文章目录

• 前言
• 一、pandas是什么？
• 二、使用步骤
  • 1.引入库
  • 2.读入数据
• 总结

前言

统计图中周，月，年报表

一、本周日期集合

    public static List<String> getWeekDateList() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        // 设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
        cal.setFirstDayOfWeek(Calendar.MONDAY);
        // 获得当前日期是一个星期的第几天
        int dayWeek = cal.get(Calendar.DAY_OF_WEEK);
        if (dayWeek == 1) {
            dayWeek = 8;
        }
        // 根据日历的规则，给当前日期减去星期几与一个星期第一天的差值
        cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - dayWeek);
        Date mondayDate = cal.getTime();

        cal.add(Calendar.DATE, 4 + cal.getFirstDayOfWeek());
        Date sundayDate = cal.getTime();

        List lDate = new ArrayList();
        lDate.add(format.format(mondayDate));
        Calendar calBegin = Calendar.getInstance();
        // 使用给定的 Date 设置此 Calendar 的时间
        calBegin.setTime(mondayDate);
        Calendar calEnd = Calendar.getInstance();
        // 使用给定的 Date 设置此 Calendar 的时间
        calEnd.setTime(sundayDate);
        //测试此日期是否在指定日期之后
        while (sundayDate.after(calBegin.getTime())) {
            // 根据日历的规则，为给定的日历字段添加或减去指定的时间量
            calBegin.add(Calendar.DAY_OF_MONTH, 1);
            lDate.add(format.format(calBegin.getTime()));
        }
        return lDate;
    }

输出结果：

   public static void main(String[] args) throws Exception {

        System.out.println(getWeekDateList());
    }

二、获取本月日期集合

/***
     * 获取某年某月的所有日期
     * @param year
     * @param month
     * @return
     */
    public static List<String> getMonthFullDay(int year, int month) {
        SimpleDateFormat dateFormatYYYYMMDD = new SimpleDateFormat("yyyy-MM-dd");
        List<String> fullDayList = new ArrayList<>(32);
        // 获得当前日期对象
        Calendar cal = Calendar.getInstance();
        cal.clear();// 清除信息
        cal.set(Calendar.YEAR, year);
        // 1月从0开始
        cal.set(Calendar.MONTH, month - 1);
        // 当月1号
        cal.set(Calendar.DAY_OF_MONTH, 1);
        int count = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        for (int j = 1; j <= count; j++) {
            fullDayList.add(dateFormatYYYYMMDD.format(cal.getTime()));
            cal.add(Calendar.DAY_OF_MONTH, 1);
        }
        return fullDayList;
    }

输出结果

public static void main(String[] args) throws Exception {

        Calendar now = Calendar.getInstance();
        int year = now.get(Calendar.YEAR);
        int month = now.get(Calendar.MONTH) + 1;
        System.out.println(getMonthFullDay(year, month));
}

[2022-04-01, 2022-04-02, 2022-04-03, 2022-04-04, 2022-04-05, 2022-04-06, 2022-04-07, 2022-04-08, 2022-04-09, 2022-04-10, 2022-04-11, 2022-04-12, 2022-04-13, 2022-04-14, 2022-04-15, 2022-04-16, 2022-04-17, 2022-04-18, 2022-04-19, 2022-04-20, 2022-04-21, 2022-04-22, 2022-04-23, 2022-04-24, 2022-04-25, 2022-04-26, 2022-04-27, 2022-04-28, 2022-04-29, 2022-04-30]

三、获取本年月份

/**
     * 获得12个月时间戳
     */
    public static List<String> getMonthStr() throws Exception {
        List<String> list = new ArrayList<String>();
        Long sj = System.currentTimeMillis();//时间戳
        SimpleDateFormat dateformat = new SimpleDateFormat("yyyy");
        String dateStr = dateformat.format(sj);
        for (int i = 1; i <= 12; i++) {
            List<Object> li = new ArrayList<Object>();
            li.add(dateStr + "-" + i);
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            String mydate = dateStr + "-" + i;
            Date datetime = sdf.parse(mydate);
            list.add(sdf.format(datetime));
        }
        return list;
    }

输出结果

public static void main(String[] args) throws Exception {

        System.out.println(getMonthStr());
    }

总结

package com.hvit.user.util;

import org.springframework.util.CollectionUtils;

import java.text.SimpleDateFormat;
import java.util.*;

public class GetDateKeyValueUtils {

    private int inAmount = 10;//初始值
    private int outAmount = 15;

    public static void main(String[] args) throws Exception {

        //System.out.println(getDateBy7(7));
        List<Map<String, Object>> maps = new ArrayList<>();
        Map<String, Object> map = new HashMap<>();
        map.put("date", "2022-04-19");
        map.put("count", 22);
        Map<String, Object> map1 = new HashMap<>();
        map1.put("date", "2022-04-18");
        map1.put("count", 18);
        Map<String, Object> map2 = new HashMap<>();
        map2.put("date", "2022-04-17");
        map2.put("count", 17);
        Map<String, Object> map3 = new HashMap<>();
        map3.put("date", "2022-04-16");
        map3.put("count", 16);
        Map<String, Object> map4 = new HashMap<>();
        map4.put("date", "2022-04-15");
        map4.put("count", 15);
        Map<String, Object> map5 = new HashMap<>();
        map5.put("date", "2022-04-14");
        map5.put("count", 14);
        maps.add(map);
        maps.add(map1);
        maps.add(map2);
        maps.add(map3);
        maps.add(map4);
        maps.add(map5);

        //getDateKey("2", maps);
        //System.out.println(getWeekDateList());
        //Calendar now = Calendar.getInstance();
        ///int year = now.get(Calendar.YEAR);
        //int month = now.get(Calendar.MONTH) + 1;
        //System.out.println(getMonthFullDay(year, month));
        System.out.println(getMonthStr());
    }

    /***
     * 获取周，月，年 key-value
     * @param type
     * @param maps
     * @return
     */
    public static Map<String, Object> getDateKey(String type, List<Map<String, Object>> maps) throws Exception {
        Map<String, Object> map = new LinkedHashMap<>();
        if ("1".equals(type)) {
            getWeekDateList().forEach(date -> {
                map.put(date.toString(), 0);
            });
            if (!CollectionUtils.isEmpty(maps)) {
                maps.forEach(value -> {
                    if (map.containsKey(value.get("date"))) {
                        map.put(value.get("date").toString(), value.get("count"));
                    }
                });
            }
        } else if ("2".equals(type)) {
            Calendar now = Calendar.getInstance();
            int year = now.get(Calendar.YEAR);
            int month = now.get(Calendar.MONTH) + 1;
            getMonthFullDay(year, month).forEach(date -> {
                map.put(date.toString(), 0);
            });
            if (!CollectionUtils.isEmpty(maps)) {
                maps.forEach(value -> {
                    if (map.containsKey(value.get("date"))) {
                        map.put(value.get("date").toString(), value.get("count"));
                    }
                });
            }
        } else if ("3".equals(type)) {
            getMonthStr().forEach(date -> {
                map.put(date.toString(), 0);
            });
            if (!CollectionUtils.isEmpty(maps)) {
                maps.forEach(value -> {
                    if (map.containsKey(value.get("date"))) {
                        map.put(value.get("date").toString(), value.get("count"));
                    }
                });
            }
        }
        return map;
    }

    /**
     * 获取过去或者未来 任意天内的日期数组
     *
     * @param intervals intervals天内
     * @return 日期数组
     */
    public static ArrayList getDateBy7(int intervals) {
        ArrayList pastDaysList = new ArrayList<>();
        for (int i = 0; i < intervals; i++) {
            pastDaysList.add(getPastDate(i));
        }
        Collections.sort(pastDaysList);
        return pastDaysList;
    }


    public static List<String> getWeekDateList() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        // 设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
        cal.setFirstDayOfWeek(Calendar.MONDAY);
        // 获得当前日期是一个星期的第几天
        int dayWeek = cal.get(Calendar.DAY_OF_WEEK);
        if (dayWeek == 1) {
            dayWeek = 8;
        }
        // 根据日历的规则，给当前日期减去星期几与一个星期第一天的差值
        cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - dayWeek);
        Date mondayDate = cal.getTime();

        cal.add(Calendar.DATE, 4 + cal.getFirstDayOfWeek());
        Date sundayDate = cal.getTime();

        List lDate = new ArrayList();
        lDate.add(format.format(mondayDate));
        Calendar calBegin = Calendar.getInstance();
        // 使用给定的 Date 设置此 Calendar 的时间
        calBegin.setTime(mondayDate);
        Calendar calEnd = Calendar.getInstance();
        // 使用给定的 Date 设置此 Calendar 的时间
        calEnd.setTime(sundayDate);
        //测试此日期是否在指定日期之后
        while (sundayDate.after(calBegin.getTime())) {
            // 根据日历的规则，为给定的日历字段添加或减去指定的时间量
            calBegin.add(Calendar.DAY_OF_MONTH, 1);
            lDate.add(format.format(calBegin.getTime()));
        }
        return lDate;
    }


    /**
     * 获取过去第几天的日期
     *
     * @param past
     * @return
     */
    public static String getPastDate(int past) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) - past);
        Date today = calendar.getTime();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        String result = format.format(today);
        return result;
    }

    /**
     * 获取未来 第 past 天的日期
     *
     * @param past
     * @return
     */
    public static String getFetureDate(int past) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) + past);
        Date today = calendar.getTime();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        String result = format.format(today);
        return result;
    }


    /***
     * 获取某年某月的所有日期
     * @param year
     * @param month
     * @return
     */
    public static List<String> getMonthFullDay(int year, int month) {
        SimpleDateFormat dateFormatYYYYMMDD = new SimpleDateFormat("yyyy-MM-dd");
        List<String> fullDayList = new ArrayList<>(32);
        // 获得当前日期对象
        Calendar cal = Calendar.getInstance();
        cal.clear();// 清除信息
        cal.set(Calendar.YEAR, year);
        // 1月从0开始
        cal.set(Calendar.MONTH, month - 1);
        // 当月1号
        cal.set(Calendar.DAY_OF_MONTH, 1);
        int count = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        for (int j = 1; j <= count; j++) {
            fullDayList.add(dateFormatYYYYMMDD.format(cal.getTime()));
            cal.add(Calendar.DAY_OF_MONTH, 1);
        }
        return fullDayList;
    }

    /**
     * 获得12个月时间戳
     */
    public static List<String> getMonthStr() throws Exception {
        List<String> list = new ArrayList<String>();
        Long sj = System.currentTimeMillis();//时间戳
        SimpleDateFormat dateformat = new SimpleDateFormat("yyyy");
        String dateStr = dateformat.format(sj);
        for (int i = 1; i <= 12; i++) {
            List<Object> li = new ArrayList<Object>();
            li.add(dateStr + "-" + i);
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            String mydate = dateStr + "-" + i;
            Date datetime = sdf.parse(mydate);
            list.add(sdf.format(datetime));
        }
        return list;
    }
}