Java给定公历日期计算相应农历/阴历日期

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

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