Spring Boot 02 EnvironmentPostProcessor接口

EnvironmentPostProcessor是Spring Boot的一个拓展接口，我们可以通过这个接口来添加配置文件。

可以通过http等方式构成一个Properties，实现统一的管理配置文件。

这里只是简单的实现在文件管理下的配置文件。

这是源码的解释，说明了该接口的实现类要在classpath：META-INT/spring.factories里面注册

Allows for customization of the application's {@link Environment} prior to theapplication context being refreshed.<p> EnvironmentPostProcessor implementations have to be registered in{@code META-INF/spring.factories}, using the fully qualified name of this class as the key. <p> {@code EnvironmentPostProcessor} processors are encouraged to detect whether Spring's {@link org.springframework.core.Ordered Ordered} interface has been implemented or if the @{@link org.springframework.core.annotation.Order Order} annotation is present and to sort instances accordingly if so prior to invocation.

实现类MyEnvironmentPostProcessor

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;@Componentpublic class MyEnvironmentPostProcessor implements EnvironmentPostProcessor {@Overridepublic void postProcessEnvironment(ConfigurableEnvironment environment,SpringApplication application) {System.out.println("1");Properties properties=null;try{properties =new Properties();properties.load(new FileInputStream("E:/SpringBoot/application1.properties"));PropertiesPropertySource  propertySource =new PropertiesPropertySource("ds", properties);environment.getPropertySources().addLast(propertySource);}catch(Exception e){e.printStackTrace();}}}

spring.factories

org.springframework.boot.env.EnvironmentPostProcessor=com.springboot.www.config.MyEnvironmentPostProcessor