23.8 Using the ApplicationRunner or CommandLineRunner 实现ApplicationRunner 和CommandLineRunner

如果您需要在SpringApplication启动之后运行一些特定的代码，那么您可以实现ApplicationRunner或commandlinrun 接口。这两个接口都以相同的方式工作，并提供一个单独的运行方法，在springapplication.run(.)完成之前，它将被调用。

CommandLineRunner接口提供对应用程序参数的访问，作为一个简单的字符串数组，ApplicationRunner提供了ApplicationArguments。

执行顺序在SpringApplication启动之前，在大部分监听器之后。监听器可参考前面的文章。


ApplicationRunner实现

@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实现

@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());
    }

当有对个实现可以使用@Order进行排序执行