SpringApplicationRunListener 解析

SpringApplicationRunListener 作用

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SpringApplicationRunListener 可以监听springboot应用启动过程中的一些生命周期事件，并做一些处理

查看SpringApplicationRunListener 定义

/**
* Called immediately when the run method has first started. Can be used for very
* early initialization.
*/
void starting();
/**
* Called once the environment has been prepared, but before the
* {@link ApplicationContext} has been created.
* @param environment the environment
*/
void environmentPrepared(ConfigurableEnvironment environment);
/**
* Called once the {@link ApplicationContext} has been created and prepared, but
* before sources have been loaded.
* @param context the application context
*/
void contextPrepared(ConfigurableApplicationContext context);
/**
* Called once the application context has been loaded but before it has been
* refreshed.
* @param context the application context
*/
void contextLoaded(ConfigurableApplicationContext context);
/**
* Called immediately before the run method finishes.
* @param context the application context or null if a failure occurred before the
* context was created
* @param exception any run exception or null if run completed successfully.
*/
void finished(ConfigurableApplicationContext context, Throwable exception);

根据方法名可以看出对应springboot应用启动过程中的一些操作，比如

StopWatch stopWatch = new StopWatch();
stopWatch.start();
ConfigurableApplicationContext context = null;
FailureAnalyzers analyzers = null;
configureHeadlessProperty();
SpringApplicationRunListeners listeners = getRunListeners(args);
listeners.starting();

这是springboot启动的时候调用的方法，对应上面的接口中的方法
如果我们自己实现这个接口，要怎么做才能让springboot启动的时候加载呢？

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springboot启动的时候会在 MEAT/INF 下去找spring.factories文件
我们只需要将对应的实现类按照下面的格式配置好就行了

org.springframework.boot.SpringApplicationRunListener=com.springboot.MyApplicationRunListener

这样springboot会自动加载该实现类然后在触发事件的时候调用

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