赞
踩
启动Mysql:管理员身份打开cmd,输入指令net start mysql
创建数据库及账户表:
create database spring_day03;
use spring_day03;
create table account(
id int primary key auto_increment,
username varchar(50),
money INT
);
insert into account(username,money) values('jack','10000');
insert into account(username,money) values('rose','10000');
导入jar包到MyEclipse
核心:4+1
aop : 4 (aop联盟、spring aop、aspectj规范、spring aspect)
数据库:2 (jdbc/tx)
驱动:mysql
连接池:c3p0
包很多!所以我找全后上传到了网盘,可自取
链接:https://pan.baidu.com/s/1BPUa5VexRO5SsTvLbLOL6g
提取码:n0mp
在MyEclipse里面创建Dao层和Service层
(1)Dao层
dao接口:
package com.lovejava.dao;
/**
* @Description Spring实现转账案例————dao层:接口中有汇款和收款抽象方法
*/
public interface AccountDao {
/*
汇款
*/
public void out(String outer,Integer money);
/*
收款
*/
public void in(String inner,Integer money);
}
dao接口实现类(继承JdbcDaoSupport类)
package com.lovejava.dao.impl; import org.springframework.jdbc.core.support.JdbcDaoSupport; import com.lovejava.dao.AccountDao; public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao { //通过继承JdbcDaoSupport类来实现Dao //实现汇款方法 public void out(String outer, Integer money) { this.getJdbcTemplate().update("update account set money=money-? where username=?", money,outer); } //实现收款方法 public void in(String inner, Integer money) { this.getJdbcTemplate().update("update account set money=money+? where username=?", money,inner); } }
(2)Service层
Service接口
package com.lovejava.service;
/**
* @Description service层:具体的用户转账操作
*/
public interface AccountService {
/**
* @Description 转账
*/
public void transfer(String outer,String inner,Integer money);
}
Service接口实现类:
package com.lovejava.service.Impl; import com.lovejava.dao.AccountDao; import com.lovejava.service.AccountService; public class AccountServiceImpl implements AccountService { //转账要使用到Dao private AccountDao accountDao; public void setAccountDao(AccountDao accountDao){ this.accountDao=accountDao; } public void transfer(String outer, String inner, Integer money) { accountDao.out(outer, money); accountDao.in(inner, money); } }
配置文件:applicationContext.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: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/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 连接数据库 --> <!-- 1 datasource --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver"></property> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring_day03"></property> <property name="user" value="root"></property> <property name="password" value="root123"></property> </bean> <!-- 2 Dao --> <bean id="accountDao" class="com.lovejava.dao.impl.AccountDaoImpl"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 3 Service --> <bean id="accountService" class="com.lovejava.service.Impl.AccountServiceImpl"> <property name="accountDao" ref="accountDao"></property> </bean> </beans>
测试Bean是否注入成功:
package com.lovejava; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.lovejava.service.AccountService; /** * @Description 测试配置文件 * @author zxx * @version v0.0 * @date 2019-7-27 */ public class TestApp { @Test public void demo01(){ String xmlPath="applicationContext.xml"; ApplicationContext applicationContext=new ClassPathXmlApplicationContext(xmlPath); AccountService accountService=(AccountService)applicationContext.getBean("accountService"); accountService.transfer("jack", "rose", 1000); //jack给rose转账1000元 } }
运行后,数据库中表数据确实改变了:
在spring xml 配置aop 自动生成代理,进行事务的管理
三步骤:
只需要修改XML文件,添加事务管理(包括上面的三个步骤:配置管理器、事务详情、AOP)
<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.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"> <!-- 连接数据库 --> <!-- 1 datasource --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver"></property> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring_day03"></property> <property name="user" value="root"></property> <property name="password" value="root123"></property> </bean> <!-- 2 Dao --> <bean id="accountDao" class="com.lovejava.dao.impl.AccountDaoImpl"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 3 Service --> <bean id="accountService" class="com.lovejava.service.Impl.AccountServiceImpl"> <property name="accountDao" ref="accountDao"></property> </bean> <!-- 4 事务管理 --> <!-- 4.1 事务管理器 --> <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 4.2 事务详情 (事务通知),在AOP筛选的基础上对ABC三个方法确定使用什么样的事务。例如,AC读写,B只读 等 tx:attributes 用于配置事务详情(属性) tx:method name="" 详情的具体配置 name:转账方法 propagation传播行为 isolation隔离级别 --> <tx:advice id="txAdvice" transaction-manager="txManager"> <tx:attributes> <tx:method name="transfer" propagation="REQUIRED" isolation="DEFAULT"/> </tx:attributes> </tx:advice> <!-- 4.3 AOP编程:目标类ABCD四个方法(四个连接点),切入点表达式确定增强的连接器,从而获得切入点:ABC --> <aop:config> <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.lovejava.service..*.*(..))"/> </aop:config> </beans>
这种方法需要做的事:
1.配置事务管理器,将并事务管理器交予spring
<!-- 4 事务管理 基于注解-->
<!-- 4.1 事务管理器 -->
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 4.2 将管理器交予spring
* transaction-manager 配置事务管理器
* proxy-target-class=true : 底层强制使用cglib 代理
-->
<tx:annotation-driven transaction-manager="txManager" />
2.AccountServiceImpl类中添加注解()
package com.lovejava.service.Impl; import org.springframework.transaction.annotation.Transactional; //添加注解 import com.lovejava.dao.AccountDao; import com.lovejava.service.AccountService; @Transactional public class AccountServiceImpl implements AccountService { //转账要使用到Dao private AccountDao accountDao; public void setAccountDao(AccountDao accountDao){ this.accountDao=accountDao; } public void transfer(String outer, String inner, Integer money) { accountDao.out(outer, money); accountDao.in(inner, money); } }
使用注解时,在注解后面加括号,括号内可以描述事务详情
Copyright © 2003-2013 www.wpsshop.cn 版权所有,并保留所有权利。