SpringBoot 启动源码解析系列六：执行启动方法

2018-01-02

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

    try {
        ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
        ConfigurableEnvironment environment = this.prepareEnvironment(listeners, applicationArguments);
        Banner printedBanner = this.printBanner(environment);
        context = this.createApplicationContext();
        new FailureAnalyzers(context);
        this.prepareContext(context, environment, listeners, applicationArguments, printedBanner);
        this.refreshContext(context);
        this.afterRefresh(context, applicationArguments);
        listeners.finished(context, (Throwable)null);
        stopWatch.stop();
        if (this.logStartupInfo) {
            (new StartupInfoLogger(this.mainApplicationClass)).logStarted(this.getApplicationLog(), stopWatch);
        }

        return context;
    } catch (Throwable var9) {
        this.handleRunFailure(context, listeners, (FailureAnalyzers)analyzers, var9);
        throw new IllegalStateException(var9);
    }
}

核心步骤一：

1 2	SpringApplicationRunListeners listeners = this.getRunListeners(args); listeners.starting();

核心步骤二：

1	ConfigurableEnvironment environment = this.prepareEnvironment(listeners, applicationArguments);

核心步骤三：

1	context = this.createApplicationContext();

核心步骤四：

1	this.prepareContext(context, environment, listeners, applicationArguments, printedBanner);

核心步骤五：

1	this.refreshContext(context);

核心步骤六：

1	this.afterRefresh(context, applicationArguments);

核心步骤七：

1	listeners.finished(context, (Throwable)null);