Java给定公历日期计算相应农历/阴历日期详解编程语言

    import java.text.ParseException;   
import java.text.SimpleDateFormat;   
import java.util.Calendar;   
import java.util.Date;   
/**  
* 注意！此类所得到的农历日期是正确的，但年份是错误的。故，只使用其计算所得的农历日期。 例如： Calendar cal =  
* Calendar.getInstance(); cal.set(1973,4,5); Lunar lunar = new Lunar(cal);  
* System.out.println(lunar.toString());//计算输出阴历日期  
*   
* */   
public class Lunar {   
private int year;   
private int month;   
private int day;   
private boolean leap;   
final static String chineseNumber[] = { "正", "二", "三", "四", "五", "六", "七",   
"八", "九", "十", "十一", "腊" };   
final static String chineseNumber1[] = { "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) {   
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";   
if (day == 20)   
return "二十";   
if (day == 30)   
return "三十";   
return chineseTen[day / 10] + chineseNumber1[n];   
}   
public String toString() {   
return (leap ? "闰" : "") + chineseNumber[month - 1] + "月"   
+ getChinaDayString(day);   
}   
public String getChinaWeekdayString(String weekday) {   
if (weekday.equals("Mon"))   
return "一";   
if (weekday.equals("Tue"))   
return "二";   
if (weekday.equals("Wed"))   
return "三";   
if (weekday.equals("Thu"))   
return "四";   
if (weekday.equals("Fri"))   
return "五";   
if (weekday.equals("Sat"))   
return "六";   
if (weekday.equals("Sun"))   
return "日";   
else   
return "";   
}   
/*  
* public static void main(String[] args) throws ParseException{ Calendar  
* today = Calendar.getInstance(); today.setTime(new  
* java.util.Date());//加载当前日期  
* //today.setTime(chineseDateFormat.parse("2006年10月30日"));//加载自定义日期 Lunar  
* lunar = new Lunar(today);  
* System.out.print(lunar.cyclical()+"年");//计算输出阴历年份  
* System.out.println(lunar.toString());//计算输出阴历日期  
* System.out.println(lunar.animalsYear());//计算输出属相 System.out.println(new  
* java.sql.Date(today.getTime().getTime()));//输出阳历日期  
* System.out.println("星期"  
* +lunar.getChinaWeekdayString(today.getTime().toString  
* ().substring(0,3)));//计算输出星期几 }  
*/   
}