(42)事务的两种开发模式

事务的全注解式开发

编写一个类来代替配置文件，代码如下：

packagecom.powernode.bank;importcom.alibaba.druid.pool.DruidDataSource;importorg.springframework.context.annotation.Bean;importorg.springframework.context.annotation.ComponentScan;importorg.springframework.context.annotation.Configuration;importorg.springframework.jdbc.core.JdbcTemplate;importorg.springframework.jdbc.datasource.DataSourceTransactionManager;importorg.springframework.transaction.annotation.EnableTransactionManagement;importjavax.sql.DataSource;/** * @author 动力节点 * @version 1.0 * @className Spring6Config * @since 1.0 **/@Configuration@ComponentScan("com.powernode.bank")@EnableTransactionManagementpublicclassSpring6Config{@BeanpublicDataSourcegetDataSource(){DruidDataSourcedataSource=newDruidDataSource();dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");dataSource.setUrl("jdbc:mysql://localhost:3306/spring6");dataSource.setUsername("root");dataSource.setPassword("root");returndataSource;}@Bean(name="jdbcTemplate")publicJdbcTemplategetJdbcTemplate(DataSourcedataSource){JdbcTemplatejdbcTemplate=newJdbcTemplate();jdbcTemplate.setDataSource(dataSource);returnjdbcTemplate;}@BeanpublicDataSourceTransactionManagergetDataSourceTransactionManager(DataSourcedataSource){DataSourceTransactionManagerdataSourceTransactionManager=newDataSourceTransactionManager();dataSourceTransactionManager.setDataSource(dataSource);returndataSourceTransactionManager;}}

测试程序如下：

@TestpublicvoidtestNoXml(){ApplicationContextapplicationContext=newAnnotationConfigApplicationContext(Spring6Config.class);AccountServiceaccountService=applicationContext.getBean("accountService",AccountService.class);try{accountService.transfer("act-001","act-002",10000);System.out.println("转账成功");}catch(Exceptione){e.printStackTrace();}}

执行结果：

数据库表中数据：

声明式事务之XML实现方式

配置步骤：

• 第一步：配置事务管理器
• 第二步：配置通知
• 第三步：配置切面

记得添加aspectj的依赖：

<!--aspectj依赖--><dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>6.0.0-M2</version></dependency>

Spring配置文件如下：
记得添加aop的命名空间。

<?xml version="1.0" encoding="UTF-8"?><beansxmlns="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.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"><context:component-scanbase-package="com.powernode.bank"/><beanid="dataSource"class="com.alibaba.druid.pool.DruidDataSource"><propertyname="driverClassName"value="com.mysql.cj.jdbc.Driver"/><propertyname="url"value="jdbc:mysql://localhost:3306/spring6"/><propertyname="username"value="root"/><propertyname="password"value="root"/></bean><beanid="jdbcTemplate"class="org.springframework.jdbc.core.JdbcTemplate"><propertyname="dataSource"ref="dataSource"/></bean><!--配置事务管理器--><beanid="transactionManager"class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><propertyname="dataSource"ref="dataSource"/></bean><!--配置通知--><tx:adviceid="txAdvice"transaction-manager="txManager"><tx:attributes><tx:methodname="save*"propagation="REQUIRED"rollback-for="java.lang.Throwable"/><tx:methodname="del*"propagation="REQUIRED"rollback-for="java.lang.Throwable"/><tx:methodname="update*"propagation="REQUIRED"rollback-for="java.lang.Throwable"/><tx:methodname="transfer*"propagation="REQUIRED"rollback-for="java.lang.Throwable"/></tx:attributes></tx:advice><!--配置切面--><aop:config><aop:pointcutid="txPointcut"expression="execution(* com.powernode.bank.service..*(..))"/><!--切面 = 通知 + 切点--><aop:advisoradvice-ref="txAdvice"pointcut-ref="txPointcut"/></aop:config></beans>

将AccountServiceImpl类上的@Transactional注解删除。
编写测试程序：

@TestpublicvoidtestTransferXml(){ApplicationContextapplicationContext=newClassPathXmlApplicationContext("spring2.xml");AccountServiceaccountService=applicationContext.getBean("accountService",AccountService.class);try{accountService.transfer("act-001","act-002",10000);System.out.println("转账成功");}catch(Exceptione){e.printStackTrace();}}

执行结果：

数据库表中记录：

通过测试可以看到配置XML已经起作用了。