时间工具类

时间工具类

package com.momo.util;

import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.regex.Pattern;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class DateUtil {
	protected static Log logger = LogFactory.getLog(DateUtil.class);

	// 格式：年－月－日 小时：分钟：秒
	public static final String FORMAT_ONE = "yyyy-MM-dd HH:mm:ss";

	// 格式：年－月－日 小时：分钟
	public static final String FORMAT_TWO = "yyyy-MM-dd HH:mm";

	// 格式：年月日 小时分钟秒
	public static final String FORMAT_THREE = "yyyyMMdd-HHmmss";

	// 格式：年－月－日
	public static final String LONG_DATE_FORMAT = "yyyy-MM-dd";

	// 格式：月－日
	public static final String SHORT_DATE_FORMAT = "MM-dd";

	// 格式：小时：分钟：秒
	public static final String LONG_TIME_FORMAT = "HH:mm:ss";

	// 格式：年-月
	public static final String MONTG_DATE_FORMAT = "yyyy-MM";

	// 年的加减
	public static final int SUB_YEAR = Calendar.YEAR;

	// 月加减
	public static final int SUB_MONTH = Calendar.MONTH;

	// 天的加减
	public static final int SUB_DAY = Calendar.DATE;

	// 小时的加减
	public static final int SUB_HOUR = Calendar.HOUR;

	// 分钟的加减
	public static final int SUB_MINUTE = Calendar.MINUTE;

	// 秒的加减
	public static final int SUB_SECOND = Calendar.SECOND;

	static final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };

	@SuppressWarnings("unused")
	private static final SimpleDateFormat timeFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

	public DateUtil() {
	}

	/**
	 * 把符合日期格式的字符串转换为日期类型
	 * 
	 * @param dateStr
	 * @return
	 */
	public static java.util.Date stringtoDate(String dateStr, String format) {
		Date d = null;
		SimpleDateFormat formater = new SimpleDateFormat(format);
		try {
			formater.setLenient(false);
			d = formater.parse(dateStr);
		}
		catch (Exception e) {
			// log.error(e);
			d = null;
		}
		return d;
	}

	/**
	 * 把符合日期格式的字符串转换为日期类型
	 */
	public static java.util.Date stringtoDate(String dateStr, String format, ParsePosition pos) {
		Date d = null;
		SimpleDateFormat formater = new SimpleDateFormat(format);
		try {
			formater.setLenient(false);
			d = formater.parse(dateStr, pos);
		}
		catch (Exception e) {
			d = null;
		}
		return d;
	}

	/**
	 * 把日期转换为字符串
	 * 
	 * @param date
	 * @return
	 */
	public static String dateToString(java.util.Date date, String format) {
		String result = "";
		SimpleDateFormat formater = new SimpleDateFormat(format);
		try {
			result = formater.format(date);
		}
		catch (Exception e) {
			// log.error(e);
		}
		return result;
	}

	/**
	 * 获取当前时间的指定格式
	 * 
	 * @param format
	 * @return
	 */
	public static String getCurrDate(String format) {
		return dateToString(new Date(), format);
	}

	/**
	 * 
	 * @param dateStr
	 * @param amount
	 * @return
	 */
	public static String dateSub(int dateKind, String dateStr, int amount) {
		Date date = stringtoDate(dateStr, FORMAT_ONE);
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.add(dateKind, amount);
		return dateToString(calendar.getTime(), FORMAT_ONE);
	}

	/**
	 * 两个日期相减
	 * 
	 * @param firstTime
	 * @param secTime
	 * @return 相减得到的秒数
	 */
	public static long timeSub(String firstTime, String secTime) {
		long first = stringtoDate(firstTime, FORMAT_ONE).getTime();
		long second = stringtoDate(secTime, FORMAT_ONE).getTime();
		return (second - first) / 1000;
	}

	/**
	 * 获得某月的天数
	 * 
	 * @param year int
	 * @param month int
	 * @return int
	 */
	public static int getDaysOfMonth(String year, String month) {
		int days = 0;
		if (month.equals("1") || month.equals("3") || month.equals("5") || month.equals("7") || month.equals("8") || month.equals("10") || month.equals("12")) {
			days = 31;
		}
		else if (month.equals("4") || month.equals("6") || month.equals("9") || month.equals("11")) {
			days = 30;
		}
		else {
			if ((Integer.parseInt(year) % 4 == 0 && Integer.parseInt(year) % 100 != 0) || Integer.parseInt(year) % 400 == 0) {
				days = 29;
			}
			else {
				days = 28;
			}
		}

		return days;
	}

	/**
	 * 获取某年某月的天数
	 * 
	 * @param year int
	 * @param month int 月份[1-12]
	 * @return int
	 */
	public static int getDaysOfMonth(int year, int month) {
		Calendar calendar = Calendar.getInstance();
		calendar.set(year, month - 1, 1);
		return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
	}

	/**
	 * 获得当前日期
	 * 
	 * @return int
	 */
	public static int getToday() {
		Calendar calendar = Calendar.getInstance();
		return calendar.get(Calendar.DATE);
	}

	/**
	 * 获得当前月份
	 * 
	 * @return int
	 */
	public static int getToMonth() {
		Calendar calendar = Calendar.getInstance();
		return calendar.get(Calendar.MONTH) + 1;
	}

	/**
	 * 获得当前年份
	 * 
	 * @return int
	 */
	public static int getToYear() {
		Calendar calendar = Calendar.getInstance();
		return calendar.get(Calendar.YEAR);
	}

	/**
	 * 返回日期的天
	 * 
	 * @param date Date
	 * @return int
	 */
	public static int getDay(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.DATE);
	}

	/**
	 * 返回日期的年
	 * 
	 * @param date Date
	 * @return int
	 */
	public static int getYear(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.YEAR);
	}

	/**
	 * 返回日期的月份，1-12
	 * 
	 * @param date Date
	 * @return int
	 */
	public static int getMonth(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.MONTH) + 1;
	}

	/**
	 * 计算两个日期相差的天数，如果date2 > date1 返回正数，否则返回负数
	 * 
	 * @param date1 Date
	 * @param date2 Date
	 * @return long
	 */
	public static long dayDiff(Date date1, Date date2) {
		return (date2.getTime() - date1.getTime()) / 86400000;
	}

	/**
	 * 比较两个日期的年差
	 * 
	 * @param befor
	 * @param after
	 * @return
	 */
	public static int yearDiff(String before, String after) {
		Date beforeDay = stringtoDate(before, LONG_DATE_FORMAT);
		Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);
		return getYear(afterDay) - getYear(beforeDay);
	}

	/**
	 * 比较指定日期与当前日期的差
	 * 
	 * @param befor
	 * @param after
	 * @return
	 */
	public static int yearDiffCurr(String after) {
		Date beforeDay = new Date();
		Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);
		return getYear(beforeDay) - getYear(afterDay);
	}

	/**
	 * 比较指定日期与当前日期的差
	 * @param before
	 * @return
	 * @author chenyz
	 */
	public static long dayDiffCurr(String before) {
		Date currDate = DateUtil.stringtoDate(currDay(), LONG_DATE_FORMAT);
		Date beforeDate = stringtoDate(before, LONG_DATE_FORMAT);
		return (currDate.getTime() - beforeDate.getTime()) / 86400000;

	}

	/**
	 * 获取每月的第一周
	 * @param year
	 * @param month
	 * @return
	 * @author chenyz
	 */
	public static int getFirstWeekdayOfMonth(int year, int month) {
		Calendar c = Calendar.getInstance();
		c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天
		c.set(year, month - 1, 1);
		return c.get(Calendar.DAY_OF_WEEK);
	}

	/**
	 * 获取每月的最后一周
	 * @param year
	 * @param month
	 * @return
	 * @author chenyz
	 */
	public static int getLastWeekdayOfMonth(int year, int month) {
		Calendar c = Calendar.getInstance();
		c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天
		c.set(year, month - 1, getDaysOfMonth(year, month));
		return c.get(Calendar.DAY_OF_WEEK);
	}

	/**
	 * 获得当前日期字符串，格式"yyyy_MM_dd_HH_mm_ss"
	 * 
	 * @return
	 */
	public static String getCurrent() {
		Calendar cal = Calendar.getInstance();
		cal.setTime(new Date());
		int year = cal.get(Calendar.YEAR);
		int month = cal.get(Calendar.MONTH) + 1;
		int day = cal.get(Calendar.DAY_OF_MONTH);
		int hour = cal.get(Calendar.HOUR_OF_DAY);
		int minute = cal.get(Calendar.MINUTE);
		int second = cal.get(Calendar.SECOND);
		StringBuffer sb = new StringBuffer();
		return sb.toString();
	}

	/**
	 * 获得当前日期字符串，格式"yyyy-MM-dd HH:mm:ss"
	 * 
	 * @return
	 */
	public static String getNow() {
		Calendar today = Calendar.getInstance();
		return dateToString(today.getTime(), FORMAT_ONE);
	}

	/**
	 * 根据生日获取星座
	 * 
	 * @param birth YYYY-mm-dd
	 * @return
	 */
	public static String getAstro(String birth) {
		if (!isDate(birth)) {
			birth = "2000" + birth;
		}
		if (!isDate(birth)) {
			return "";
		}
		int month = Integer.parseInt(birth.substring(birth.indexOf("-") + 1, birth.lastIndexOf("-")));
		int day = Integer.parseInt(birth.substring(birth.lastIndexOf("-") + 1));
		String s = "魔羯水瓶双鱼牡羊金牛双子巨蟹狮子处女天秤天蝎射手魔羯";
		int[] arr = { 20, 19, 21, 21, 21, 22, 23, 23, 23, 23, 22, 22 };
		int start = month * 2 - (day < arr[month - 1] ? 2 : 0);
		return s.substring(start, start + 2) + "座";
	}

	/**
	 * 判断日期是否有效,包括闰年的情况
	 * 
	 * @param date YYYY-mm-dd
	 * @return
	 */
	public static boolean isDate(String date) {
		StringBuffer reg = new StringBuffer("^((\\d{2}(([02468][048])|([13579][26]))-?((((0?");
		reg.append("[13578])|(1[02]))-?((0?[1-9])|([1-2][0-9])|(3[01])))");
		reg.append("|(((0?[469])|(11))-?((0?[1-9])|([1-2][0-9])|(30)))|");
		reg.append("(0?2-?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][12");
		reg.append("35679])|([13579][01345789]))-?((((0?[13578])|(1[02]))");
		reg.append("-?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))");
		reg.append("-?((0?[1-9])|([1-2][0-9])|(30)))|(0?2-?((0?[");
		reg.append("1-9])|(1[0-9])|(2[0-8]))))))");
		Pattern p = Pattern.compile(reg.toString());
		return p.matcher(date).matches();
	}

	/**
	 * 取得指定日期过 months 月后的日期 (当 months 为负数表示指定月之前);
	 * 
	 * @param date 日期 为null时表示当天
	 * @param month 相加(相减)的月数
	 */
	public static Date nextMonth(Date date, int months) {
		Calendar cal = Calendar.getInstance();
		if (date != null) {
			cal.setTime(date);
		}
		cal.add(Calendar.MONTH, months);
		return cal.getTime();
	}

	/**
	 * 取得指定日期过 day 天后的日期 (当 day 为负数表示指日期之前);
	 * 
	 * @param date 日期 为null时表示当天
	 * @param month 相加(相减)的月数
	 */
	public static Date nextDay(Date date, int day) {
		Calendar cal = Calendar.getInstance();
		if (date != null) {
			cal.setTime(date);
		}
		cal.add(Calendar.DAY_OF_YEAR, day);
		return cal.getTime();
	}

	/**
	 * 取得距离今天 day 日的日期
	 * @param day
	 * @param format
	 * @return
	 * @author chenyz
	 */
	public static String nextDay(int day, String format) {
		Calendar cal = Calendar.getInstance();
		cal.setTime(new Date());
		cal.add(Calendar.DAY_OF_YEAR, day);
		return dateToString(cal.getTime(), format);
	}

	/**
	 * 取得指定日期过 day 周后的日期 (当 day 为负数表示指定月之前)
	 * 
	 * @param date 日期 为null时表示当天
	 */
	public static Date nextWeek(Date date, int week) {
		Calendar cal = Calendar.getInstance();
		if (date != null) {
			cal.setTime(date);
		}
		cal.add(Calendar.WEEK_OF_MONTH, week);
		return cal.getTime();
	}

	/**
	 * 获取当前的日期(yyyy-MM-dd)
	 */
	public static String currDay() {
		return DateUtil.dateToString(new Date(), DateUtil.LONG_DATE_FORMAT);
	}

	/**
	 * 获取昨天的日期
	 * 
	 * @return
	 */
	public static String befoDay() {
		return befoDay(DateUtil.LONG_DATE_FORMAT);
	}

	/**
	 * 根据时间类型获取昨天的日期
	 * @param format
	 * @return
	 * @author chenyz
	 */
	public static String befoDay(String format) {
		return DateUtil.dateToString(DateUtil.nextDay(new Date(), -1), format);
	}

	/**
	 * 获取明天的日期
	 */
	public static String afterDay() {
		return DateUtil.dateToString(DateUtil.nextDay(new Date(), 1), DateUtil.LONG_DATE_FORMAT);
	}

	/**
	 * 取得当前时间距离1900/1/1的天数
	 * 
	 * @return
	 */
	public static int getDayNum() {
		int daynum = 0;
		GregorianCalendar gd = new GregorianCalendar();
		Date dt = gd.getTime();
		GregorianCalendar gd1 = new GregorianCalendar(1900, 1, 1);
		Date dt1 = gd1.getTime();
		daynum = (int) ((dt.getTime() - dt1.getTime()) / (24 * 60 * 60 * 1000));
		return daynum;
	}

	/**
	 * getDayNum的逆方法(用于处理Excel取出的日期格式数据等)
	 * 
	 * @param day
	 * @return
	 */
	public static Date getDateByNum(int day) {
		GregorianCalendar gd = new GregorianCalendar(1900, 1, 1);
		Date date = gd.getTime();
		date = nextDay(date, day);
		return date;
	}

	/** 针对yyyy-MM-dd HH:mm:ss格式,显示yyyymmdd */
	public static String getYmdDateCN(String datestr) {
		if (datestr == null)
			return "";
		if (datestr.length() < 10)
			return "";
		StringBuffer buf = new StringBuffer();
		buf.append(datestr.substring(0, 4)).append(datestr.substring(5, 7)).append(datestr.substring(8, 10));
		return buf.toString();
	}

	/**
	 * 获取本月第一天
	 * 
	 * @param format
	 * @return
	 */
	public static String getFirstDayOfMonth(String format) {
		Calendar cal = Calendar.getInstance();
		cal.set(Calendar.DATE, 1);
		return dateToString(cal.getTime(), format);
	}

	/**
	 * 获取本月最后一天
	 * 
	 * @param format
	 * @return
	 */
	public static String getLastDayOfMonth(String format) {
		Calendar cal = Calendar.getInstance();
		cal.set(Calendar.DATE, 1);
		cal.add(Calendar.MONTH, 1);
		cal.add(Calendar.DATE, -1);
		return dateToString(cal.getTime(), format);
	}

	/**
	 * 获得指定日期的前id天
	 * @param specifiedDay id=1 前一天日期
	 * @return
	 * @throws Exception
	 */
	public static String getSpecifiedDayBefore(String specifiedDay, int id) {
		// SimpleDateFormat simpleDateFormat = new
		// SimpleDateFormat("yyyy-MM-dd");
		Calendar c = Calendar.getInstance();
		Date date = null;
		try {
			date = new SimpleDateFormat("yy-MM-dd").parse(specifiedDay);
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		c.setTime(date);
		int day = c.get(Calendar.DATE);
		c.set(Calendar.DATE, day - id);

		String dayBefore = new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
		return dayBefore;
	}

	/**
	 * 获得指定日期的后一天
	 * @param specifiedDay
	 * @return
	 */
	public static String getSpecifiedDayAfter(String specifiedDay) {
		Calendar c = Calendar.getInstance();
		Date date = null;
		try {
			date = new SimpleDateFormat("yy-MM-dd").parse(specifiedDay);
		}
		catch (Exception e) {
			e.printStackTrace();
		}
		c.setTime(date);
		int day = c.get(Calendar.DATE);
		c.set(Calendar.DATE, day + 1);

		String dayAfter = new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
		return dayAfter;
	}

	/**
	 * 获得包括当前天数在内的前七天字符串数组
	 */
	public static String[] getDateRange(String currentDate, int id) throws ParseException {
		List<String> dateList = new ArrayList<String>();
		for (int i = 1; i <= id; i++) {
			Calendar c = Calendar.getInstance();
			Date date = null;
			date = new SimpleDateFormat("yyyy-MM-dd").parse(currentDate);
			c.setTime(date);
			int day = c.get(Calendar.DATE);
			c.set(Calendar.DATE, day - i);
			String lastDay = new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
			dateList.add(lastDay);
		}
		return dateList.toArray(new String[0]);
	}

	public static void main(String args[]) {
		String str = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
		String str1 = DateUtil.getSpecifiedDayBefore(str, 1);
		String str2 = DateUtil.getSpecifiedDayBefore(str, 2);
		String str3 = DateUtil.getSpecifiedDayBefore(str, 3);
		String str4 = DateUtil.getSpecifiedDayBefore(str, 4);
		System.out.println(str + "\n" + str1 + "\n" + str2 + "\n" + str3 + "\n" + str4);
	}
}