Corn表达式与时间整点半点代码片

代码片
许进
代码片, 项目经验
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× 文章目录
  1. 1. Corn表达式
  2. 2. 判断时间是否整点或者半点执行

摘要:本文主要介绍了Corn表达式和判断时间是否半点或者整点执行的代码片。

Corn表达式

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String exp="0/3 * * * * ? ";
//判断表达式是否有效
boolean valid = CronExpression.isValidExpression(exp);
 
//使用CronExpression生成时间序列  
CronExpression cronExpression = new CronExpression(exp);
System.out.println(cronExpression.getNextValidTimeAfter(new Date()));
//使用CronSequenceGenerator生成时间序列
 CronSequenceGenerator cronSequenceGenerator = new CronSequenceGenerator(exp);
 Date nextTimePoint = cronSequenceGenerator.next(new Date());

判断时间是否整点或者半点执行

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package com.xxx.xxx.utils;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
/**
 * @Author xujin
 */
public class DateUtil {
    /**
     * 判断当前时间是半点
     * @return
     */
    public static Boolean judgeTimeIsHalf()
    {
        Boolean judgeTimeIsHalf=false;
        Date date = new Date();
        GregorianCalendar gc = new GregorianCalendar();
        gc.setTime(date);
        if (gc.get(gc.MINUTE)==30)
        {
            judgeTimeIsHalf= true;
        }
        return judgeTimeIsHalf;
    }
    /**
     * 判断当前时间是半点
     * @return
     */
    public static boolean judgeTimeIsWhole()
    {
        Boolean judgeTimeIsWhole=false;
        Date date = new Date();
        GregorianCalendar gc = new GregorianCalendar();
        gc.setTime(date);
        if ( gc.get(gc.MINUTE)==0 )
        {
            judgeTimeIsWhole= true;
        }
       return judgeTimeIsWhole;
    }
    public static int getMinute()
    {
        Date date = new Date();
        GregorianCalendar gc = new GregorianCalendar();
        gc.setTime(date);
        return gc.get(gc.MINUTE);
    }
    public static boolean quarztTime(int h,int m)
    {
        Boolean isQuarztTime=false;
        Date date = new Date();
        GregorianCalendar gc = new GregorianCalendar();
        gc.setTime(date);
        if((gc.get(gc.HOUR_OF_DAY)==h&&gc.get(gc.MINUTE)==m))
        {
            isQuarztTime= true;
        }
        return isQuarztTime;
    }
    public static String getHourAndMinute()
    {
        Date date = new Date();
        GregorianCalendar gc = new GregorianCalendar();
        gc.setTime(date);
        String hour=String.valueOf(gc.get(gc.HOUR_OF_DAY));
        String minute=String.valueOf(gc.get(gc.MINUTE));
        return hour+minute;
    }
    
    public static void main(String[] args)
    {
        System.out.println(getHourAndMinute());
        Calendar calendar=Calendar.getInstance();
        System.out.println(
            "现在是："+
                calendar.get(GregorianCalendar.YEAR)+"年"+
                (calendar.get(GregorianCalendar.MONTH)+1)+"月"+
                calendar.get(GregorianCalendar.DAY_OF_MONTH)+"日"+
                calendar.get(GregorianCalendar.HOUR)+"时"+
                calendar.get(GregorianCalendar.MINUTE)+"分"+
                calendar.get(GregorianCalendar.SECOND)+"秒"
        );
    }
}
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