springboot源码解读

public static void main(String[] args) {
    ApplicationContext app = SpringApplication.run(BeikbankApplication.class, args);
}

public static ConfigurableApplicationContext run(Object source, String... args) {
    return run(new Object[] { source }, args);
}

public static ConfigurableApplicationContext run(Object[] sources, String[] args) {
    return new SpringApplication(sources).run(args);
}

public ConfigurableApplicationContext run(String... args) {
    //秒表计时器，用来记录整个容器启动时间
    StopWatch stopWatch = new StopWatch();
    stopWatch.start();
    ConfigurableApplicationContext context = null;
    FailureAnalyzers analyzers = null;
    //配置headless系统属性
    configureHeadlessProperty();
    //获取springbootApplication注解的类信息开启监听
    SpringApplicationRunListeners listeners = getRunListeners(args);
    listeners.starting();
    try {
        //应用参数初始化
        ApplicationArguments applicationArguments = new DefaultApplicationArguments(
                args);
        //环境变量初始化
        ConfigurableEnvironment environment = prepareEnvironment(listeners,
                applicationArguments);
        //打印banner，就是spring图形
        Banner printedBanner = printBanner(environment);
        //创建应用上下文，默认会得到AnnotationConfigEmbeddedWebApplicationContext
        context = createApplicationContext();
        //反射加载实例化FailureAnalyzer实现类
        analyzers = new FailureAnalyzers(context);
        //上下文环境准备
        prepareContext(context, environment, listeners, applicationArguments,
                printedBanner);
        //主要的IOC过程，也是springMVC的主要过程，进行bean的相关接口初始化和bean实例化
        refreshContext(context);
        //到上一步tomcat已经启动完成了，这里算是springboot的扩展接口，可以自己实现ApplicationRunner或CommandLineRunner接口，在这里进行实例化开始运行
        afterRefresh(context, applicationArguments);
        //发布事件监听器
        listeners.finished(context, null);
        //停止计时
        stopWatch.stop();
        if (this.logStartupInfo) {
            new StartupInfoLogger(this.mainApplicationClass)
                    .logStarted(getApplicationLog(), stopWatch);
        }
        return context;
    }
    catch (Throwable ex) {
        handleRunFailure(context, listeners, analyzers, ex);
        throw new IllegalStateException(ex);
    }
}