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package com.yihu.jw.util.date;
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import com.alibaba.fastjson.JSON;
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import com.alibaba.fastjson.JSONObject;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.Reader;
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import java.net.URL;
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import java.net.URLConnection;
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import java.nio.charset.StandardCharsets;
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import java.text.SimpleDateFormat;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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import java.util.TimeZone;
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import java.util.concurrent.locks.ReadWriteLock;
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import java.util.concurrent.locks.ReentrantReadWriteLock;
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/**
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* 原生java调用(除开JSON)
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* 线程不安全
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*
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* @author holate
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*/
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public class Holiday {
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/**
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* 网址前缀
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*/
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private static final String BASE_PREFIX = "https://gitee.com/holate/public-holiday/raw/master/holidays/year/";
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/**
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* 网址后缀
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*/
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private static final String BASE_SUFFIX = ".json";
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/**
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* 使用读写锁(单线程忽略)
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*/
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private static final ReadWriteLock READ_WRITE_LOCK = new ReentrantReadWriteLock();
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/**
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* 法律规定的放假日期，30+366*2/7向上取整
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*/
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private static final Set<String> LAW_HOLIDAYS = new HashSet<>(135);
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/**
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* 由于放假需要额外工作的周末，366*5/7向上取整
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*/
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private static final Set<String> EXTRA_WORKDAYS = new HashSet<>(262);
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/**
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* 调用接口获取过的年份,大小设置为4年
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*/
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private static final Set<Integer> ALREADY_OBTAIN = new HashSet<>(4);
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/**
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* 格式化日期到天
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*/
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private static final String TO_DAY = "yyyy-MM-dd";
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/**
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* 调用接口每天调用一次，记录上一次调用日期
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*/
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private static String initDate = "";
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/**
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* 返回指定日期后{@param days}个工作日的日期
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*
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* @param startDate 开始日期
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* @param days 工作日数
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* @return {@link Date}
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* @date 2020/10/26
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* @author holate
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*/
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public static Date calculateWorkDay(Date startDate, int days) {
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// 每日清理节假日重新从接口获取
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cleanDate();
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if (startDate == null) {
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return null;
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}
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READ_WRITE_LOCK.readLock().lock();
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try {
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Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT+8"));
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cal.setTime(startDate);
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//累加自然日
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for (int i = 1; i <= days; i++) {
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cal.add(Calendar.DATE, 1);
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Integer year = cal.get(Calendar.YEAR);
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//如果那一年的数据没有获取过，则获取数据
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if (!ALREADY_OBTAIN.contains(year)) {
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getHolidayForMonth(year);
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}
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//如果是假日，延后一天
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if (isHoliday(cal)) {
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days++;
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}
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}
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return cal.getTime();
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} finally {
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READ_WRITE_LOCK.readLock().unlock();
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}
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}
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/**
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* 返回指定日期后{@param days}个自然日的日期
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*
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* @param startDate 开始日期
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* @param days 自然日数
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* @return {@link Date}
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* @date 2020/10/26
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* @author holate
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*/
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public static Date calculateNormalDay(Date startDate, int days) {
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if (startDate == null) {
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return null;
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}
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Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT+8"));
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cal.setTime(startDate);
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cal.add(Calendar.DATE, days);
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return cal.getTime();
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}
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/**
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* 返回指定日期后{@param days}个节假日的日期
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*
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* @param startDate 开始日期
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* @param days 自然日数
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* @return {@link Date}
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* @date 2020/10/26
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* @author holate
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*/
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public static Date calculateNextHoliday(Date startDate, int days) {
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// 每日清理节假日重新从接口获取
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cleanDate();
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if (startDate == null) {
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return null;
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}
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READ_WRITE_LOCK.readLock().lock();
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try {
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Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT+8"));
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cal.setTime(startDate);
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//累加自然日
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for (int i = 1; i <= days; i++) {
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cal.add(Calendar.DATE, 1);
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Integer year = cal.get(Calendar.YEAR);
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//如果那一年的数据没有获取过，则获取数据
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if (!ALREADY_OBTAIN.contains(year)) {
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getHolidayForMonth(year);
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}
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//如果是假日，延后一天
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if (!isHoliday(cal)) {
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days++;
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}
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}
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return cal.getTime();
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} finally {
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READ_WRITE_LOCK.readLock().unlock();
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}
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}
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/**
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* 判断一天是不是工作日
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*
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* @param date 日期
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* @return true:休息日，false:工作日
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* @date 2020/10/26
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*/
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public static boolean isHoliday(Date date) {
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cleanDate();
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Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT+8"));
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cal.setTime(date);
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Integer year = cal.get(Calendar.YEAR);
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if (!ALREADY_OBTAIN.contains(year)) {
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getHolidayForMonth(year);
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}
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return isHoliday(cal);
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}
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/**
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* 判断一天是不是休息日
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*
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* @param cal 日期
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* @return true:休息日，false:工作日
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* @date 2020/10/26
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*/
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private static boolean isHoliday(Calendar cal) {
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SimpleDateFormat simpleFormat = new SimpleDateFormat(TO_DAY);
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String day = simpleFormat.format(cal.getTime());
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// 法定节假日必定是休息日
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if (LAW_HOLIDAYS.contains(day)) {
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return true;
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}
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// 排除法定节假日外的非周末必定是工作日
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if (!isWeekend(cal)) {
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return false;
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}
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// 所有周末中只有非补班的才是休息日
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return !EXTRA_WORKDAYS.contains(day);
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}
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/**
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* 判断是否为周末
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*
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* @param cal 日期
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* @return true:是周末，false:不是周末
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* @date 2020/10/26
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* @author holate
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*/
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private static boolean isWeekend(Calendar cal) {
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return cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY || cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY;
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}
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/**
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* 每天清空日期
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*
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* @date 2020/10/26
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* @author holate
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*/
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private static void cleanDate() {
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SimpleDateFormat simpleFormat = new SimpleDateFormat(TO_DAY);
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String day = simpleFormat.format(new Date());
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//如果初始化时间不为当天
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if (!day.equals(initDate)) {
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READ_WRITE_LOCK.writeLock().lock();
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try {
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if (!day.equals(initDate)) {
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ALREADY_OBTAIN.clear();
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EXTRA_WORKDAYS.clear();
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LAW_HOLIDAYS.clear();
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initDate = day;
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}
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} finally {
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READ_WRITE_LOCK.writeLock().unlock();
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}
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}
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}
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/**
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* 通过年月查询第三方节假日，获取节日和调休的工作日
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*
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* @param year 年份
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* @return {@link Set<Calendar>}
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* @date 2020/10/26
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* @author holate
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*/
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@SuppressWarnings("unchecked")
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private static void getHolidayForMonth(Integer year) {
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//json对象，获取值使用的键
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String holiday = "holiday";
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//访问url
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String url = BASE_PREFIX + year + BASE_SUFFIX;
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String json = getUrl(url);
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if (json.length() == 0) {
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return;
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}
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//构建json对象
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JSONObject body = JSON.parseObject(json);
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Map<String, JSONObject> days = (Map<String, JSONObject>) body.get(holiday);
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for (Map.Entry<String, JSONObject> entry : days.entrySet()) {
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Boolean isHoliday = (Boolean) entry.getValue().get(holiday);
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if (isHoliday) {
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LAW_HOLIDAYS.add(year + "-" + entry.getKey());
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} else {
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EXTRA_WORKDAYS.add(year + "-" + entry.getKey());
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}
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}
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ALREADY_OBTAIN.add(year);
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}
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/**
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* 使用get请求访问url
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*
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* @param url 网址
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* @return {@link String} 返回响应内容
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* @date 2020/10/26
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* @author holate
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*/
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private static String getUrl(String url) {
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//访问返回结果
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StringBuilder result = new StringBuilder();
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//读取访问结果
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BufferedReader read = null;
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try {
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//创建url
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URL realUrl = new URL(url);
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//打开连接
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URLConnection connection = realUrl.openConnection();
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// 设置通用的请求属性
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connection.setRequestProperty("accept", "*/*");
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connection.setRequestProperty("connection", "Keep-Alive");
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connection.setRequestProperty("user-agent", "Mozilla/5.0");
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//建立连接
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connection.connect();
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// 定义 BufferedReader输入流来读取URL的响应
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read = new BufferedReader(new InputStreamReader(
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connection.getInputStream(), StandardCharsets.UTF_8));
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String line;//循环读取
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while ((line = read.readLine()) != null) {
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result.append(line).append("\n");
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}
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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closeReader(read);
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}
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return result.toString();
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}
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/**
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* 关闭读取字符流
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*
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* @param reader 读取字符流
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* @date 2020/10/26
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* @author holate
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*/
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private static void closeReader(Reader reader) {
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if (reader != null) {
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try {
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reader.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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}
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