java计算节假日，周末解决思路

    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[] = {"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";            else                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        }    }