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;
    }
}