阳历转农历
转自：http://www.blogjava.net/soddabao/archive/2007/01/04/91729.html
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class Lunar {
?private int year;
?private int month;
?private int day;
?private boolean leap;
?final static String chineseNumber[] = { "一", "二", "三", "四", "五", "六", "七",
???"八", "九", "十", "十一", "十二" };
?static SimpleDateFormat chineseDateFormat = new SimpleDateFormat(
???"yyyy年MM月dd日");
?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));
?}
?/** */
?/**
? * 传出y年m月d日对应的农历. yearCyl3:农历年与1864的相差数 ? monCyl4:从1900年1月31日以来,闰月数
? * dayCyl5:与1900年1月31日相差的天数,再加40 ?
? *
? * @param cal
? * @return
? */
?public Lunar(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) {
???e.printStackTrace(); // To change body of catch statement use
?????????// Options | File Templates.
??}
??// 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;
?}
?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);
?}
?public static void main(String[] args) throws ParseException {
??Calendar today = Calendar.getInstance();
??today.setTime(chineseDateFormat.parse("2010年3月31日"));
??Lunar lunar = new Lunar(today);
??System.out.println("北京时间：" + chineseDateFormat.format(today.getTime())
????+ " 农历" + lunar);
?}
}
