以编程方式关闭spring boot应用程序

Question

如何在不终止VM的情况下以编程方式关闭一个spring boot应用程序？

在其他作品中，…的反义词是什么

new SpringApplication(Main.class).run(args);

Answer 1

最简单的方法是在需要启动关机的地方注入以下对象

ShutdownManager.java

import org.springframework.context.ApplicationContext;
import org.springframework.boot.SpringApplication;

@Component
class ShutdownManager {

    @Autowired
    private ApplicationContext appContext;

    /*
     * Invoke with `0` to indicate no error or different code to indicate
     * abnormal exit. es: shutdownManager.initiateShutdown(0);
     **/
    public void initiateShutdown(int returnCode){
        SpringApplication.exit(appContext, () -> returnCode);
    }
}

Answer 2

关闭SpringApplication基本上意味着关闭底层的ApplicationContext。SpringApplication#run（String...）方法将ApplicationContext作为ConfigurableApplicationContext。然后您可以自己close()。

例如,

@SpringBootApplication
public class Example {
    public static void main(String[] args) {
        ConfigurableApplicationContext ctx = SpringApplication.run(Example.class, args);
        // ...determine it's time to shut down...
        ctx.close();
    }
}

或者，您可以使用staticSpringApplication.Exit（ApplicationContext,ExitCodeGenerator...）帮助器方法来完成此操作。例如,

@SpringBootApplication
public class Example {
    public static void main(String[] args) {
        ConfigurableApplicationContext ctx = SpringApplication.run(Example.class, args);
        // ...determine it's time to stop...
        int exitCode = SpringApplication.exit(ctx, new ExitCodeGenerator() {
            @Override
            public int getExitCode() {
                // no errors
                return 0;
            }
        });

        // or shortened to
        // int exitCode = SpringApplication.exit(ctx, () -> 0);

        System.exit(exitCode);
    }
}