package com.dsh.course.util;
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import java.text.ParseException;
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import java.time.DayOfWeek;
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import java.time.Duration;
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import java.time.LocalDate;
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import java.time.LocalDateTime;
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import java.util.Calendar;
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import java.util.Date;
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/**
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* LocalDateTimeUtils
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* LocalDateTime 时间工具
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*
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* @author yudeshan
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* @version V1.0
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*/
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public class LocalDateTimeUtils {
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private final static int[] dayArr = new int[] { 20, 19, 21, 20, 21, 22, 23, 23, 23, 24, 23, 22 };
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private final static String[] constellationArr = new String[] { "摩羯座", "水瓶座", "双鱼座", "白羊座", "金牛座", "双子座", "巨蟹座", "狮子座", "处女座", "天秤座", "天蝎座", "射手座", "摩羯座" };
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/**
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* 取两个时间相差毫秒数
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*
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* @param start 开始时间
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* @param end 结束时间
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* @return
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*/
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public static long betweenMillis(LocalDateTime start, LocalDateTime end) {
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Duration duration = Duration.between(start, end);
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return duration.toMillis();
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}
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/**
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* 通过生日计算年龄
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* @param birthDay 生日
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* @return
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* @throws ParseException
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*/
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public static int getAgeByBirth(LocalDate birthDay) throws ParseException {
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int age = 0;
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//出生日期晚于当前时间，无法计算
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LocalDate now=LocalDate.now();
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if (birthDay.isAfter(now)) {
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throw new IllegalArgumentException( "生日大于当前时间!");
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}
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//当前年份
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int yearNow = now.getYear();
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//当前月份
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int monthNow = now.getMonthValue();
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//当前日期
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int dayOfMonthNow = now.getDayOfMonth();
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int yearBirth =birthDay.getYear();
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int monthBirth = birthDay.getMonthValue();
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int dayOfMonthBirth = birthDay.getDayOfMonth();
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//计算整岁数
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age = yearNow - yearBirth;
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if (monthNow <= monthBirth) {
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if (monthNow == monthBirth) {
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if (dayOfMonthNow < dayOfMonthBirth){
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//当前日期在生日之前，年龄减一
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age--;
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}
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} else {
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//当前月份在生日之前，年龄减一
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age--;
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}
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}
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return age;
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}
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/**
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* 根据月份计算星座
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*/
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public static String getConstellation(LocalDate date) {
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Integer month=date.getMonthValue();
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Integer day=date.getDayOfMonth();
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return day < dayArr[month - 1] ? constellationArr[month - 1] : constellationArr[month];
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}
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/**
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* 获取当天的星期几
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* @return
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*/
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public static int getWeekStr(){
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LocalDate today = LocalDate.now();
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DayOfWeek dayOfWeek = today.getDayOfWeek();
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return dayOfWeek.getValue();
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}
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/**
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* 根据输入本周的周几，获取当天的时间
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* @param dayOfWeekInput 周几
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* @return
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*/
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public static Date getDateOfWeekNum(int dayOfWeekInput){
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// 获取当前日期
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Calendar calendar = Calendar.getInstance();
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calendar.setTime(new Date());
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// 设置为本周的第一天（星期一）
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calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
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// 根据输入的星期几数值，计算出相应的偏移量
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int dayOfWeekIndex = (dayOfWeekInput + 6) % 7;
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calendar.add(Calendar.DAY_OF_WEEK, dayOfWeekIndex);
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// 获取计算后的日期
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return calendar.getTime();
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}
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}
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