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这种方式是开发中常见的一种方式：利用aop的思想，将需要事务管理的业务方法通过xml配置的方式，将事务管理加在该类的相关方法上。这种方法的优点是，一次xml配置，后期不用关心业务类增加或者减少，通过xml中配置的匹配信息，会去找业务类所在的包和方法，然后加上事务。
重点是配置<tx:advice>和<aop:config>上。
沿用spring事务管理之前的工程：
pom.xml依赖部分
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.13</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
</dependencies>这里为了使用spring-aop，需要额外引入aspectjweaver的包。
jdbc.properties
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///shop?useUnicode=true&useSSL=false
jdbc.username=hadoop
jdbc.password=hadoopspring.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: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-4.3.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.3.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">
<context:property-placeholder location="classpath:jdbc.properties"/>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<bean id="accountDao" class="com.xxx.springtransaction.dao.impl.AccountDaoImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="accountService"
class="com.xxx.springtransaction.service.impl.AccountServiceImpl">
<property name="accountDao" ref="accountDao"></property>
</bean>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- spring transaction aspectj xml -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="transfer" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut expression="execution(* com.xxx.springtransaction.service..*(..))"
id="pointcut"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut"/>
</aop:config>
</beans>
AccountDao.java
package com.xxx.springtransaction.dao;
public interface AccountDao {
public void transferIn(String id,Double money);
public void transferOut(String id,Double money);
public Double findById(String id);
}
AccountDaoImpl.java
package com.xxx.springtransaction.dao.impl;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import com.xxx.springtransaction.dao.AccountDao;
public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {
@Override
public void transferIn(String id, Double money) {
String sql = "update account set money = money + ? where id = ?";
getJdbcTemplate().update(sql, money,id);
}
@Override
public void transferOut(String id, Double money) {
String sql = "update account set money = money - ? where id = ?";
getJdbcTemplate().update(sql, money,id);
}
@Override
public Double findById(String id){
return null;
}
}
AccountService.java
package com.xxx.springtransaction.service;
public interface AccountService {
public void transfer(String out,String in,Double money);
public Double findById(String id);
}
AccountServiceImpl.java
package com.xxx.springtransaction.service.impl;
import com.xxx.springtransaction.dao.AccountDao;
import com.xxx.springtransaction.service.AccountService;
public class AccountServiceImpl implements AccountService {
private AccountDao accountDao;
public void setAccountDao(AccountDao accountDao) {
this.accountDao = accountDao;
}
@Override
public void transfer(String out, String in, Double money) {
accountDao.transferOut(out, money);
//int i = 1/0;
//System.out.println(i);
accountDao.transferIn(in, money);
}
@Override
public Double findById(String id){
return accountDao.findById(id);
}
}
单元测试类：SpringTransactionTest.java
package com.xxx.springtransaction;
import javax.annotation.Resource;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.xxx.springtransaction.service.AccountService;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:spring.xml")
public class SpringTransactionTest {
@Resource
private AccountService accountService;
@Test
public void demo1(){
accountService.transfer("1", "2", 200d);
}
}
aspectj+xml配置事务的重点在于配置切点：
测试事务生效的方法：
1、在xml配置文件中，将配置事务的部分注释，不使用事务，业务方法中，将会导致异常的代码注释，正常转账。
// int i = 10;
//System.out.println(i);
aaa向bbb转账200元，会成功，此时aaa账户变为800元，bbb的账户变为1200元。
2、将业务代码中异常的部分注释打开，再次转账。aaa给bbb转账200，因为异常，aaa的账户变为600元，而bbb的账户还是1200，钱转丢了。
3、将spring.xml中关于事务部分的配置去掉注释，让事务生效，然后接着转账。aaa向bbb转账200元，这时候，因为异常会回滚。这时候aaa的账户还是600元，bbb的账户还是1200元，证明事务生效了。