23.8 Using the ApplicationRunner or CommandLineRunner 实现ApplicationRunner 和CommandLineRunner

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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

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

CommandLineRunner实现

@SpringBootApplicationpublic 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)@Componentclass 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)@Componentclass 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

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