Spring @Scheduled定时任务的fixedRate,fixedDelay,cron的作用和不同

import java.text.DateFormat;  
import java.text.SimpleDateFormat;  
import java.util.Date;  
  
  
import org.springframework.scheduling.annotation.Scheduled;  
import org.springframework.stereotype.Component;  
  
  
@Component  
public class MyProcessor{  
      
    DateFormat sdf = new SimpleDateFormat("HH:mm:ss");  
      
    int[] delays = new int[]{8,3,6,2,2};  
    int index = 0;  
      
    @Scheduled(cron = "0/5 * * * * ?}")  
    public void process() {  
        try {  
            if(index > delays.length - 1){  
                if(index == delays.length){  
                    System.out.println("---------- test end at " + sdf.format(new Date()) + " ---------");  
                }  
                index ++;  
                return;  
            }else{  
                System.out.println(index + ":start run at" + sdf.format(new Date()));  
            }  
            Thread.sleep(delays[index] * 1000);  
            System.out.println(index + ":end run at " + sdf.format(new Date()));  
            index ++;   
        } catch (InterruptedException e) {  
            e.printStackTrace();  
        }  
    }  
}