spring boot afterRefresh process

Disclaimer: This article is a blogger original article, shall not be reproduced without the bloggers allowed. https://blog.csdn.net/yj1499945/article/details/87184890

spring boot using 1.5.9

 private void callRunners(ApplicationContext context, ApplicationArguments args) {
        List<Object> runners = new ArrayList();
        runners.addAll(context.getBeansOfType(ApplicationRunner.class).values());
        runners.addAll(context.getBeansOfType(CommandLineRunner.class).values());
        AnnotationAwareOrderComparator.sort(runners);
        Iterator var4 = (new LinkedHashSet(runners)).iterator();

        while(var4.hasNext()) {
            Object runner = var4.next();
            if (runner instanceof ApplicationRunner) {
                this.callRunner((ApplicationRunner)runner, args);
            }

            if (runner instanceof CommandLineRunner) {
                this.callRunner((CommandLineRunner)runner, args);
            }
        }

    }

Can be seen here will find ApplicationRunner and CommandLineRunner implementation class, they can go run some operations in this process

Take a look at CommandLineRunner class

@Component
public class OtherOperation implements CommandLineRunner {

    @Override
    public void run(String... strings) throws Exception {

        System.out.println("qwe");

        for (String s : strings){
            System.out.println(s);
        }

    }

}

Roughly like this, he can get the parameters passed in and then you do some custom operations.

If I start the command java -jar xxx.jar username = xxx, then passed in parameter is username = xxx, you can do some operation on this parameter and so on.

Of course, with the command line parameters passed priority than .yml and .properties (avoid pit)