Spring4学习笔记-声明式事务（基于配置文件的方式）
BookShopDao接口
public interface BookShopDao {
//根据书号获取书的单价
public int findBookPriceByIsbn(String isbn);
//更新书的库存，使书号对应的库存-1
public void updateBookStock(String isbn);
//更新用户的账户余额，是username的balance-price
public void updateUserAccount(String username, int price);
}
BookShopDao接口的实现类
public class BookShopImpl 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，则抛异常
String s = "select stock from book_stock where isbn = ?";
int stock = jdbcTemplate.queryForObject(s, Integer.class, isbn);
//System.out.println("stock:" + stock);
if (stock <= 0) {
throw new BookStockException("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) {
//验证余额不否足够。若余额不足则抛出异常
String s = "select balance from account where username = ?";
int balance = jdbcTemplate.queryForObject(s, Integer.class, username);
if (balance < price) {
//System.out.println("余额不足");
throw new UserAccountException("余额不足");
}
String sql = "update account set balance = balance - ? where username = ?";
jdbcTemplate.update(sql, price, username);
}
}
BookStockException.java和UserAccountException.java为自定义的两个异常类，继承RuntimeException。
BookShopService接口
public interface BookShopService {
public void purchase(String username, String isbn);
}
BookShopService接口的实现类
public class BookShopServiceImpl implements BookShopService{
private BookShopDao bookShopDao;
public void setBookShopDao(BookShopDao bookShopDao) {
this.bookShopDao = bookShopDao;
}
@Override
public void purchase(String username, String isbn) {
/*
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
*/
//获取书的单价
int price = bookShopDao.findBookPriceByIsbn(isbn);
//更新书的库存
bookShopDao.updateBookStock(isbn);
//更新用户余额
bookShopDao.updateUserAccount(username, price);
}
}
applicationContext.xml配置
<?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: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.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-4.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd">
<context:component-scan base-package="com.spring"></context:component-scan>
<!-- 导入资源文件 -->
<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="driverClass" value="${jdbc.driverClass}"></property>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
<property name="initialPoolSize" value="${jdbc.initialPoolSize}"></property>
<property name="maxPoolSize" value="${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.BookShopImpl">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
<bean id="bookShopService" class="com.spring.tx.xml.BookShopServiceImpl">
<property name="bookShopDao" ref="bookShopDao"></property>
</bean>
<bean id="cashier" class="com.spring.tx.xml.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" timeout="3"/>
<tx:method name="*"/>
<tx:method name="get*" read-only="true"/>
<tx:method name="find*" read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- 3.配置事务切入点，以及把事务切入点和事务属性关联起来 -->
<aop:config>
<aop:pointcut expression="execution(* com.spring.tx.xml.BookShopService.*(..))" id="txPointCut"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
</aop:config>
<aop:config>
<aop:pointcut expression="execution(* com.spring.tx.xml.Cashier.*(..))" id="cashierPointCut"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="cashierPointCut"/>
</aop:config>
</beans>
测试
@Test
public void testTransactionalPropagation() {
cashier.checkout("umgsai", Arrays.asList("1001", "1002"));
}