配置类：

package com.zzy.spring5.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.event.TransactionalEventListener;

import javax.sql.DataSource;

@Configuration//声明配置类
@ComponentScan(basePackages = "com.zzy.spring5")//组件扫描
@EnableTransactionManagement//开启事务

public class SpringConfig {
    //创建数据库连接池
    @Bean
    public DruidDataSource getDruidDataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("url");
        dataSource.setUsername("root");
        dataSource.setPassword("root");
        return dataSource;
    }

    //创建jdbcTemplate对象
    @Bean
    public JdbcTemplate getJdbcTemplate(DataSource dataSource){
        //到ioc容器中根据类型找到dataSource
        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        //注入dataSource
        jdbcTemplate.setDataSource(dataSource);
        return jdbcTemplate;
    }

    //创建事务管理器
    @Bean
    public DataSourceTransactionManager getDataSourceTransactionManager(DataSource dataSource){
        DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();
        dataSourceTransactionManager.setDataSource(dataSource);
        return dataSourceTransactionManager;
    }
}

在Service类上方添加注解

package com.zzy.spring5.service;

import com.zzy.spring5.dao.UserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
@Transactional(  )
public class UserService {

    @Autowired
    private UserDao userDao;
    public void tran(){
        userDao.withdraw(1,100);
        int a = 10;
        a = a/0;
        userDao.transfer(2,100);
    }
}