jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/leyou
jdbc.username=root
jdbc.password=123456

package com.caicia.config;


import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

import javax.sql.DataSource;

@Configuration
@EnableConfigurationProperties(jdbcProperties.class)
@PropertySource("classpath:jdbc.properties") 以前的配置方式
public class JdbcConfig {
//Spring boot 自带的Value注解
    @Value("${jdbc.url}")
    String url;
    @Value("${jdbc.driverClassName}")
    String dirclassname;
    @Value("${jdbc.username}")
    String username;
    @Value("${jdbc.password}")
    String password;
       @Bean
       public DataSource dataSource(){
           DruidDataSource dataSource = new DruidDataSource();
           dataSource.setDriverClassName(dirclassname);
           dataSource.setUsername(username);
           dataSource.setUrl(url);
           dataSource.setPassword(password);
           return dataSource;
       }


}