spring框架学习spring管理事务方式之注解配置

Posted 2020-09-12 沐风

1.DAO

AccountDao.java

package cn.mf.dao;

public interface AccountDao {
    //加钱
    void increaseMoney(Integer id,Double money);
    //减钱
    void decreaseMoney(Integer id,Double money);
}

AccountDaoImpl.java

package cn.mf.dao;

import org.springframework.jdbc.core.support.JdbcDaoSupport;

public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao  {

    @Override
    public void increaseMoney(Integer id, Double money) {
        getJdbcTemplate().update("update account set money = money+? where id = ? ", money,id);
    }

    @Override
    public void decreaseMoney(Integer id, Double money) {
        getJdbcTemplate().update("update account set money = money-? where id = ? ", money,id);
    }

}

2.SERVICE
AccountService.java

package cn.mf.service;

public interface AccountService {
    //转账方法
    void transfer(Integer from,Integer to,Double money);
}

AccountServiceImpl.java

package cn.mf.service;

import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.support.TransactionCallback;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;

import cn.mf.dao.AccountDao;

@Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=true)
public class AccountServiceImpl implements AccountService {

    private AccountDao ad ;
    private TransactionTemplate tt;
    
    @Override
    @Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=false)
    public void transfer(final Integer from,final Integer to,final Double money) {
                //减钱
                ad.decreaseMoney(from, money);
                //int i = 1/0;
                //加钱
                ad.increaseMoney(to, money);
    }

    public void setAd(AccountDao ad) {
        this.ad = ad;
    }

    public void setTt(TransactionTemplate tt) {
        this.tt = tt;
    }
}

3.db.properties

jdbc.jdbcUrl=jdbc:mysql://localhost:3306/spring?characterEncoding=utf-8
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=root

4.applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" 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-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd ">

<!-- 指定spring读取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties"  />

<!-- 事务核心管理器,封装了所有事务操作. 依赖于连接池 -->
<bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
    <property name="dataSource" ref="dataSource" ></property>
</bean>
<!-- 事务模板对象 -->
<bean name="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate" >
    <property name="transactionManager" ref="transactionManager" ></property>
</bean>

<!-- 开启使用注解管理aop事务 -->
<tx:annotation-driven/>

<!-- 1.将连接池 -->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
    <property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>
    <property name="driverClass" value="${jdbc.driverClass}" ></property>
    <property name="user" value="${jdbc.user}" ></property>
    <property name="password" value="${jdbc.password}" ></property>
</bean>



<!-- 2.Dao-->
<bean name="accountDao" class="cn.mf.dao.AccountDaoImpl" >
    <property name="dataSource" ref="dataSource" ></property>
</bean>
<!-- 3.Service-->
<bean name="accountService" class="cn.mf.service.AccountServiceImpl" >
    <property name="ad" ref="accountDao" ></property>
    <property name="tt" ref="transactionTemplate" ></property>
</bean>  

</beans>

Junit

package cn.mf.tx;

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 cn.mf.service.AccountService;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext2.xml")
public class Demo2 {
    @Resource(name="accountService")
    private AccountService as;
    
    @Test
    public void fun1(){
        as.transfer(1, 2, 100d);
    }
}