spring事務管理之三:宣告式事務管理:使用xml配置檔案的方式
阿新 • • 發佈:2019-01-09
這種方式是開發中常見的一種方式:利用aop的思想,將需要事務管理的業務方法通過xml配置的方式,將事務管理加在該類的相關方法上。這種方法的優點是,一次xml配置,後期不用關心業務類增加或者減少,通過xml中配置的匹配資訊,會去找業務類所在的包和方法,然後加上事務。
重點是配置<tx:advice>和<aop:config>上。
沿用spring事務管理之前的工程:
pom.xml依賴部分
<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>
這裡為了使用spring-aop,需要額外引入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=hadoop
spring.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);
}
}
單元測試類: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配置事務的重點在於配置切點:
測試事務生效的方法:
1、在xml配置檔案中,將配置事務的部分註釋,不使用事務,業務方法中,將會導致異常的程式碼註釋,正常轉賬。
// int i = 10;
//System.out.println(i);
aaa向bbb轉賬200元,會成功,此時aaa賬戶變為800元,bbb的賬戶變為1200元。
2、將業務程式碼中異常的部分註釋開啟,再次轉賬。aaa給bbb轉賬200,因為異常,aaa的賬戶變為600元,而bbb的賬戶還是1200,錢轉丟了。
3、將spring.xml中關於事務部分的配置去掉註釋,讓事務生效,然後接著轉賬。aaa向bbb轉賬200元,這時候,因為異常會回滾。這時候aaa的賬戶還是600元,bbb的賬戶還是1200元,證明事務生效了。