接上篇配置，在com.test.spring.tx包下加入业务接口和类
####业务接口类

public interface BookShopService {public void purchase(int userId,int bookId);
}

####业务实现类，注意添加有事务

package com.test.spring.tx;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;@Service("bookShopService")
public class BookShopServiceImpl implements BookShopService{@Autowiredprivate BookShopDao bookShopDao;//声明式事务@Transactional@Overridepublic void purchase(int userId, int bookId) {//1.获取书的单价double price = bookShopDao.getBookPriceByBookId(bookId);//2.更新书的数量bookShopDao.updateBookStock(bookId);//3.更新用户余额bookShopDao.updateUserBalance(userId, price);}}

####测试类

package com.test.spring.tx;import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class TestTx {private ApplicationContext ctx;private BookShopService bookShopService;{ctx = new ClassPathXmlApplicationContext("applicationContext.xml");bookShopService = ctx.getBean(BookShopService.class);}@Testpublic void testBookService(){bookShopService.purchase(1000, 1001);}}

####配置文件

    <context:component-scan base-package="com.test.spring.tx"></context:component-scan><context:property-placeholder location="classpath:db.properties"/><!-- 配置数据源 --><bean id="dataSources" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="user" value="${jdbc.user}"></property><property name="password" value="${jdbc.password}"></property><property name="driverClass" value="${jdbc.driverClass}"></property><property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property><property name="initialPoolSize" value="${jdbc.initPoolSize}"></property><property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property></bean><bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dataSources"></property></bean><!-- 配置事物管理器 --><bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSources"></property></bean><!-- 启用事物注解 --><tx:annotation-driven transaction-manager="transactionManager"/>