##一、前情提要
此文章时关于基于Xml的方式配置Spring事务管理，由于前面我已经出炉了一篇《【Spring4.0】Spring基于注解方式进行事务管理》，里面已经详细介绍了关于Aop的一些知识点，在这里我就不再详细介绍SpringAOP了，如有需要烦请翻阅我【Spring4.0】系列日志。
##二、前期准备工作
和《【Spring4.0】Spring基于注解方式进行事务管理》一样导入相同的JAR包、同样的数据库数据即可。
##三、示例代码
###（1）在src根目录配置外部连接数据库的属性文件db.properties
jdbc.user=root
jdbc.password=123456
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc\:mysql\://localhost\:3306/spring
jdbc.initPoolSize=5
jdbc.maxPoolSize=10
###（2）在com.spring.tx.xml.service创建相关的接口
BookShopDao
public interface BookShopDao {
//根据书号获取书的单价
public int findBookPriceByIsbn(String isbn);
//更新数的库存. 使书号对应的库存 - 1
public void updateBookStock(String isbn);
//更新用户的账户余额: 使 username 的 balance - price
public void updateUserAccount(String username, int price);
}
BookShopService
public interface BookShopService {
public void purchase(String username, String isbn);
}
Cashier
public interface Cashier {
public void checkout(String username, List<String> isbns);
}
###（3）在com.spring.tx.xml.service.impl创建相关的实现类
BookShopDao的实现类BookShopDaoImpl
package com.spring.tx.xml.service.impl;
import org.springframework.jdbc.core.JdbcTemplate;
import com.spring.tx.xml.BookStockException;
import com.spring.tx.xml.UserAccountException;
import com.spring.tx.xml.service.BookShopDao;
public class BookShopDaoImpl implements BookShopDao {
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
@Override
public int findBookPriceByIsbn(String isbn) {
String sql = "SELECT price FROM book WHERE isbn = ?";
return jdbcTemplate.queryForObject(sql, Integer.class, isbn);
}
@Override
public void updateBookStock(String isbn) {
// 检查书的库存是否足够，若不够则抛出异常
String sql2 = "SELECT stock FROM book_stock WHERE isbn = ?";
int stock = jdbcTemplate.queryForObject(sql2, Integer.class, isbn);
if(stock == 0){
throw new BookStockException("书本库存不足");
}
String sql = "UPDATE book_stock SET stock = stock - 1 WHERE isbn = ?";
jdbcTemplate.update(sql, isbn);
}
@Override
public void updateUserAccount(String username, int price) {
String sql2 = "SELECT balance FROM account WHERE username = ?";
int balance = jdbcTemplate.queryForObject(sql2, Integer.class, username);
if(balance < price){
throw new UserAccountException("余额不足");
}
String sql = "UPDATE account SET balance = balance - ? WHERE username = ?";
jdbcTemplate.update(sql, price, username);
}
}
BookShopService的实现类BookShopServiceImpl
package com.spring.tx.xml.service.impl;
import com.spring.tx.xml.service.BookShopDao;
import com.spring.tx.xml.service.BookShopService;
public class BookShopServiceImpl implements BookShopService {
private BookShopDao bookShopDao;
public void setBookShopDao(BookShopDao bookShopDao) {
this.bookShopDao = bookShopDao;
}
public void purchase(String username, String isbn) {
// 1.获取书的单价
int price = bookShopDao.findBookPriceByIsbn(isbn);
// 2.更新数据库库存
bookShopDao.updateBookStock(isbn);
// 3.更新用户价格
bookShopDao.updateUserAccount(username, price);
}
}
Cashier的实现类CashierImpl
package com.spring.tx.xml.service.impl;
import java.util.List;
import org.springframework.stereotype.Service;
import com.spring.tx.xml.service.BookShopService;
import com.spring.tx.xml.service.Cashier;
@Service("cashier")
public class CashierImpl implements Cashier {
private BookShopService bookShopService;
public void setBookShopService(BookShopService bookShopService) {
this.bookShopService = bookShopService;
}
@Override
public void checkout(String username, List<String> isbns) {
for (String isbn : isbns) {
bookShopService.purchase(username, isbn);
}
}
}
###（4）在com.spring.tx.xml创建异常类
库存不足的异常类BookStockException
package com.spring.tx.xml;
public class BookStockException extends RuntimeException {
/**
*
*/
private static final long serialVersionUID = -8345575141732656052L;
public BookStockException() {
super();
// TODO Auto-generated constructor stub
}
public BookStockException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
// TODO Auto-generated constructor stub
}
public BookStockException(String message, Throwable cause) {
super(message, cause);
// TODO Auto-generated constructor stub
}
public BookStockException(String message) {
super(message);
// TODO Auto-generated constructor stub
}
public BookStockException(Throwable cause) {
super(cause);
// TODO Auto-generated constructor stub
}
}
代表用户余额不足的异常类UserAccountException
package com.spring.tx;
public class UserAccountException extends RuntimeException{
/**
*
*/
private static final long serialVersionUID = 3217299177229543901L;
public UserAccountException() {
super();
// TODO Auto-generated constructor stub
}
public UserAccountException(String message, Throwable cause, boolean enableSuppression,
boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
// TODO Auto-generated constructor stub
}
public UserAccountException(String message, Throwable cause) {
super(message, cause);
// TODO Auto-generated constructor stub
}
public UserAccountException(String message) {
super(message);
// TODO Auto-generated constructor stub
}
public UserAccountException(Throwable cause) {
super(cause);
// TODO Auto-generated constructor stub
}
}
###（5）配置xml文件applicationContext-tx-xml.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!-- 导入外部资源文件 -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 配置C3P0数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
<property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
</bean>
<!-- 配置Spring 的JdbcTemplate -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置bean -->
<bean id="bookShopDao" class="com.spring.tx.xml.service.impl.BookShopDaoImpl">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
<bean id="bookShopService" class="com.spring.tx.xml.service.impl.BookShopServiceImpl">
<property name="bookShopDao" ref="bookShopDao"></property>
</bean>
<bean id="cashier" class="com.spring.tx.xml.service.impl.CashierImpl">
<property name="bookShopService" ref="bookShopService"></property>
</bean>
<!-- 1.配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 2.配置事务属性 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!-- 根据方法名指定事务的属性 -->
<tx:method name="purchase" propagation="REQUIRES_NEW"/>
<tx:method name="get*" read-only="true"/>
<tx:method name="find*" read-only="true"/>
<tx:method name="*" />
</tx:attributes>
</tx:advice>
<!-- 3.配置事务切入点，以及把事务切入点和事务关联起来 -->
<aop:config>
<aop:pointcut expression="execution(* com.spring.tx.xml.service.*.*(..))"
id="txPointCut" />
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut" />
</aop:config>
</beans>