Time to calculate cron expression based on cronsequencegenerator

Hello everyone , I meet you again , I'm your friend, Quan Jun .

Spring Provides CronSequenceGenerator Class for calculation cron The specific time point of the expression next Method （Spring3.2 edition ） and cron Is it legal isValidExpression Method （Spring4.3 edition ）.

Practical examples ：

package construct;

import org.springframework.scheduling.support.CronSequenceGenerator;

import java.util.Date;

/**
 * Created by zhangzh on 2017/1/18.
 */
public class CronSequenceGeneratorTest {

    public static void main(String[] args) {

        String cron = "0 */5 * * * ?"; // Every five minutes 

        CronSequenceGenerator cronSequenceGenerator = new CronSequenceGenerator(cron);

        Date currentTime = new Date();

        System.out.println("currentTime: " + currentTime);

        Date nextTimePoint = cronSequenceGenerator.next(currentTime); // currentTime To calculate the start time of the next time point 
        System.out.println("nextTimePoint: " + nextTimePoint);

        Date nextNextTimePoint = cronSequenceGenerator.next(nextTimePoint);

        System.out.println("nextNextTimePoint: " + nextNextTimePoint);
    }
}

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Output results :

currentTime: Wed Jan 18 19:45:25 CST 2017
nextTimePoint: Wed Jan 18 19:50:00 CST 2017
nextNextTimePoint: Wed Jan 18 19:55:00 CST 2017

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see , Easy ！

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