都应用事务规则 -->

<aop:pointcut id="bizMethods" expression="execution(* com.sun.Biz.*.*(..))" />

<!-- 将事务通知和切面组合 -->

<aop:advisor advice-ref="txAdvice" pointcut-ref="bizMethods" />

</aop:config>

最后编写 前台

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib uri="/struts-tags"  prefix="s"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>My JSP 'transfer.jsp' starting page</title>

    

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">    

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

<!--

<link rel="stylesheet" type="text/css" href="styles.css">

-->

<s:head/>

  </head>

  <body> 

    <s:form action="dotransfer.action">

      <table>

        <tr>

         <s:textfield name="ac1" label="帐号1"></s:textfield>

        </tr>

         <tr>

         <s:textfield name="ac2" label="帐号2"></s:textfield>

        </tr>

         <tr>

         <s:textfield name="amount" label="转账金额"></s:textfield>

         

        </tr>

        <tr>

        <s:submit value="转账"></s:submit>

        </tr>

      </table>

    </s:form> <br>

  </body>

</html>