完全注解开发

1、创建配置类，使用配置类替代xml配置文件

测试

package com.atguigu.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;
/**
 * @author Dxkstart
 * @create 2021-10-30-19:29
 */
@Configuration
@ComponentScan(basePackages = "com.atguigu")  //组件扫描
@EnableTransactionManagement //开启事务
public class TxConfig {
    //创建数据库连接池
    @Bean
    public DruidDataSource getDruidDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setDriverClassName("com.mysql.jdbc.Driver");
        druidDataSource.setUrl("jdbc:mysql:///user_db?characterEncoding=utf-8");
        druidDataSource.setUsername("root");
        druidDataSource.setPassword("abc123");
        return druidDataSource;
    }
    //创建JdbcTemplate对象
    @Bean
    public JdbcTemplate getJdbcTemplate(DruidDataSource druidDataSource){
        //到IOC容器中根据类型找到dataSource
        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        //注入dataSource
        jdbcTemplate.setDataSource(druidDataSource);
        return jdbcTemplate;
    }
    //创建事务管理器
    @Bean
    public DataSourceTransactionManager getDataSourceTransactionManager(DruidDataSource druidDataSource){
        DataSourceTransactionManager transactionManager = new DataSourceTransactionManager();
        transactionManager.setDataSource(druidDataSource);
        return transactionManager;
    }
}