package com.spring4all.config;

import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Properties;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.PropertiesPropertySource;
import org.springframework.stereotype.Component;
/**
 * 使用EnvironmentPostProcessor加载外部配置资源
 * 1.实现EnvironmentPostProcessor接口,重写postProcessEnvironment方法
 * 2.在META-INF下创建spring.factories 
 * @author Bowin
 *
 */
@Component
public class MyEnvironmentPostProcessor  implements EnvironmentPostProcessor{

	@Override
	public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
		try(InputStream input = new FileInputStream("E:\\ds.properties")) {
			Properties properties = new Properties();
			properties.load(input);
			PropertiesPropertySource propertySource = new PropertiesPropertySource("ve", properties);
			environment.getPropertySources().addLast(propertySource);
			System.out.println("====加载外部配置文件完毕====");
		} catch (Exception e) {
			e.printStackTrace();
		}
				
	}

}

org.springframework.boot.env.EnvironmentPostProcessor=com.spring4all.config.MyEnvironmentPostProcessor

 外部配置文件：ds.properties

ds.url=111
ds.name=root
ds.password=123456
ds.driver=oracle

测试

package com.spring4all;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.ConfigurableEnvironment;
/**
 * 启动测试
 * @author Bowin
 *
 */
@SpringBootApplication
public class Application{

    public static void main(String[] args) {
        ConfigurableApplicationContext run = SpringApplication.run(Application.class, args);
        String property = run.getEnvironment().getProperty("ds.password");
        System.out.println(property);
        
    }

}