java 日历转化-阴历转阳历

package com.cyjlgb.services.backend.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
* <b>描述</b>: 日历转换工具类：阴历和阳历日期互换(阴历日期范围19000101~20491229)<br>
*
* @author liu 2015-1-5
*/
public class CalendarUtil {
// private static final Logger logger = LoggerFactory.getLogger(CalendarUtil.class);
// 计算阴历日期参照1900年到2049年
private final static int[] LUNAR_INFO = {
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
};

// 允许输入的最小年份
private final static int MIN_YEAR = 1900;
// 允许输入的最大年份
private final static int MAX_YEAR = 2049;
// 当年是否有闰月
private static boolean isLeapYear;
// 阳历日期计算起点
private final static String START_DATE = "1900-01-30";

/**
* 计算阴历 {@code year}年闰哪个月 1-12 , 没闰传回 0
*
* @param year 阴历年
* @return (int)月份
* @author liu 2015-1-5
*/
private static int getLeapMonth(int year) {
return (int) (LUNAR_INFO[year - 1900] & 0xf);
}

/**
* 计算阴历{@code year}年闰月多少天
*
* @param year 阴历年
* @return (int)天数
* @author liu 2015-1-5
*/
private static int getLeapMonthDays(int year) {
if (getLeapMonth(year) != 0) {
if ((LUNAR_INFO[year - 1900] & 0xf0000) == 0) {
return 29;
} else {
return 30;
}
} else {
return 0;
}
}

/**
* 计算阴历{@code lunarYeay}年{@code month}月的天数
*
* @param lunarYeay 阴历年
* @param month 阴历月
* @return (int)该月天数
* @throws Exception
* @author liu 2015-1-5
*/
private static int getMonthDays(int lunarYeay, int month) throws Exception {
if ((month > 31) || (month < 0)) {
throw (new Exception("月份有错！"));
}
// 0X0FFFF[0000 {1111 1111 1111} 1111]中间12位代表12个月，1为大月，0为小月
int bit = 1 << (16 - month);
if (((LUNAR_INFO[lunarYeay - 1900] & 0x0FFFF) & bit) == 0) {
return 29;
} else {
return 30;
}
}

/**
* 计算阴历{@code year}年的总天数
*
* @param year 阴历年
* @return (int)总天数
* @author liu 2015-1-5
*/
private static int getYearDays(int year) {
int sum = 29 * 12;
for (int i = 0x8000; i >= 0x8; i >>= 1) {
if ((LUNAR_INFO[year - 1900] & 0xfff0 & i) != 0) {
sum++;
}
}
return sum + getLeapMonthDays(year);
}

/**
* 计算两个阳历日期相差的天数。计算不准确，已经废弃
*
* @param startDate 开始时间
* @param endDate 截至时间
* @return (int)天数
* @author liu 2015-1-5
*/
@Deprecated
private static int daysBetween2(Date startDate, Date endDate) {
long between_days = (endDate.getTime() - startDate.getTime()) / (1000 * 3600 * 24);

return Integer.parseInt(String.valueOf(between_days));
}

/**
* 计算两个阳历日期相差的天数。
*
* @param startDate 开始时间
* @param endDate 截至时间
* @return (int)天数
* @author liu 2017-3-2
*/
private static int daysBetween(Date startDate, Date endDate) {
int days = 0;
//将转换的两个时间对象转换成Calendar对象
Calendar can1 = Calendar.getInstance();
can1.setTime(startDate);
Calendar can2 = Calendar.getInstance();
can2.setTime(endDate);
//拿出两个年份
int year1 = can1.get(Calendar.YEAR);
int year2 = can2.get(Calendar.YEAR);
//天数

Calendar can = null;
//如果can1 < can2
//减去小的时间在这一年已经过了的天数
//加上大的时间已过的天数
if (can1.before(can2)) {
days -= can1.get(Calendar.DAY_OF_YEAR);
days += can2.get(Calendar.DAY_OF_YEAR);
can = can1;
} else {
days -= can2.get(Calendar.DAY_OF_YEAR);
days += can1.get(Calendar.DAY_OF_YEAR);
can = can2;
}
for (int i = 0; i < Math.abs(year2 - year1); i++) {
//获取小的时间当前年的总天数
days += can.getActualMaximum(Calendar.DAY_OF_YEAR);
//再计算下一年。
can.add(Calendar.YEAR, 1);
}
return days;
}

/**
* 检查阴历日期是否合法
*
* @param lunarYear 阴历年
* @param lunarMonth 阴历月
* @param lunarDay 阴历日
* @param leapMonthFlag 闰月标志
* @throws Exception
*/
private static void checkLunarDate(int lunarYear, int lunarMonth, int lunarDay, boolean leapMonthFlag) throws Exception {
if ((lunarYear < MIN_YEAR) || (lunarYear > MAX_YEAR)) {
throw (new Exception("非法农历年份！"));
}
if ((lunarMonth < 1) || (lunarMonth > 12)) {
throw (new Exception("非法农历月份！"));
}
if ((lunarDay < 1) || (lunarDay > 30)) { // 中国的月最多30天
throw (new Exception("非法农历天数！"));
}

int leap = getLeapMonth(lunarYear);// 计算该年应该闰哪个月
if ((leapMonthFlag == true) && (lunarMonth != leap)) {
throw (new Exception("非法闰月！"));
}
}

/**
* 阴历转换为阳历
*
* @param lunarDate 阴历日期,格式YYYYMMDD
* @param leapMonthFlag 是否为闰月
* @return 阳历日期, 格式：YYYYMMDD
* @throws Exception
* @author liu 2015-1-5
*/
public static String lunarToSolar(String lunarDate, boolean leapMonthFlag) throws Exception {
lunarDate = lunarDate.replace("-", "");
// int lunarYear = Integer.parseInt(lunarDate.substring(0, 4));
//计算农历月份在今年是那个阳历日期
int lunarYear = Calendar.getInstance().get(Calendar.YEAR);
int lunarMonth = Integer.parseInt(lunarDate.substring(4, 6));
int lunarDay = Integer.parseInt(lunarDate.substring(6, 8));

checkLunarDate(lunarYear, lunarMonth, lunarDay, leapMonthFlag);

int offset = 0;

for (int i = MIN_YEAR; i < lunarYear; i++) {
int yearDaysCount = getYearDays(i); // 求阴历某年天数
offset += yearDaysCount;
}
//计算该年闰几月
int leapMonth = getLeapMonth(lunarYear);

if (leapMonthFlag & leapMonth != lunarMonth) {
throw (new Exception("您输入的闰月标志有误！"));
}

//当年没有闰月或月份早于闰月或和闰月同名的月份
if (leapMonth == 0 || (lunarMonth < leapMonth) || (lunarMonth == leapMonth && !leapMonthFlag)) {
for (int i = 1; i < lunarMonth; i++) {
int tempMonthDaysCount = getMonthDays(lunarYear, i);
offset += tempMonthDaysCount;
}

// 检查日期是否大于最大天
if (lunarDay > getMonthDays(lunarYear, lunarMonth)) {
throw (new Exception("不合法的农历日期！"));
}
offset += lunarDay; // 加上当月的天数
} else {//当年有闰月，且月份晚于或等于闰月
for (int i = 1; i < lunarMonth; i++) {
int tempMonthDaysCount = getMonthDays(lunarYear, i);
offset += tempMonthDaysCount;
}
if (lunarMonth > leapMonth) {
int temp = getLeapMonthDays(lunarYear); // 计算闰月天数
offset += temp; // 加上闰月天数

if (lunarDay > getMonthDays(lunarYear, lunarMonth)) {
throw (new Exception("不合法的农历日期！"));
}
offset += lunarDay;
} else { // 如果需要计算的是闰月，则应首先加上与闰月对应的普通月的天数
// 计算月为闰月
int temp = getMonthDays(lunarYear, lunarMonth); // 计算非闰月天数
offset += temp;

if (lunarDay > getLeapMonthDays(lunarYear)) {
throw (new Exception("不合法的农历日期！"));
}
offset += lunarDay;
}
}

SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
Date myDate = null;
myDate = formatter.parse(START_DATE);
Calendar c = Calendar.getInstance();
c.setTime(myDate);
c.add(Calendar.DATE, offset);
myDate = c.getTime();

return formatter.format(myDate);
}

/**
* 阳历日期转换为阴历日期
*
* @param solarDate 阳历日期,格式YYYYMMDD
* @return 阴历日期
* @throws Exception
* @author liu 2015-1-5
*/
public static String solarToLunar(String solarDate) throws Exception {
int i;
int temp = 0;
int lunarYear;
int lunarMonth; //农历月份
int lunarDay; //农历当月第几天
boolean leapMonthFlag = false;

SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");
Date myDate = null;
Date startDate = null;
try {
myDate = formatter.parse(solarDate);
startDate = formatter.parse(START_DATE);
} catch (ParseException e) {
e.printStackTrace();
}

int offset = daysBetween(startDate, myDate);

for (i = MIN_YEAR; i <= MAX_YEAR; i++) {
temp = getYearDays(i); //求当年农历年天数
if (offset - temp < 1) {
break;
} else {
offset -= temp;
}
}
lunarYear = i;

int leapMonth = getLeapMonth(lunarYear);//计算该年闰哪个月
//设定当年是否有闰月
if (leapMonth > 0) {
isLeapYear = true;
} else {
isLeapYear = false;
}

for (i = 1; i <= 12; i++) {
if (i == leapMonth + 1 && isLeapYear) {
temp = getLeapMonthDays(lunarYear);
isLeapYear = false;
leapMonthFlag = true;
i--;
} else {
temp = getMonthDays(lunarYear, i);
}
offset -= temp;
if (offset <= 0) {
break;
}
}

offset += temp;
lunarMonth = i;
lunarDay = offset;
// return lunarYear + "-" + lunarMonth + "-" + lunarDay;

return "阴历：" + lunarYear + "年" + (leapMonthFlag & (lunarMonth == leapMonth) ? "闰" : "") + lunarMonth + "月" + lunarDay + "日";
}

public static void main(String[] args) throws Exception {
System.out.println("******阴历转阳历******");
System.out.println(CalendarUtil.lunarToSolar("1997-04-06", false));
System.out.println(CalendarUtil.lunarToSolar("19841021", false));
/*System.out.println("******阳历转阴历******");
System.out.println(CalendarUtil.solarToLunar("20181214"));
System.out.println(CalendarUtil.solarToLunar("19000924"));
System.out.println(CalendarUtil.solarToLunar("19001022"));
System.out.println(CalendarUtil.solarToLunar("19001023"));

System.out.println(CalendarUtil.solarToLunar("19900630"));
System.out.println(CalendarUtil.solarToLunar("19841213"));
System.out.println(CalendarUtil.solarToLunar("19910119"));*/
}
}

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