计算指定周几的天数的数量例如周1有几天

「爱情、让人受尽委屈。」 2024-03-16 13:16 49阅读 0赞

package com.example.card.controller;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.*;
    
    public class w {
    
    
    //    /**
    //     * citycode : []
    //     * adcode : 410000
    //     * level : province
    //     * center : 113.753094,34.767052
    //     * name : 河南省
    //     */
    //
    //    private String citycode;
    //    private String adcode;
    //    private String level;
    //    private String center;
    //    private String name;
    
        public static void main(String[] args) {
            /*
            2023-06-16
            2023-07-16
            2023-08-16
            2023-09-16
             */
            //String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
            String[] weekDays = {"星期二", "星期三", "星期四", "星期五"};
            List<String> weekList = Arrays.asList(weekDays);
            String timeStart = "2023-06-16";
            String timeEnd = "2024-12-22";
            //String[] dayArr = new String[]{"16","17","18","19","20","21","22"};
            String[] dayArr = new String[]{"2","10","18","25"};
            List<String> dayList = Arrays.asList(dayArr);
    
            List<String> timeList = getTwoDaysDayDes(timeStart, timeEnd);
            List<String> timeList2 = getMonthBetweenDate(timeStart, timeEnd);//2023-06 2023-07 2023-08
            List<DayCount> dayCountList = new ArrayList<>();
            for(String day:dayList) {
                int count = 0;
                for (String time : timeList2) {
                    String dayTime = time + "-" + day;
                    String week = dateToWeek(dayTime);
                    if (weekList.contains(week)) {
                        count++;
                    }
                }
                DayCount dayCount = new DayCount();
                dayCount.setKey(day);
                dayCount.setValue(count+"");
                dayCountList.add(dayCount);
            }
            for (DayCount temp :dayCountList) {
    
                System.out.println(temp.getKey() + ": " + temp.getValue());
            }
            System.out.println();
    
    
        }
    
        private static List<String> getTwoDaysDayDes(String startDate, String endDate) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            List<String> dateList = new ArrayList<>();
            try {
                Date dateOne = sdf.parse(startDate);
                Date dateTwo = sdf.parse(endDate);
                Calendar calendar = Calendar.getInstance();
                calendar.setTime(dateOne);
                dateList.add(startDate);
                while (dateTwo.after(calendar.getTime())) {
                    calendar.add(Calendar.DAY_OF_MONTH, 1);
                    dateList.add(sdf.format(calendar.getTime()));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return dateList;
        }
    
        /**
         * 获取两个日期之间的所有月份 (年月)
         *
         * @param startTime
         * @param endTime
         * @return：list
         */
        public static List<String> getMonthBetweenDate(String startTime, String endTime) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            // 声明保存日期集合
            List<String> list = new ArrayList<>();
            try {
                // 转化成日期类型
                Date startDate = sdf.parse(startTime);
                Date endDate = sdf.parse(endTime);
                //用Calendar 进行日期比较判断
                Calendar calendar = Calendar.getInstance();
                while (startDate.getTime() <= endDate.getTime()) {
                    // 把日期添加到集合
                    list.add(sdf.format(startDate));
                    // 设置日期
                    calendar.setTime(startDate);
                    //把月数增加 1
                    calendar.add(Calendar.MONTH, 1);
                    // 获取增加后的日期
                    startDate = calendar.getTime();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return list;
        }
    
    
    
            /**
             * 根据日期获取 星期
             *
             * @param datetime
             * @return
             */
            public static String dateToWeek(String datetime) {
    
                SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");
                String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
                Calendar cal = Calendar.getInstance();
                Date date;
                try {
                    date = f.parse(datetime);
                    cal.setTime(date);
                } catch (ParseException e) {
                    e.printStackTrace();
                }
                //一周的第几天
                int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
                if (w < 0)
                    w = 0;
                return weekDays[w];
            }
    
    
    }