1——创建配置类，代替xml配置文件

package 转账事务.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 javax.sql.DataSource;

@Configuration  //这个表示这个类是配置类
@ComponentScan(basePackages = "转账事务")   //开启组件扫描
@EnableTransactionManagement    //开启事务
public class Txconfig {

    //建立数据库连接池
    @Bean
    public DruidDataSource getDruidDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setDriverClassName("com.mysql.jdbc.Driver");
        druidDataSource.setUrl("jdbc:mysql://localhost:3306/user_db");
        druidDataSource.setUsername("root");
        druidDataSource.setPassword("root");
        return druidDataSource;
    }

    //创建JdbcTemplate对象
    @Bean
    public JdbcTemplate getjdbcTemplate(DataSource dataSource) {
        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        //注入dataSource
        jdbcTemplate.setDataSource(dataSource);
        return jdbcTemplate;
    }

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

        return dataSourceTransactionManager;
    }
}