SpringBoot2 application.properties方式加载配置文件

application.properties

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

　　

JdbcProperties.java

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;
}

　　

JdbcConfig.java

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;
    }
}