Shulou(Shulou.com)06/03 Report--

This article introduces to you what is the complete step of SpringBoot loading configuration file, the content is very detailed, interested friends can refer to it, hope to be helpful to you.

Where does SpringBoot start loading configuration files?

The entry for SpringBoot to load the configuration file is entered by the ApplicationEnvironmentPreparedEvent event, and SpringBoot will obtain the instance class of ApplicationListener through the spring.factories file in the constructor of SpringApplication:

Public SpringApplication (ResourceLoader resourceLoader, Class... PrimarySources) {... SetListeners ((Collection) getSpringFactoriesInstances (ApplicationListener.class));

There is a ConfigFileApplicationListener class in spring.factories that listens to ApplicationEnvironmentPreparedEvent and then loads the configuration file:

# Application Listenersorg.springframework.context.ApplicationListener= org.springframework.boot.context.config.ConfigFileApplicationListener...

Once you have the event and event handling class, you can find out where the event is sent, and you can figure out how SpringBoot loads the configuration file. SpringBoot initializes the SpringApplicationRunListeners class before starting. It implements the SpringApplicationRunListener interface and forwards the event:

Class SpringApplicationRunListeners {private final Log log; private final List listeners; SpringApplicationRunListeners (Log log, Collection)

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