spring boot启动源码分析 afterRefresh

    protected void afterRefresh(ConfigurableApplicationContext context,
            ApplicationArguments args) {
        callRunners(context, args);
    }

    private void callRunners(ApplicationContext context, ApplicationArguments args) {
        List<Object> runners = new ArrayList<Object>();
        runners.addAll(context.getBeansOfType(ApplicationRunner.class).values());
        runners.addAll(context.getBeansOfType(CommandLineRunner.class).values());
        AnnotationAwareOrderComparator.sort(runners);
        for (Object runner : new LinkedHashSet<Object>(runners)) {
            if (runner instanceof ApplicationRunner) {
                callRunner((ApplicationRunner) runner, args);
            }
            if (runner instanceof CommandLineRunner) {
                callRunner((CommandLineRunner) runner, args);
            }
        }
    }

    private void callRunner(ApplicationRunner runner, ApplicationArguments args) {
        try {
            (runner).run(args);
        }
        catch (Exception ex) {
            throw new IllegalStateException("Failed to execute ApplicationRunner", ex);
        }
    }

上下文刷新结束后，可以实现ApplicationRunner或者CommandLineRunner接口来实现上下文成功初始化后的一些操作。

最终调用

listeners.finished(context, null);

通知所有监听器，上下文初始化结束。

applicationrunner commandlinerunner两种runner除了参数类型不一样，其他的没有区别，执行顺序也是一起排序使用order控制。使用的排序规则是AnnotationAwareOrderComparator。