1.TxConfig

package com.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;

@Configuration
@ComponentScan("com.demo")
@EnableTransactionManagement
public class TxConfig {
    @Bean
    public DruidDataSource getDruidDataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://203.195.254.63:3306/mytest");
        dataSource.setUsername("myTest");
        dataSource.setPassword("jx22hmyDtzfHHtLy");
        return dataSource;
    }
    @Bean
    public JdbcTemplate getJdbcTemplate(DruidDataSource dataSource){
        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        jdbcTemplate.setDataSource(dataSource);
        return jdbcTemplate;
    }
    @Bean
    public DataSourceTransactionManager getDataSourceTransactionManager(DruidDataSource dataSource){
        DataSourceTransactionManager manager = new DataSourceTransactionManager();
        manager.setDataSource(dataSource);
        return manager;
    }
}

2.UserService

package com.demo.service;

import com.demo.dao.UserDao;
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;

@Service
@Transactional(propagation = Propagation.REQUIRED,isolation = Isolation.REPEATABLE_READ)
public class UserService {
    @Autowired
    private UserDao userDao;
    public void account(){
        userDao.addMoney();
        int a = 10/0;
        userDao.reduceMoney();
    }
}