日期的循环

电玩女神 2022-05-11 11:18 125阅读 0赞

/**
     *
     *  文 件 名: AccountDate.java
     * 
     */
    package com.ihealthtek.jbagent.util;
    import java.text.DecimalFormat;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    
    public class AccountDate {
    
        private static transient int gregorianCutoverYear = 1582;
    
        /** 闰年中每月天数 */
        private static final int[] DAYS_P_MONTH_LY= {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    
        /** 非闰年中每月天数 */
        private static final int[] DAYS_P_MONTH_CY= {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    
        /** 代表数组里的年、月、日 */
        private static final int Y = 0, M = 1, D = 2;
    
        /**
         * 将代表日期的字符串分割为代表年月日的整形数组
         * @param date
         * @return
         */
        public static int[] splitYMD(String date){
            date = date.replace("-", "");
            int[] ymd = {0, 0, 0};
            ymd[Y] = Integer.parseInt(date.substring(0, 4));
            ymd[M] = Integer.parseInt(date.substring(4, 6));
            ymd[D] = Integer.parseInt(date.substring(6, 8));
            return ymd;
        }
    
        /**
         * 检查传入的参数代表的年份是否为闰年
         * @param year
         * @return
         */
        public static boolean isLeapYear(int year) {
            return year >= gregorianCutoverYear ?
                    ((year%4 == 0) && ((year%100 != 0) || (year%400 == 0))) : (year%4 == 0);
        }
    
        /**
         * 日期加1天
         * @param year
         * @param month
         * @param day
         * @return
         */
        private static int[] addOneDay(int year, int month, int day){
            if(isLeapYear( year )){
                day++;
                if( day > DAYS_P_MONTH_LY[month -1 ] ){
                    month++;
                    if(month > 12){
                        year++;
                        month = 1;
                    }
                    day = 1;
                }
            }else{
                day++;
                if( day > DAYS_P_MONTH_CY[month -1 ] ){
                    month++;
                    if(month > 12){
                        year++;
                        month = 1;
                    }
                    day = 1;
                }
            }
            int[] ymd = {year, month, day};
            return ymd;
        }
    
        /**
         * 将不足两位的月份或日期补足为两位
         * @param decimal
         * @return
         */
        public static String formatMonthDay(int decimal){
            DecimalFormat df = new DecimalFormat("00");
            return df.format( decimal );
        }
    
        /**
         * 将不足四位的年份补足为四位
         * @param decimal
         * @return
         */
        public static String formatYear(int decimal){
            DecimalFormat df = new DecimalFormat("0000");
            return df.format( decimal );
        }
    
        /**
         * 计算两个日期之间相隔的天数
         * @param begin
         * @param end
         * @return
         * @throws ParseException
         */
        public static long countDay(String begin,String end){
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            Date beginDate , endDate;
            long day = 0;
            try {
                beginDate= format.parse(begin);
                endDate=  format.parse(end);
                day=(endDate.getTime()-beginDate.getTime())/(24*60*60*1000);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            return day;
        }
    
        /**
         * 以循环的方式计算日期
         * @param beginDate endDate
         * @param days
         * @return
         */
        public static List<String> getEveryday(String beginDate , String endDate){
            long days = countDay(beginDate, endDate);
            int[] ymd = splitYMD( beginDate );
            List<String> everyDays = new ArrayList<String>();
            everyDays.add(beginDate);
            for(int i = 0; i < days; i++){
                ymd = addOneDay(ymd[Y], ymd[M], ymd[D]);
                everyDays.add(formatYear(ymd[Y])+"-"+formatMonthDay(ymd[M])+"-"+formatMonthDay(ymd[D]));
            }
            return everyDays;
        }
    
        public static void main(String[] args) {
            List<String> list = AccountDate.getEveryday("2008-08-29", "2008-09-02");
            for (String result : list) {
                System.out.println(result);
            }
        }
    
    }

运行结果如下：

2008-08-29  
2008-08-30  
2008-08-31  
2008-09-01  
2008-09-02