运行进程在后台使用 spring 启动

Question

如何使用 Spring 启动运行一些后台进程？这是我需要的示例：

@SpringBootApplication
public class SpringMySqlApplication {

    @Autowired
    AppUsersRepo appRepo;

    public static void main(String[] args) {
        SpringApplication.run(SpringMySqlApplication.class, args);

        while (true) {
            Date date = new Date();
            System.out.println(date.toString());
            try {
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

Answer 1

您可以使用异步行为。当您调用该方法时，当前线程确实在等待它完成。

像这样创建一个可配置的class。

@Configuration
@EnableAsync
public class AsyncConfiguration {

    @Bean(name = "threadPoolTaskExecutor")
    public Executor threadPoolTaskExecutor() {
        return new ThreadPoolTaskExecutor();
    }
}

然后在一个方法中使用：

@Async("threadPoolTaskExecutor")
public void someAsyncMethod(...) {}

查看 spring documentation 了解更多信息

Answer 2

您可以只使用@Scheduled-Annotation。

@Scheduled(fixedRate = 5000)
public void reportCurrentTime() {
     log.info("The time is now " + System.currentTimeMillis()));
}

https://spring.io/guides/gs/scheduling-tasks/:

The Scheduled annotation defines when a particular method runs. NOTE: This example uses fixedRate, which specifies the interval between method invocations measured from the start time of each invocation.

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