spring使用编程式事务管理实现银行中两个账户转账

spring使用编程式事务管理实习银行中两个账户转账 (不推荐使用，事务操作侵入业务逻辑代码)

Spring 提供的事务模版类：org.springframework.transaction.support.TransactionTemplate
事务管理器：org.springframework.jdbc.datasource.DataSourceTransactionManager

BankDao接口

package com.java1234.dao;

public interface BankDao {

   public void inMoney(int money,int userId);

   public void outMoney(int money,int userId);
}

BankDaoImpl实现类

package com.java1234.dao.impl;

import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;

import com.java1234.dao.BankDao;

public class BankDaoImpl implements BankDao{

   private NamedParameterJdbcTemplate namedParameterJdbcTemplate;


   public void setNamedParameterJdbcTemplate(
           NamedParameterJdbcTemplate namedParameterJdbcTemplate) {
       this.namedParameterJdbcTemplate = namedParameterJdbcTemplate;
   }

   @Override
   public void inMoney(int money, int userId) {
       // TODO Auto-generated method stub
       String sql="update t_count2 set count=count+:money where userId=:userId";
       MapSqlParameterSource sps=new MapSqlParameterSource();
       sps.addValue("money", money);
       sps.addValue("userId", userId);
       namedParameterJdbcTemplate.update(sql,sps);
   }

   @Override
   public void outMoney(int money, int userId) {
       // TODO Auto-generated method stub
       String sql="update t_count set count=count-:money where userId=:userId";
       MapSqlParameterSource sps=new MapSqlParameterSource();
       sps.addValue("money", money);
       sps.addValue("userId", userId);
       namedParameterJdbcTemplate.update(sql,sps);
   }

}

BankService 接口

package com.java1234.service;

public interface BankService {

   /**
   * A向B转账count元
   * @param count
   * @param userIdA
   * @param userIdB
   */
   public void transferAccounts(int count,int userIdA,int userIdB);
}

BankServiceImpl 实现类

package com.java1234.service.impl;

import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;

import com.java1234.dao.BankDao;
import com.java1234.service.BankService;

public class BankServiceImpl implements BankService{

   private BankDao bankDao;

   private TransactionTemplate transactionTemplate;

   public void setBankDao(BankDao bankDao) {
       this.bankDao = bankDao;
   }

   public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
       this.transactionTemplate = transactionTemplate;
   }

   @Override
   public void transferAccounts(final int count, final int userIdA, final int userIdB) {
       // TODO Auto-generated method stub
       transactionTemplate.execute(new TransactionCallbackWithoutResult() {

           @Override
           protected void doInTransactionWithoutResult(TransactionStatus arg0) {
               // TODO Auto-generated method stub
               bankDao.outMoney(count, userIdA);
               bankDao.inMoney(count, userIdB);
           }
       });
   }

}

测试类

package com.java1234.test;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.java1234.service.BankService;

public class T {

private ApplicationContext ac;

   @Before
   public void setUp() throws Exception {
       ac=new ClassPathXmlApplicationContext("beans.xml");
   }

   @Test
   public void transferAccounts() {
       BankService bankService=(BankService)ac.getBean("bankService");
       bankService.transferAccounts(50, 1, 2);
   }

}

beans.xml

<?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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">

   <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>


<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
   <property name="dataSource" ref="dataSource"></property>
</bean>

<bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
   <property name="transactionManager" ref="transactionManager"></property>
</bean>

   <context:property-placeholder location="jdbc.properties"/>

<bean id="namedParameterJdbcTemplate" class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
   <constructor-arg ref="dataSource"></constructor-arg>
</bean>


   <bean id="bankDao" class="com.java1234.dao.impl.BankDaoImpl">
       <property name="namedParameterJdbcTemplate" ref="namedParameterJdbcTemplate"></property>
   </bean>

   <bean id="bankService" class="com.java1234.service.impl.BankServiceImpl">
       <property name="bankDao" ref="bankDao"></property>
       <property name="transactionTemplate" ref="transactionTemplate"></property>
   </bean>

</beans>

spring使用编程式事务管理实现银行中两个账户转账

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