背景
项目中需要获取农历日期，展示在页面，不使用第三方工具类的情况下，直接使用原生的java api工具类开发
代码如下
package com.hidata.devops.paas;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;/*** 把公历时间处理成农历时间** class name: CalendarUtil* description:* authername:wangwenping* modified by: xx* modified time:* modified info :* @version 1.0.0**/public class CalendarUtil {public static void main(String[] args) {Calendar ca = Calendar.getInstance();CalendarUtil c=new CalendarUtil(ca);System.out.println("农历："+c.getDay());}/*** 用于保存中文的月份*/private final static String CHINESE_NUMBER[] = {"一", "二", "三", "四", "五","六", "七", "八", "九", "十", "十一", "腊" };private final static long[] LUNAR_INFO = 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 };/*** 转换为11月22日格式*/private static SimpleDateFormat chineseDateFormat = new SimpleDateFormat("yyyy年MM月dd日");/*** 计算得到农历的年份*/private int mLuchYear;/*** 计算得到农历的月份*/private int mLuchMonth;/*** 计算得到农历的日期*/private int mLuchDay;/*** 用于标识是事为闰年*/private boolean isLoap;/*** 传回农历 year年的总天数** @param year* 将要计算的年份* @return 返回传入年份的总天数*/private static int yearDays(int year) {int i, sum = 348;for (i = 0x8000; i > 0x8; i >>= 1) {if ((LUNAR_INFO[year - 1900] & i) != 0)sum += 1;}return (sum + leapDays(year));}/*** 传回农历 year年闰月的天数** @param year* 将要计算的年份* @return 返回 农历 year年闰月的天数*/private static int leapDays(int year) {if (leapMonth(year) != 0) {if ((LUNAR_INFO[year - 1900] & 0x10000) != 0)return 30;elsereturn 29;} elsereturn 0;}/*** 传回农历 year年闰哪个月 1-12 , 没闰传回 0** @param year* 将要计算的年份* @return 传回农历 year年闰哪个月 1-12 , 没闰传回 0*/private static int leapMonth(int year) {return (int) (LUNAR_INFO[year - 1900] & 0xf);}/*** 传回农历 year年month月的总天数** @param year* 将要计算的年份* @param month* 将要计算的月份* @return 传回农历 year年month月的总天数*/private static int monthDays(int year, int month) {if ((LUNAR_INFO[year - 1900] & (0x10000 >> month)) == 0)return 29;elsereturn 30;}/*** 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 CalendarUtil(Calendar cal) {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);// 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;}if (offset < 0) {offset += daysOfYear;iYear--;}// 农历年份mLuchYear = iYear;leapMonth = leapMonth(iYear); // 闰哪个月,1-12isLoap = 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) && !isLoap) {--iMonth;isLoap = true;daysOfMonth = leapDays(mLuchYear);} elsedaysOfMonth = monthDays(mLuchYear, iMonth);offset -= daysOfMonth;// 解除闰月if (isLoap && iMonth == (leapMonth + 1))isLoap = false;if (!isLoap) {}}// 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 (isLoap) {isLoap = false;} else {isLoap = true;--iMonth;}}// offset小于0时，也要校正if (offset < 0) {offset += daysOfMonth;--iMonth;}mLuchMonth = iMonth;mLuchDay = offset + 1;}/*** 返化成中文格式** @param day* @return*/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";elsereturn chineseTen[day / 10] + CHINESE_NUMBER[n];}/*** 返回农历的年月日** @return 农历的年月日格式*/public String getDay() {return (isLoap ? "闰" : "") + CHINESE_NUMBER[mLuchMonth - 1] + "月"+ getChinaDayString(mLuchDay);}}
运行结果
农历：一月十二Process finished with exit code 0
