玩转springboot之xxxRunner接口使用

Runner使用

如果需要在SpringApplication启动后执行一些逻辑，可以使用ApplicationRunner或CommandLineRunner接口，这两个接口都是只有一个run方法

public interface ApplicationRunner {

   void run(ApplicationArguments args) throws Exception;

}

public interface CommandLineRunner {

  
   void run(String... args) throws Exception;

}

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实现

@Component
public class CodeReview implements ApplicationRunner {

    @Override
    public void run(ApplicationArguments args) throws Exception {
    // 业务逻辑
  }

执行位置

该实现类是在SpringApplication.run方法最后进行执行的

afterRefresh(context, applicationArguments);


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);
            }
        }
    }

https://zhhll.icu/2022/框架/springboot/基础/16.Runner使用/

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