SSM10.3【Spring：基于注解的声明式事务控制】

 

 

 

 

代码+环境同10.2
以下仅说明不同的地方

 

package com.haifei.service;

import com.haifei.dao.AccountDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

/**
 * 声明式事务控制明确事项：
 * 谁是切点？   transfer()
 * 谁是通知？   事务控制
 * 配置切面？   AOP配置
 */
@Service("accountService") //注解方式配置service的bean
@Transactional(isolation = Isolation.READ_COMMITTED)
public class AccountServiceImpl implements AccountService{

    @Autowired //注解方式依赖注入（set方法可以省略）
    private AccountDao accountDao;
    /*public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }*/

    //注解方式配置事务，注意虽然也可在直接在类上加事务（对类中所有方法生效），但实际方法上的事务遵从就近原则
    @Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.REQUIRED)
    public void transfer(String outMan,String inMan,double money){
        accountDao.out(outMan,money);
        int i = 1/0; //java.lang.ArithmeticException: / by zero
        accountDao.in(inMan,money);
    }

}

<?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: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/context http://www.springframework.org/schema/context/spring-context.xsd
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
">

    <!--加载外部的properties文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!--配置数据源（数据库连接池）-->
    <bean id="dataSource_c3p0" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <bean id="dataSource_druid" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <!--配置spring jdbcTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource_c3p0"/>  <!--数据源可选c3p0和druid-->
    </bean>


    <!--<bean id="accountDao" class="com.haifei.dao.AccountDaoImpl">
        <property name="template" ref="jdbcTemplate"/>
    </bean>
    <bean id="accountService" class="com.haifei.service.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"/>
    </bean>-->
    
    <!--采用注解方式配置bean及其依赖注入时，要记得开启组件扫描-->
    <!--<context:component-scan base-package="com.haifei.dao" />
    <context:component-scan base-package="com.haifei.service" />-->
    <context:component-scan base-package="com.haifei" />


    <!--配置平台事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource_c3p0"/>
    </bean>

    <!--采用注解方式配置事务时，要配置事务的注解驱动-->
    <tx:annotation-driven transaction-manager="transactionManager"/>

    <!--&lt;!&ndash;配置通知-事务的增强&ndash;&gt;
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="transfer" isolation="REPEATABLE_READ" propagation="REQUIRED" timeout="1" read-only="false"/>
        </tx:attributes>
    </tx:advice>
    &lt;!&ndash;配置事务的AOP织入&ndash;&gt;
    <aop:config>
        <aop:pointcut id="txPointcut" expression="execution(* com.haifei.service.*.*(..))" />
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut" />
    </aop:config>-->

</beans>