前言
每次有人問起SpringBoot的啟動順序是不是又來翻博客了？其實只需要稍微查看Spring的源碼即可
步驟
-
SpringBoot的入口
org.springframework.boot.SpringApplication#run(String... args),
這里面實現了SpringBoot程序啟動的所有步驟 -
啟動事件的順序可以看監聽器的順序定義：
org.springframework.boot.SpringApplicationRunListeners或者org.springframework.boot.SpringApplicationRunListener
附錄
SpringBoot啟動順序
| 創建組件 | 發送事件 | 執行回調 |
|---|---|---|
| DefaultBootstrapContext | BootstrapRegistryInitializer#initialize | |
| SpringApplicationRunListeners | ||
| ApplicationStartingEvent | ||
| ConfigurableEnvironment | ||
| EnvironmentPreparedEvent | ||
| Banner | ||
| ConfigurableApplicationContext | ||
| ContextPreparedEvent | ||
| ConfigurableApplicationContext#refresh | ||
| ContextRefreshedEvent | ||
| ApplicationStartedEvent | ||
| AvailabilityChangeEvent (LivenessState.CORRECT) | ||
| ApplicationRunner#run | ||
| CommandLineRunner#run | ||
| ApplicationReadyEvent | ||
| AvailabilityChangeEvent (ReadinessState.ACCEPTING_TRAFFIC) |
提示：可通過ApplicationAvailabilityBean獲取到當前LivenessState和ReadinessState的值來判斷SpringBoot是否可以啟動
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