Java农历（阴历）工具类

在真实的项目开发中会可能会遇到项目需要对阴历即我们所说的农历节日的支持，因此在网上找了一些资料整理出一个工具类。

 

package com.iflytek.date;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * 阴历(农历)工具类
 * 
 * @author xudongwang 2012-1-18
 * 
 *         Email:[e-mail]
 */
public class LunarCalendar {

	/**
	 * 农历年
	 */
	private int year;
	/**
	 * 农历年
	 */
	private int month;
	/**
	 * 农历日
	 */
	private int day;
	/**
	 * 农历日
	 */
	private boolean leap;

	/**
	 * 中文月名称
	 */
	final static String chineseNumber[] = { "一", "二", "三", "四", "五", "六", "七",
			"八", "九", "十", "十一", "十二" };
	/**
	 * 中文日期格式
	 */
	static SimpleDateFormat chineseDateFormat = new SimpleDateFormat(
			"yyyy年MM月dd日");
	/**
	 * 农历数据， 1901 ~ 2100 年之间正确
	 */
	final static long[] lunarInfo = new long[] { 0x04bd8, 0x04ae0, 0x0a570,
			0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2,
			0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0,
			0x0ada2, 0x095b0, 0x14977, 0x04970, 0x0a4b0, 0x0b4b5, 0x06a50,
			0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970, 0x06566,
			0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0,
			0x1c8d7, 0x0c950, 0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4,
			0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557, 0x06ca0, 0x0b550,
			0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950,
			0x06aa0, 0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260,
			0x0f263, 0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5, 0x04ad0,
			0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6,
			0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40,
			0x0af46, 0x0ab60, 0x09570, 0x04af5, 0x04970, 0x064b0, 0x074a3,
			0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0, 0x0c960,
			0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0,
			0x092d0, 0x0cab5, 0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9,
			0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930, 0x07954, 0x06aa0,
			0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65,
			0x0d530, 0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0,
			0x1d0b6, 0x0d250, 0x0d520, 0x0dd45, 0x0b5a0, 0x056d0, 0x055b2,
			0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0 };

	// 传回农历 y年的总天数
	final private static int yearDays(int y) {
		int i, sum = 348;
		for (i = 0x8000; i > 0x8; i >>= 1) {
			if ((lunarInfo[y - 1900] & i) != 0)
				sum += 1;
		}
		return (sum + leapDays(y));
	}

	// 传回农历 y年闰月的天数
	final private static int leapDays(int y) {
		if (leapMonth(y) != 0) {
			if ((lunarInfo[y - 1900] & 0x10000) != 0)
				return 30;
			else
				return 29;
		} else
			return 0;
	}

	// 传回农历 y年闰哪个月 1-12 , 没闰传回 0
	final private static int leapMonth(int y) {
		return (int) (lunarInfo[y - 1900] & 0xf);
	}

	// 传回农历 y年m月的总天数
	final private static int monthDays(int y, int m) {
		if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0)
			return 29;
		else
			return 30;
	}

	// 传回农历 y年的生肖
	final public String animalsYear() {
		final String[] Animals = new String[] { "鼠", "牛", "虎", "兔", "龙", "蛇",
				"马", "羊", "猴", "鸡", "狗", "猪" };
		return Animals[(year - 4) % 12];
	}

	// 传入 月日的offset 传回干支, 0=甲子
	final private static String cyclicalm(int num) {
		final String[] Gan = new String[] { "甲", "乙", "丙", "丁", "戊", "己", "庚",
				"辛", "壬", "癸" };
		final String[] Zhi = new String[] { "子", "丑", "寅", "卯", "辰", "巳", "午",
				"未", "申", "酉", "戌", "亥" };
		return (Gan[num % 10] + Zhi[num % 12]);
	}

	// 传入 offset 传回干支, 0=甲子
	final public String cyclical() {
		int num = year - 1900 + 36;
		return (cyclicalm(num));
	}

	/**
	 * 构造一个表示当前日期的农历日历
	 */
	public LunarCalendar() {
		this(Calendar.getInstance());
	}

	/**
	 * 构造一个表示指定日期的农历日历
	 */
	public LunarCalendar(Date date) {
		this(date2calendar(date));
	}

	private static Calendar date2calendar(Date date) {
		Calendar tmpCale = Calendar.getInstance();
		tmpCale.setTime(date);
		return tmpCale;
	}

	/**
	 * 使用指定日历日期构造一个农历日历
	 * 
	 * @param cal
	 */
	public LunarCalendar(Calendar cal) {
		@SuppressWarnings("unused")
		int yearCyl, monCyl, dayCyl;
		int leapMonth = 0;
		Date baseDate = null;
		try {
			baseDate = chineseDateFormat.parse("1900年1月31日");
		} catch (ParseException e) {
		}

		// 求出和1900年1月31日相差的天数
		int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);
		dayCyl = offset + 40;
		monCyl = 14;

		// 用offset减去每农历年的天数
		// 计算当天是农历第几天
		// i最终结果是农历的年份
		// offset是当年的第几天
		int iYear, daysOfYear = 0;
		for (iYear = 1900; iYear < 2050 && offset > 0; iYear++) {
			daysOfYear = yearDays(iYear);
			offset -= daysOfYear;
			monCyl += 12;
		}
		if (offset < 0) {
			offset += daysOfYear;
			iYear--;
			monCyl -= 12;
		}
		// 农历年份
		year = iYear;

		yearCyl = iYear - 1864;
		leapMonth = leapMonth(iYear); // 闰哪个月,1-12
		leap = false;

		// 用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天
		int iMonth, daysOfMonth = 0;
		for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
			// 闰月
			if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
				--iMonth;
				leap = true;
				daysOfMonth = leapDays(year);
			} else
				daysOfMonth = monthDays(year, iMonth);

			offset -= daysOfMonth;
			// 解除闰月
			if (leap && iMonth == (leapMonth + 1))
				leap = false;
			if (!leap)
				monCyl++;
		}
		// offset为0时，并且刚才计算的月份是闰月，要校正
		if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
			if (leap) {
				leap = false;
			} else {
				leap = true;
				--iMonth;
				--monCyl;
			}
		}
		// offset小于0时，也要校正
		if (offset < 0) {
			offset += daysOfMonth;
			--iMonth;
			--monCyl;
		}
		month = iMonth;
		day = offset + 1;
	}

	/**
	 * 获得表示农历年月日的日期对象
	 * 
	 * @return
	 */
	public Date getDate() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.YEAR, year);
		calendar.set(Calendar.MONTH, month - 1);
		calendar.set(Calendar.DAY_OF_MONTH, day);
		return calendar.getTime();
	}

	public static String getChinaDayString(int day) {
		String chineseTen[] = { "初", "十", "廿", "卅" };
		int n = day % 10 == 0 ? 9 : day % 10 - 1;
		if (day > 30)
			return "";
		if (day == 10)
			return "初十";
		else
			return chineseTen[day / 10] + chineseNumber[n];
	}

	public String toString() {
		return year + "年" + (leap ? "闰" : "") + chineseNumber[month - 1] + "月"
				+ getChinaDayString(day);
	}

}

 测试：

 

package com.iflytek.date;

import java.util.Date;

/**
 * @author xudongwang 2012-1-18
 * 
 *         Email:[e-mail]
 */
public class Test {
	public static void main(String[] args) {
		LunarCalendar lunarCalendar = new LunarCalendar(new Date());
		System.out.println(lunarCalendar.toString());
	}
}