（1）建立配置類代替配置檔案

package com.orzjiangxiaoyu.spring.util;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidPooledConnection;
import org.junit.Test;
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 javax.sql.DataSource;
import java.sql.SQLException;

/**
 * @author orz
 * @create 2020-08-18 22:50
 
 
*/
@Configuration//配置類
@ComponentScan(basePackages = "com.orzjiangxiaoyu")//元件掃描
@EnableTransactionManagement//開啟事務
public class TxConfig {

    //建立資料庫連線池
    @Bean
    public DruidDataSource getDruidDataSource()
    {
        DruidDataSource dataSource=new DruidDataSource();
        dataSource.setDriverClassName(
 
"com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/test?useUnicode\\=true&characterEncoding\\=utf-8");
        dataSource.setUsername("root");
        dataSource.setPassword("root");
        return dataSource;
    }

    //建立JdbcTemplate物件
    @Bean
    public JdbcTemplate getJdbcTemplate(DataSource dataSource)
    {
        //到ioc中根據型別找到dataSource
        JdbcTemplate jdbcTemplate=new JdbcTemplate();

        //注入dataSoure
        jdbcTemplate.setDataSource(dataSource);

        return jdbcTemplate;
    }

    //建立事務管理器物件
    @Bean
    public DataSourceTransactionManager getDataSourceTransactionManager(DataSource dataSource)
    {
        DataSourceTransactionManager dataSourceTransactionManager=new DataSourceTransactionManager();
        dataSourceTransactionManager.setDataSource(dataSource);
        return dataSourceTransactionManager;
    }



}

package com.orzjiangxiaoyu.spring.service;

import com.orzjiangxiaoyu.spring.dao.BankDao;
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;

/**
 * @author orz
 * @create 2020-08-18 16:32
 */
@Service
@Transactional
public class BankService {

    @Autowired
    private BankDao bankDao;

    //轉賬方法




    //宣告式
    public void accountMoney()
    {
        //少錢操作
        bankDao.reduceMoney();

        //手動丟擲異常
        System.out.println(1/0);

        //多錢操作
        bankDao.addMoney();
    }


}

測試

package com.orzjiangxiaoyu.spring.testdemo;

import com.orzjiangxiaoyu.spring.service.BankService;
import com.orzjiangxiaoyu.spring.util.TxConfig;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * @author orz
 * @create 2020-08-18 23:04
 */
public class Test2 {
    @Test
    public void test1()
    {
        ApplicationContext context=new AnnotationConfigApplicationContext(TxConfig.class);
        BankService bankService = context.getBean("bankService", BankService.class);
        bankService.accountMoney();
    }
}