package com.boot.config;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import javax.sql.DataSource;

public class Main {

    public static void main(String[] args) {

        AnnotationConfigApplicationContext context=new AnnotationConfigApplicationContext(SpringConfig.class);

        DataSource boneCPDataSource = (DataSource) context.getBean("boneCPDataSource");

        //UserService userService = context.getBean(UserService.class);

        //List<User> users = userService.queryUserList();

        //System.out.println(users);

        context.close();

    }

}

package com.boot.config;

import com.jolbox.bonecp.BoneCPDataSource;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.PropertySource;

//配置注解

@Configuration

//扫描

@ComponentScan(basePackages = "com.boot.config")

@PropertySource(value = {"classpath:jdbc.properties"},ignoreResourceNotFound=true)

public class SpringConfig {

    @Value("${jdbc.driverClassName}")

    private String driverClassName;

    @Value("${jdbc.url}")

    private String url;

    @Value("${jdbc.username}")

    private String username;

    @Value("${jdbc.password}")

    private String password;

    //@Bean  //相当于xml配置文件的bean注解   初始化userDao

    //public UserDAO getUserDao(){

    //    return new UserDAO();//返回对象

    //}

    //bean默认id为方法名

    @Bean(destroyMethod="close")

    public BoneCPDataSource boneCPDataSource(){

        //配置数据库连接池对象

        BoneCPDataSource boneCPDataSource=new BoneCPDataSource();

        boneCPDataSource.setDriverClass(driverClassName);

        boneCPDataSource.setUsername(username);

        boneCPDataSource.setPassword(password);

        boneCPDataSource.setJdbcUrl(url);

        return boneCPDataSource;

    }

}

jdbc.driverClassName=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://127.0.0.1:3306/mybatis

jdbc.username=root

jdbc.password=