springboot run方法

    public ConfigurableApplicationContext run(String... args) {
//  用来测量时间
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();
//  创建ConfigurableApplicationContext环境
        ConfigurableApplicationContext context = null;
//创建数组用于异常报告的记录
        Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList<>();
  // Headless模式是在缺少显示屏、键盘或者鼠标是的系统配置
        configureHeadlessProperty();
//找到类路径下的META-INF/spring.factories下的所有ApplicationRunListeners，存入listeners数组里面
        SpringApplicationRunListeners listeners = getRunListeners(args);
//调用所有listener的starting方法，开启监听
        listeners.starting();
        try {
//封装命令行参数
            ApplicationArguments applicationArguments = new DefaultApplicationArguments(
                    args);
//创建IOC环境，既舞台背景的搭建，并将listener绑定到environment里面
            ConfigurableEnvironment environment = prepareEnvironment(listeners,
                    applicationArguments);
// 跳过搜索BeanInfo类
            configureIgnoreBeanInfo(environment);
//打印那个banner图案
            Banner printedBanner = printBanner(environment);
//创建ApplicationContext环境 既ioc容器
            context = createApplicationContext();
//找到类路径下的META-INF/spring.factories下的所有SpringBootExceptionReporter，存入listeners数组里面
            exceptionReporters = getSpringFactoriesInstances(
                    SpringBootExceptionReporter.class,
                    new Class[] { ConfigurableApplicationContext.class }, context);
//整合准备环境
            prepareContext(context, environment, listeners, applicationArguments,
                    printedBanner);
            refreshContext(context);
//一堆东西初始化，
            afterRefresh(context, applicationArguments);
//停止计时
            stopWatch.stop();
            if (this.logStartupInfo) {
                new StartupInfoLogger(this.mainApplicationClass)
                        .logStarted(getApplicationLog(), stopWatch);
            }
//开启监听器
            listeners.started(context);
//回调runner
            callRunners(context, applicationArguments);
        }
        catch (Throwable ex) {
            handleRunFailure(context, ex, exceptionReporters, listeners);
            throw new IllegalStateException(ex);
        }

        try {
            listeners.running(context);
        }
        catch (Throwable ex) {
            handleRunFailure(context, ex, exceptionReporters, null);
            throw new IllegalStateException(ex);
        }
        return context;
    }