Spring_使用XML文件的方式配置事务 步骤:
正常配置jdbctemplate 正常配置bean 配置事物管理器 配置事物管理器 配置aop切入点,通过切入点把事物链接起来 思路:
接着上一个买书的例子吧,直接拷到新包下,把注解都干掉,需要自动引入的直接set方法
package com.spring.bean;
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);
}
package com.spring.bean;
import org.springframework.jdbc.core.JdbcTemplate;
public class BookShopDaoImpl implements BookShopDao {
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
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("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) {
//验证余额是否足够, 若不足, 则抛出异常
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);
}
}
package com.spring.bean;
public interface BookShopService {
public void purchase(String username, String isbn);
}
package com.spring.bean;
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) {}
//1. 获取书的单价
int price = bookShopDao.findBookPriceByIsbn(isbn);
//2. 更新数的库存
bookShopDao.updateBookStock(isbn);
//3. 更新用户余额
bookShopDao.updateUserAccount(username, price);
}
}
package com.spring.bean;
import java.util.List;
public interface Cashier {
public void checkout(String username, List<String> isbns);
}
package com.spring.bean;
import java.util.List;
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);
}
}
}
自定义异常不贴了,和上节代码一样
bean配置文件
<?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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<!-- 导入资源文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置 mysql 数据源 -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="username" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="url" value="${jdbc.jdbcUrl}"></property>
<property name="driverClassName" value="${jdbc.driverClass}"></property>
</bean>
<!-- 配置 Spirng 的 JdbcTemplate -->
<bean id="jdbcTemplate"
class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置 NamedParameterJdbcTemplate, 该对象可以使用具名参数, 其没有无参数的构造器, 所以必须为其构造器指定参数 -->
<bean id="namedParameterJdbcTemplate"
class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
<constructor-arg ref="dataSource"></constructor-arg>
</bean>
<!-- 配置bean -->
<bean id="bookShopDao" class="com.spring.bean.BookShopDaoImpl">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
<bean id="bookShopService" class="com.spring.bean.BookShopServiceImpl">
<property name="bookShopDao" ref="bookShopDao"></property>
</bean>
<bean id="cashier" class="com.spring.bean.CashierImpl">
<property name="bookShopService" ref="bookShopService"></property>
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置事物属性 -->
<tx:advice id="txadvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="purchase" propagation="REQUIRES_NEW"/>
<tx:method name="find*" read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- 配置事物切入点,把事物通过切入点连接起来 -->
<aop:config>
<aop:pointcut expression="execution(* com.spring.bean.*.*(..))"
id="txPointCut"/>
<aop:advisor advice-ref="txadvice" pointcut-ref="txPointCut"/>
</aop:config>
<!-- <aop:config>
<aop:pointcut expression=" execution(* com.spring.bean.* . *(..))" id="pointcut"/>
<aop:advisor advice-ref="txadvice" pointcut-ref="pointcut"/>
</aop:config> -->
</beans>
注意,
如果配置文件正确,报错空指针异常,一般是@Autowired的实体,,没用set方法创建实体
报错信息如下:
org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 15 in XML document from class path resource [beans.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 15; columnNumber: 15; cvc-complex-type.2.4.c: 通配符的匹配很全面, 但无法找到元素 'aop:config' 的声明。
一般是配置文件的顶部没有导入相应的aop schema命名空间,把命名空间加上即可。
EOF
本文作者:久曲建的测试窝 本文链接:https://www.cnblogs.com/longronglang/p/6298200.html 关于博主:评论和私信会在第一时间回复。或者直接私信我。 版权声明:本博客所有文章除特别声明外,均采用 BY-NC-SA 许可协议。转载请注明出处! 声援博主:如果您觉得文章对您有帮助,可以点击文章右下角【推荐】一下。您的鼓励是博主的最大动力!