jdbc.driverClassName=com.mysql.jdbc.Driver

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

jdbc.username=root

jdbc.password=

package cn.itcast.config;

import lombok.Data;

import org.springframework.boot.context.properties.ConfigurationProperties;

//注解配置文件属性

@ConfigurationProperties(prefix = "jdbc")

//get和set方法

@Data

public class JdbcProperties {

    private String url;

    private String driverClassName;

    private String username;

    private String password;

}

package cn.itcast.config;

import com.alibaba.druid.pool.DruidDataSource;

import org.springframework.boot.context.properties.EnableConfigurationProperties;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

//配置文件注解

@Configuration

@EnableConfigurationProperties(JdbcProperties.class)

public class JdbcConfig {

    @Bean

    public DataSource dataSource(JdbcProperties properties){

        DruidDataSource druidDataSource = new DruidDataSource();

        druidDataSource.setDriverClassName(properties.getDriverClassName());

        druidDataSource.setUrl(properties.getUrl());

        druidDataSource.setUsername(properties.getUsername());

        druidDataSource.setPassword(properties.getPassword());

        return druidDataSource;

    }

}