org.springframework.boot.SpringApplication
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| private ConfigurableEnvironment prepareEnvironment(SpringApplicationRunListeners listeners,
ApplicationArguments applicationArguments) {
ConfigurableEnvironment environment = getOrCreateEnvironment();
configureEnvironment(environment, applicationArguments.getSourceArgs());
ConfigurationPropertySources.attach(environment);
listeners.environmentPrepared(environment);
bindToSpringApplication(environment);
if (!this.isCustomEnvironment) {
environment = new EnvironmentConverter(getClassLoader()).convertEnvironmentIfNecessary(environment,
deduceEnvironmentClass());
}
ConfigurationPropertySources.attach(environment);
return environment;
}
|
EnvironmentPostProcessor 接口的实现类定义在 META-INF/spring.factories 文件中, Spring Boot 应用启动时， 调用上面的 prepareEnvironment 方法时，会发布 ApplicationEnvironmentPreparedEvent 事件，相应的监听器类 ConfigFileApplicationListener 监听到改时间后，会通过类似于 java SPI 机制加载所有指定 EnvironmentPostProcessor 接口的实现类，并且初始化，调用内部方法 postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application)，实现自定义 spring 的 Environment
spring.factories 机制
META-INF