如何从主应用程序调用服务以调用Spring Boot?

问题描述：

我正在构建一个Spring Boot应用程序，它将从命令行调用.我将一些参数传递给应用程序，但在从此类中调用服务时遇到问题:

I'm building a Spring Boot application that will be called from command line. I will pass to application some parameters but I'm having problems to call a service from this class:

@SpringBootApplication
public class App{

    public static void main(String[] args) {

        SpringApplication.run(App.class, args);

        App app = new App();
        app.myMethod();    
    }

    @Autowired
    private MyService myService;

    private void myMethod(){
        myService.save();
    }
}

我正在尝试从主体内部调用方法，但出现错误:

I'm trying to call a method from inside the main but I'm getting the error:

Exception in thread "main" java.lang.NullPointerException
at com.ef.Parser.App.myMethod(Application.java:26)
at com.ef.Parser.App.main(Application.java:18)

答

您可以创建实现CommandLineRunner的类，并在应用启动后调用该类

you can create a class that implements CommandLineRunner and this will be invoked after the app will start

@Component
public class CommandLineAppStartupRunner implements CommandLineRunner {
    @Autowired
    private MyService myService;

    @Override
    public void run(String...args) throws Exception {
       myService.save();

    }
}

您可以在此处

如何从主应用程序调用服务以调用Spring Boot?

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