@EnableScheduling和@Scheduled(cron = "0 0 4 * * ?")，通過註解方式實現定時任務：

 1 import org.slf4j.Logger;
 2 import org.slf4j.LoggerFactory;
 3 import org.springframework.scheduling.annotation.EnableScheduling;
 4 import org.springframework.scheduling.annotation.Scheduled;
 5 import org.springframework.stereotype.Component;
 
 6 import java.io.File;
 7 import java.util.Date;
 8 
 9 /**
10  * Created by xxx on 2018-11-17.
11  */
12 @Component
13 @EnableScheduling
14 public class InitTaskConfig {
15     private static Logger logger = LoggerFactory.getLogger(InitTaskConfig.class);
16     /**
17      *設定定時任務
18      */
19     @Scheduled(cron = "0 0 4 * * ?")
 
20     public void deleteEmailFileTask(){
21         logger.info ("清空郵件附件臨時資料夾的定時任務開始");
22         Date date = new Date(System.currentTimeMillis() - 1000 * 60 * 60*4);
23         File folder = new File(ConfigUtils.get("pdpm.app.delegate.filepath"));
24         File[] files = folder.listFiles();
25         for
 
 (int i=0;i<files.length;i++){
26             File file = files[i];
27             if (new Date(file.lastModified()).before(date)){
28                 file.delete();
29             }
30         }
31         logger.info ("清空郵件附件臨時資料夾的定時任務結束");
32     }
33 }

本程式碼實現的了，每天4點，清空指定資料夾下，檔案的最後修改時間是上一工作日及之前的所有檔案~