springboot启动配置原理之二(运行run方法)

public ConfigurableApplicationContext run(String... args) {
   StopWatch stopWatch = new StopWatch();
   stopWatch.start();
   ConfigurableApplicationContext context = null;
   FailureAnalyzers analyzers = null;
   configureHeadlessProperty();
    
   //获取SpringApplicationRunListeners;从类路径下META-INF/spring.factories
   SpringApplicationRunListeners listeners = getRunListeners(args);
    //回调所有的获取SpringApplicationRunListener.starting()方法
   listeners.starting();
   try {
       //封装命令行参数
      ApplicationArguments applicationArguments = new DefaultApplicationArguments(
            args);
      //准备环境
      ConfigurableEnvironment environment = prepareEnvironment(listeners,
            applicationArguments);
            //创建环境完成后回调SpringApplicationRunListener.environmentPrepared();表示环境准备完成
       
      Banner printedBanner = printBanner(environment);
       
       //创建ApplicationContext;决定创建web的ioc还是普通的ioc
      context = createApplicationContext();
       //异常报告
      analyzers = new FailureAnalyzers(context);
       //准备上下文环境;将environment保存到ioc中;而且applyInitializers();
       //applyInitializers():回调之前保存的所有的ApplicationContextInitializer的initialize方法
       //回调所有的SpringApplicationRunListener的contextPrepared();
       //prepareContext运行完成以后回调所有的 SpringApplicationRunListener的contextLoaded();
      prepareContext(context, environment, listeners, applicationArguments,
            printedBanner);
      
       //s刷新容器;ioc容器初始化(如果是web应用还会创建嵌入式的Tomcat);Spring注解版
       //扫描,创建,加载所有组件的地方;(配置类,组件,自动配置)
      refreshContext(context);
       //从ioc容器中获取所有的ApplicationRunner和CommandLineRunner进行回调
       //ApplicationRunner先回调,CommandLineRunner再回调
      afterRefresh(context, applicationArguments);
 
       //所有的SpringApplicationRunListener回调finished方法
      listeners.finished(context, null);
      stopWatch.stop();
      if (this.logStartupInfo) {
         new StartupInfoLogger(this.mainApplicationClass)
               .logStarted(getApplicationLog(), stopWatch);
      }
       //整个SpringBoot应用启动完成以后返回启动的ioc容器;
      return context;
   }
   catch (Throwable ex) {
      handleRunFailure(context, listeners, analyzers, ex);
      throw new IllegalStateException(ex);
   }
}

//获取SpringApplicationRunListeners;从类路径下META-INF/spring.factories

//回调所有的获取SpringApplicationRunListener.starting()方法

 //准备环境

//创建环境完成后回调SpringApplicationRunListener.environmentPrepared();表示环境准备完成

 //创建ApplicationContext;决定创建web的ioc还是普通的ioc

//准备上下文环境;将environment保存到ioc中;而且applyInitializers();
//applyInitializers():回调之前保存的所有的ApplicationContextInitializer的initialize方法
//回调所有的SpringApplicationRunListener的contextPrepared();
//prepareContext运行完成以后回调所有的 SpringApplicationRunListener的contextLoaded();

 
 

//从ioc容器中获取所有的ApplicationRunner和CommandLineRunner进行回调
//ApplicationRunner先回调,CommandLineRunner再回调

 
 //所有的SpringApplicationRunListener回调finished方法

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转载自www.cnblogs.com/MagicAsa/p/10745447.html