Spring @Scheduled定时任务的fixedRate,fixedDelay,cron执行差异

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(); 
} 
} 
}