前幾天在blog中,對(duì)網(wǎng)友的java萬(wàn)年歷作修改,看到有的網(wǎng)友說(shuō)能不能加上農(nóng)歷,后來(lái)在網(wǎng)上看到有人寫過幾個(gè)陽(yáng)歷轉(zhuǎn)陰歷的算法,我比較了一個(gè)發(fā)現(xiàn),這個(gè)算法還算不錯(cuò),只要有的計(jì)算機(jī)編程基礎(chǔ)的人看明白應(yīng)該是沒有問題的,其實(shí)這個(gè)就和我們以前在c中,判斷一天是周幾的算法差不多,都是和某一個(gè)特定的時(shí)間作比較,算出差多少天,再根據(jù)月大月小瑞月這些規(guī)則,算出是農(nóng)歷的那年那月那日.
Java代碼
package clock;
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};
//====== 傳回農(nóng)歷 y年的總天數(shù)
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));
}
//====== 傳回農(nóng)歷 y年閏月的天數(shù)
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;
}
//====== 傳回農(nóng)歷 y年閏哪個(gè)月 1-12 , 沒閏傳回 0
final private static int leapMonth(int y) {
return (int) (lunarInfo[y - 1900] & 0xf);
}
//====== 傳回農(nóng)歷 y年m月的總天數(shù)
final private static int monthDays(int y, int m) {
if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0)
return 29;
else
return 30;
}
//====== 傳回農(nóng)歷 y年的生肖
final public String animalsYear() {
final String[] Animals = new String[]{"鼠", "牛", "虎", "兔", "龍", "蛇", "馬", "羊", "猴", "雞", "狗", "豬"};
return Animals[(year - 4) % 12];
}
//====== 傳入 月日的offset 傳回干支, 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]);
}
//====== 傳入 offset 傳回干支, 0=甲子
final public String cyclical() {
int num = year - 1900 + 36;
return (cyclicalm(num));
}
/** *//**
* 傳出y年m月d日對(duì)應(yīng)的農(nóng)歷.
* yearCyl3:農(nóng)歷年與1864的相差數(shù) ?
* monCyl4:從1900年1月31日以來(lái),閏月數(shù)
* dayCyl5:與1900年1月31日相差的天數(shù),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日相差的天數(shù)
int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);
dayCyl = offset + 40;
monCyl = 14;
//用offset減去每農(nóng)歷年的天數(shù)
// 計(jì)算當(dāng)天是農(nóng)歷第幾天
//i最終結(jié)果是農(nóng)歷的年份
//offset是當(dāng)年的第幾天
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;
}
//農(nóng)歷年份
year = iYear;
yearCyl = iYear - 1864;
leapMonth = leapMonth(iYear); //閏哪個(gè)月,1-12
leap = false;
//用當(dāng)年的天數(shù)offset,逐個(gè)減去每月（農(nóng)歷）的天數(shù)，求出當(dāng)天是本月的第幾天
int iMonth, daysOfMonth = 0;
for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
//閏月
if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
--iMonth;
leap = true;
daysOfMonth = leapDays(year);
} else
daysOfMonth = monthDays(year, iMonth);
offset -= daysOfMonth;
//解除閏月
if (leap && iMonth == (leapMonth + 1)) leap = false;
if (!leap) monCyl++;
}
//offset為0時(shí)，并且剛才計(jì)算的月份是閏月，要校正
if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
if (leap) {
leap = false;
} else {
leap = true;
--iMonth;
--monCyl;
}
}
//offset小于0時(shí)，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 ? "閏" : "") + chineseNumber[month - 1] + "月" + getChinaDayString(day);
}
public static void main(String[] args) throws ParseException {
Calendar today = Calendar.getInstance();
today.setTime(chineseDateFormat.parse("2003年1月1日"));
Lunar lunar = new Lunar(today);
System.out.println("北京時(shí)間：" + chineseDateFormat.format(today.getTime()) + " 農(nóng)歷" + lunar);
}
}