如何在spring中使用@scheduled注释

Question

I have to read time of a file(video) created and if the time of file is greater than 3 days i have to delete the files. For this i have used @scheduled annotation in spring. But when i run the application, that deletion code is not working. I have configured xmlns:task="http://www.springframework.org/schema/task" http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd <task:annotation-driven /> in spring xml file. It is showing schema reference 4:failed to read. So i have decided to use complete annotation. java version is 7 and spring version is 4.2.2. I have set cron expression at 4 PM and I ran application at 3.58 PM. Nothing executed. What am I missing. What is the best package(controller/service/secondary logic) to place this code. And I would also like to know How to implement DELETE method. This is my code for deleting videos

package com.test.logic;
import java.io.File;
import java.util.Date;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import com.sun.xml.internal.ws.developer.SchemaValidation;

@Component
@EnableScheduling
public class VideoDelete {
    @Scheduled(cron="* 1-15 16 * * * *")
    public void deleteVideo(){
    System.out.println("========> $$$$$$ scheduler method is executed $$$$$ <==========");
        long presentTime=System.currentTimeMillis();
        Date presentDate=new Date(presentTime);
        File file=new File("E://videorecording1");
        File[] fileList=file.listFiles();
        for (File files : fileList){
            if (files.isFile()){
                long filecreatedtime=files.lastModified();
                Date fileDate=new Date(filecreatedtime);
                long difference = presentDate.getTime() - fileDate.getTime();
                long hoursDifference = difference / (60 * 60 * 1000);
                if(hoursDifference >= 72)
                    files.delete();
            }
        }
}
}

Answer 1

Spring scheduler's cron allows only 6 kind of triggers.

From the official documentation:

A cron-like expression, extending the usual UN*X definition to include triggers * on the second as well as minute, hour, day of month, month and day of week.

To be able to support 7 trigger(including the YEAR) you have to use Quartz: https://www.quartz-scheduler.org/

In your current case try this:

(cron = "0 0 16 * * ?")

Answer 2

我认为你会更好地尝试使用cron表达式"*/10 * * * * *这基本上意味着方法将每10秒执行一次，没有时间/日期/日限制。这样你就会看到弹簧是否有任何问题配置本身或文件权限。

Answer 3

I got the solution. The reason is spring container is not recognizing VideoDelete class as a spring bean. So i have annotated it with @controller and now it is working fine.