23.8 using the applicationrunner or commandlinerunner to implement applicationrunner and commandlinerunner

If you need to be in SpringApplication Run some specific code after startup , Then you can achieve ApplicationRunner or commandlinrun Interface . Both interfaces work in the same way , And provide a separate operation method , stay springapplication.run(.) Before completion , It will be called .

CommandLineRunner Interface provides access to application parameters , As a simple string array ,ApplicationRunner Provides ApplicationArguments.

The order of execution is SpringApplication Before starting , After most listeners . The listener can refer to the previous article .


ApplicationRunner Realization

@SpringBootApplication
public class MyApplicationRunner {
    public static void main(String[] args) {
        SpringApplication application = new SpringApplication(Application.class);
        application.addListeners(new ApplicationListenerStarted());
        application.addListeners(new ApplicationListenerEnvironmentPrepared());
        application.addListeners(new ApplicationListenerPrepared());
        application.addListeners(new ApplicationListenerReadyEvent());
        application.addListeners(new ApplicationListenerFailed());
        application.run(args);
    }
}

@Order(2)
@Component
class MyApplicationRunner1 implements ApplicationRunner {
    @Override
    public void run(ApplicationArguments applicationArguments) throws Exception {
        StringBuffer sf =new StringBuffer("");
        for(String str :applicationArguments.getSourceArgs()){
            sf.append(str);
        }
        System.out.println("-------------------" + this.toString()+"----"+sf);
    }
}

@Order(1)
@Component
class MyApplicationRunner2 implements ApplicationRunner  {
    @Override
    public void run(ApplicationArguments applicationArguments) throws Exception {
        System.out.println("-------------------" + this.toString());
    }


}

CommandLineRunner Realization

@SpringBootApplication
public class MyCommandLineRunner {
    public static void main(String[] args) {
        String[] aa ={
  "0","1"};
        SpringApplication application = new SpringApplication(Application.class);
        application.addListeners(new ApplicationListenerStarted());
        application.addListeners(new ApplicationListenerEnvironmentPrepared());
        application.addListeners(new ApplicationListenerPrepared());
        application.addListeners(new ApplicationListenerReadyEvent());
        application.addListeners(new ApplicationListenerFailed());
        application.run(aa);
    }
}

@Order(2)
@Component
class MyCommandLineRunner1 implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        StringBuffer sf =new StringBuffer("");
        for(String str :args){
            sf.append(str);
        }
        System.out.println("-------------------" + this.toString()+ "---"+sf);

    }
}

@Order(1)
@Component
class MyCommandLineRunner2 implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        System.out.println("-------------------" + this.toString());
    }

When a pair of implementations can be used @Order Sort and execute