spring 提供的配置文件动态扩展入口,通过扩展这个接口可以对spring 进行个性化的配置

    1. /**
    2.  * Allows for customization of the application's {@link Environment} prior to the
    3.  * application context being refreshed.
    4.  * <p>
    5.  * EnvironmentPostProcessor implementations have to be registered in
    6.  * {@code META-INF/spring.factories}, using the fully qualified name of this class as the
    7.  * key.
    8.  * <p>
    9.  * {@code EnvironmentPostProcessor} processors are encouraged to detect whether Spring's
    10.  * {@link org.springframework.core.Ordered Ordered} interface has been implemented or if
    11.  * the @{@link org.springframework.core.annotation.Order Order} annotation is present and
    12.  * to sort instances accordingly if so prior to invocation.
    13.  *
    14.  * @author Andy Wilkinson
    15.  * @author Stephane Nicoll
    16.  * @since 1.3.0
    17.  */
    18. @FunctionalInterface
    19. public interface EnvironmentPostProcessor {
    21.     /**
    22.      * Post-process the given {@code environment}.
    23.      * @param environment the environment to post-process
    24.      * @param application the application to which the environment belongs
    25.      */
    26.     void postProcessEnvironment(ConfigurableEnvironment environment,
    27.             SpringApplication application);
    29. }

    使用方法：

    1. 一个类实现EnvironmentPostProcessor接口，进行配置;
    2. resources 文件下建一个 META-INF 文件夹，里面建一个application.properties 文件，里面配置接口的全类名即可; ```java package com.alibaba.demo.process;

    import org.springframework.boot.SpringApplication; import org.springframework.boot.env.EnvironmentPostProcessor; import org.springframework.core.env.ConfigurableEnvironment; import org.springframework.core.env.MapPropertySource;

    import java.util.HashMap; import java.util.Map;

    /**

    • @author demon

    • @date 2020/12/11 15:41 */ public class EnvironmentProcessor implements EnvironmentPostProcessor {

      @Override public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {

      1.  Map<String, Object> paramMap = new HashMap<>(4);
      2.  paramMap.put("server.port","6666");
      3.  MapPropertySource mapPropertySource = new MapPropertySource("demon", paramMap);
      4.  environment.getPropertySources().addLast(mapPropertySource);

      }

    }

    1. application.properties  文件
    2. ```java
    3. org.springframework.boot.env.EnvironmentPostProcessor=com.alibaba.demo.process.EnvironmentProcessor

    结果
    image.png