时间工具类

2021-08-06 10:59:17 阅读：164 来源： 互联网

标签：return endLocalDate localDate beginLocalDate 时间 static 工具 LocalDate

package com.example.demo;

import java.text.SimpleDateFormat;
import java.time.*;
import java.time.temporal.ChronoField;
import java.time.temporal.WeekFields;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class LocalDateUtil {

private static WeekFields weekFields = WeekFields.of(DayOfWeek.MONDAY,4);

/**
 * 获取相隔n天的日期
 * @param n
 * @return
 */
public static LocalDate getIntervalDayLocalDate(int n) {
    LocalDate localDate = LocalDate.now();
    localDate = localDate.minusDays(n);
    return localDate;
}

/**
 * 获取本周的第一天(周一)
 * @return
 */
public static LocalDate getFirstDayOfWeek() {
    LocalDate localDate = LocalDate.now();
    localDate = localDate.with(DayOfWeek.MONDAY);
    return localDate;
}

/**
 * 获取相隔n周的日期
 * @param n
 * @return
 */
public static LocalDate getIntervalWeekLocalDate(int n) {
    LocalDate localDate = getFirstDayOfWeek();
    localDate = localDate.minusWeeks(n);
    return localDate;
}

/**
 * 获取相隔n周的日期
 * @param n
 * @return
 */
public static LocalDate getFirstDayOfLatelyWeek(LocalDate localDate, int n) {
    localDate = localDate.minusWeeks(n-1);
    localDate = localDate.with(DayOfWeek.MONDAY);
    return localDate;
}

/**
 * 获取本月的第一天
 * @return
 */
public static LocalDate getFirstDayOfMonth() {
    LocalDate localDate = LocalDate.now();
    localDate = localDate.withDayOfMonth(1);
    return localDate;
}

/**
 * 获取相隔n月的日期
 * @param n
 * @return
 */
public static LocalDate getIntervalMonthLocalDate(int n) {
    LocalDate localDate = getFirstDayOfMonth();
    localDate = localDate.minusMonths(n);
    return localDate;
}

/**
 * 获取相隔n月的日期
 * @param n
 * @return
 */
public static LocalDate getFirstDayOfLatelyMonth(LocalDate localDate, int n) {
    localDate = localDate.minusMonths(n-1);
    localDate = localDate.withDayOfMonth(1);
    return localDate;
}

/**
 * 获取本年的第一天
 * @return
 */
public static LocalDate getFirstDayOfYear() {
    LocalDate localDate = LocalDate.now();
    localDate = localDate.withDayOfYear(1);
    return localDate;
}

/**
 * 获取当前日期自然周
 * @param localDate
 * @return
 */
public static int getWeekOfYear(LocalDate localDate) {
    return localDate.get(weekFields.weekOfWeekBasedYear());
}

/**
 * 获取当前日期年周
 * @param localDate
 * @return
 */
public static String getYearWeek(LocalDate localDate) {
    int week = localDate.get(weekFields.weekOfWeekBasedYear());
    return  localDate.get(ChronoField.YEAR)+""+(week<10?"0"+week:week);
}

/**
 * 获取两个时间区间内的周集合
 * @param beginLocalDate
 * @param endLocalDate
 * @return
 */
public static List<String> getYearWeekList(LocalDate beginLocalDate, LocalDate endLocalDate){
    List<String> weekList = new ArrayList<>();
    if (beginLocalDate.isAfter(endLocalDate)) {
        return null;
    }
    while(!beginLocalDate.isAfter(endLocalDate)) {
        weekList.add(getYearWeek(beginLocalDate));
        beginLocalDate = beginLocalDate.minusWeeks(-1);
    }
    if (!weekList.contains(getYearWeek(endLocalDate))) {
        weekList.add(getYearWeek(beginLocalDate));
    }
    return weekList;
}

/**
 * 获取当前日期年月
 * @param localDate
 * @return
 */
public static String getYearMonth(LocalDate localDate) {
    int month = localDate.get(ChronoField.MONTH_OF_YEAR);

    return localDate.get(ChronoField.YEAR)+"-"+(month<10?"0"+month:month);
}

/**
 * 获取当前日期年月
 * @param localDate
 * @return
 */
public static String getYearMonth(LocalDate localDate, String connector) {
    int month = localDate.get(ChronoField.MONTH_OF_YEAR);

    return localDate.get(ChronoField.YEAR)+connector+(month<10?"0"+month:month);
}

/**
 * 获取两个时间段内的月集合
 * @param beginLocalDate
 * @param endLocalDate
 * @return
 */
public static List<String> getYearMonthList(LocalDate beginLocalDate, LocalDate endLocalDate){
    List<String> monthList = new ArrayList<>();
    if (beginLocalDate.isAfter(endLocalDate)) {
        return null;
    }
    while(!beginLocalDate.isAfter(endLocalDate)) {
        monthList.add(getYearMonth(beginLocalDate));
        beginLocalDate = beginLocalDate.minusMonths(-1);
    }
    if (!monthList.contains(getYearMonth(endLocalDate))) {
        monthList.add(getYearMonth(beginLocalDate));
    }
    return monthList;
}

/**
 * 获取指定日期的年月日(yyyy-MM-dd)
 * @param localDate
 * @return
 */
public static String getYearMonthDay(LocalDate localDate) {
    int month = localDate.get(ChronoField.MONTH_OF_YEAR);
    int day = localDate.get(ChronoField.DAY_OF_MONTH);

    return localDate.get(ChronoField.YEAR)+"-"+(month<10?"0"+month:month)+"-"+(day<10?"0"+day:day);
}

/**
 * 获取两个时间段内的天集合
 * @param beginLocalDate
 * @param endLocalDate
 * @return
 */
public static List<String> getYearMonthDayList(LocalDate beginLocalDate, LocalDate endLocalDate){
    List<String> dayList = new ArrayList<>();
    if (beginLocalDate.isAfter(endLocalDate)) {
        return null;
    }
    while(!beginLocalDate.isAfter(endLocalDate)) {
        dayList.add(getYearMonthDay(beginLocalDate));
        beginLocalDate = beginLocalDate.minusDays(-1);
    }
    if (!dayList.contains(getYearMonthDay(endLocalDate))) {
        dayList.add(getYearMonthDay(beginLocalDate));
    }
    return dayList;
}

/**
 * convert LocalDate to Date
 * @param localDate
 * @return
 */
public static LocalDate DateToLocalDate(Date date) {
    Instant instant = date.toInstant();
    ZoneId zone = ZoneId.systemDefault();
    LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);
    LocalDate localDate = localDateTime.toLocalDate();
    return localDate;
}

/**
 * convert LocalDate to Date
 * @param localDate
 * @return
 */
public static Date LocalDateToDate(LocalDate localDate) {
    ZoneId zone = ZoneId.systemDefault();
    Instant instant = localDate.atStartOfDay().atZone(zone).toInstant();
    return Date.from(instant);
}

public static void main(String[] args) {
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

    Date date = LocalDateToDate(getFirstDayOfWeek());
    System.out.println("本周第一天：" + sdf.format(date));

    date = LocalDateToDate(getFirstDayOfMonth());
    System.out.println("本月第一天：" + sdf.format(date));

    date = LocalDateToDate(getFirstDayOfYear());
    System.out.println("本年第一天：" + sdf.format(date));

    date = LocalDateToDate(getIntervalDayLocalDate(5));
    System.out.println("相隔5天：" + sdf.format(date));

    date = LocalDateToDate(getIntervalWeekLocalDate(1));
    System.out.println("相隔1周：" + sdf.format(date));

    date = LocalDateToDate(getIntervalMonthLocalDate(2));
    System.out.println("相隔2月：" + sdf.format(date));

    LocalDate beginLocalDate = LocalDate.now();
    LocalDate endLocalDate = LocalDate.now();
    beginLocalDate = beginLocalDate.minusDays(300);

    List<String> monthList = getYearMonthList(beginLocalDate, endLocalDate);
    System.out.println("获取两个时间段内的月集合" +monthList);

    List<String> weekList = getYearWeekList(beginLocalDate, endLocalDate);
    System.out.println("获取两个时间区间内的周集合" +weekList);

    beginLocalDate = endLocalDate.minusDays(10);
    List<String> dayList = getYearMonthDayList(beginLocalDate, endLocalDate);
    System.out.println("获取两个时间段内的天集合" +dayList);
}

}

标签：return,endLocalDate,localDate,beginLocalDate,时间,static,工具,LocalDate
来源： https://blog.csdn.net/weixin_47520834/article/details/119449238

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时间工具类