我的Java日期处理类(简单)

      昨天发了篇博文，不想有朋友对标题有些误解了，所以我提前说明下，本篇博文只是记录下我的时间处理类，功能非常简单，主要方法有：

 

      1，格式化日期与显示日期，包括中文方法友好的显示，如1年前。

      2，给日期加上几天或者几个月。

      3，得到今天的开始时间与结束时间,如2014-03-05 0:00:00~2014-03-05 23:59:59。

      4，得到今天对应的月份的开始时间与结束时间。

      5，得到今天对应年的开始时间与结束时间。

      6，得到今天星期几，是否是周六周末

      7，得到今天对应月份最大天数。

      8，得到2个日期是否是同一天，相差多少年，多少月，多少天。

      9，得到2个月份之间的月份，返回值List<字符串>。

  

      下面是代码，有些代码从网上摘抄的，原始出处忘了，看的朋友如果发现里面有你的代码片段，欢迎留言，我添加上去。最后一个是我写的。

      

public class 我的时间工具类 {
	private static final String YYYYMM = "yyyyMM";
	private static final String YYYY_MM_DD = "yyyy-MM-dd";
	private static final String FORMAT_LONG = "yyyy-MM-dd HH:mm:ss";
	private static final String HH_MI_SS = "HH:mm:ss";
	private static final String YYYY_MM_DD_CN = "yyyy年MM月dd";
	private static final String FORMAT_LONG_CN = "yyyy年MM月dd日  HH时mm分ss秒";
	private static final int[] DAYS_OF_MONTH = { 31, 28, 31, 30, 31, 30, 31,
			31, 30, 31, 30, 31 };
	private static String[] weekDays = { "星期日", "星期一", "星期二", "星期三", "星期四",
			"星期五", "星期六" };

	public static String formatDate(Date date, String pattern) {
		String returnValue = "";
		if (date != null) {
			SimpleDateFormat df = new SimpleDateFormat(pattern);
			returnValue = df.format(date);
		}
		return returnValue;
	}

	public static Date parseDate(String strDate, String pattern) {
		SimpleDateFormat df = new SimpleDateFormat(pattern);
		try {
			return df.parse(strDate);
		} catch (ParseException e) {
			e.printStackTrace();
			return null;
		}
	}

	// 得到星期几
	public static String getWeekOfDate(Date date) {
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
		if (w < 0)
			w = 0;
		return weekDays[w];
	}

	// 判断日期是否是周六周末
	public boolean isWeekend(Date date) {
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
		return dayOfWeek == 1 || dayOfWeek == 7;
	}

	// date所处周的星期一
	public static Date getFirstDayOfWeek(Date date) {
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.setFirstDayOfWeek(Calendar.MONDAY);
		cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
		return cal.getTime();
	}

	// date所处周的星期天
	public static Date getLastDayOfWeek(Date date) {
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.setFirstDayOfWeek(Calendar.MONDAY);
		cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
		return cal.getTime();
	}

	// 得到日期月份最大的天数
	public static int getMaxDayOfMonth(int year, int month) {
		if (month == 2 && (year % 4 == 0 && year % 100 != 0 || year % 400 == 0))
			return 29;
		return DAYS_OF_MONTH[month - 1];
	}

	// 判断2个日期是否在同一天
	public static boolean isSameDay(Date date, Date date2) {
		String str = formatDate(date, YYYY_MM_DD);
		String str2 = formatDate(date2, YYYY_MM_DD);
		return str.equals(str2);
	}

	// yyyy-MM-dd 0:00:00
	//days=0 今天,-1昨天,1明天下面的都一样
	public static Date getDateStart(Date date, int days) {
		Calendar startCal = Calendar.getInstance();
		startCal.setTime(date);
		startCal.set(5, startCal.get(5) + days);
		startCal.set(11, 0);
		startCal.set(14, 0);
		startCal.set(13, 0);
		startCal.set(12, 0);
		return startCal.getTime();
	}

	// yyyy-MM-dd 23:59:59
	public static Date getDateEnd(Date date, int days) {
		Calendar endCal = Calendar.getInstance();
		endCal.setTime(date);
		endCal.set(5, endCal.get(5) + days);
		endCal.set(11, 23);
		endCal.set(14, 59);
		endCal.set(13, 59);
		endCal.set(12, 59);
		return endCal.getTime();
	}

	// yyyy-MM-1 00:00:00
	public static Date getMonthStart(Date date, int n) {
		Calendar startCal = Calendar.getInstance();
		startCal.setTime(date);
		startCal.set(5, 1);
		startCal.set(11, 0);
		startCal.set(14, 0);
		startCal.set(13, 0);
		startCal.set(12, 0);
		startCal.set(2, startCal.get(2) + n);
		return startCal.getTime();
	}

	// yyyy-MM-end 23:59:59
	public static Date getMonthEnd(Date date, int n) {
		Calendar endCal = Calendar.getInstance();
		endCal.setTime(date);
		endCal.set(5, 1);
		endCal.set(11, 23);
		endCal.set(14, 59);
		endCal.set(13, 59);
		endCal.set(12, 59);
		endCal.set(2, endCal.get(2) + n + 1);
		endCal.set(5, endCal.get(5) - 1);
		return endCal.getTime();
	}

	// yyyy-1-1 00:00:00
	public static Date getYearStart(Date date, int n) {
		Calendar startCal = Calendar.getInstance();
		startCal.setTime(date);
		startCal.set(2, 0);// JANUARY which is 0;
		startCal.set(5, 1);
		startCal.set(11, 0);
		startCal.set(12, 0);
		startCal.set(14, 0);
		startCal.set(13, 0);
		startCal.set(1, startCal.get(1) + n);
		return startCal.getTime();
	}

	// yyyy-12-31 23:59:59
	public static Date getYearEnd(Date date, int n) {
		Calendar endCal = Calendar.getInstance();
		endCal.setTime(date);
		endCal.set(2, 12);
		endCal.set(5, 1);
		endCal.set(11, 23);
		endCal.set(14, 59);
		endCal.set(13, 59);
		endCal.set(12, 59);
		endCal.set(1, endCal.get(1) + n);
		endCal.set(5, endCal.get(5) - 1);
		return endCal.getTime();
	}

	// 日期加上n个月
	public static Date addMonths(Date date, int n) {
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.add(Calendar.MONTH, n);
		return cal.getTime();
	}

	// 日期加上n天
	public static Date addDays(Date date, int n) {
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		cal.add(Calendar.DATE, n);
		return cal.getTime();
	}

	// 2个日期相差多少天
	public static long getDayDiff(Date startDate, Date endDate)
			throws ParseException {
		long t1 = startDate.getTime();
		long t2 = endDate.getTime();
		long count = (t2 - t1) / (24L * 60 * 60 * 1000);
		return Math.abs(count);
	}

	// 2个日期相差多少天 不考虑时分秒
	public static long getDayDiffIgnoreHHMISS(Date startDate, Date endDate)
			throws ParseException {
		startDate = getDateStart(startDate, 0);
		endDate = getDateStart(endDate, 0);
		long t1 = startDate.getTime();
		long t2 = endDate.getTime();
		long count = (t2 - t1) / (24L * 60 * 60 * 1000);
		return Math.abs(count);
	}

	// 2个日期相差多少年
	public static int getYearDiff(Date minDate, Date maxDate) {
		if (minDate.after(maxDate)) {
			Date tmp = minDate;
			minDate = new Date(maxDate.getTime());
			maxDate = new Date(tmp.getTime());
		}
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(minDate);
		int year1 = calendar.get(Calendar.YEAR);
		int month1 = calendar.get(Calendar.MONTH);
		int day1 = calendar.get(Calendar.DATE);

		calendar.setTime(maxDate);
		int year2 = calendar.get(Calendar.YEAR);
		int month2 = calendar.get(Calendar.MONTH);
		int day2 = calendar.get(Calendar.DATE);
		int result = year2 - year1;
		if (month2 < month1) {
			result--;
		} else if (month2 == month1 && day2 < day1) {
			result--;
		}
		return result;
	}

	// 2个日期相差多少月
	public static int getMonthDiff(Date minDate, Date maxDate) {
		if (minDate.after(maxDate)) {
			Date tmp = minDate;
			minDate = new Date(maxDate.getTime());
			maxDate = new Date(tmp.getTime());
		}
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(minDate);
		int year1 = calendar.get(Calendar.YEAR);
		int month1 = calendar.get(Calendar.MONTH);
		int day1 = calendar.get(Calendar.DATE);

		calendar.setTime(maxDate);
		int year2 = calendar.get(Calendar.YEAR);
		int month2 = calendar.get(Calendar.MONTH);
		int day2 = calendar.get(Calendar.DATE);

		int months = 0;
		if (day2 >= day1) {
			months = month2 - month1;
		} else {
			months = month2 - month1 - 1;
		}
		return (year2 - year1) * 12 + months;
	}

	// 得到2个日期之间的月份,返回值List<字符串>
	public static List<String> getMonthsBetween(Date minDate, Date maxDate) {
		ArrayList<String> result = new ArrayList<String>();
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
		if (minDate.after(maxDate)) {
			Date tmp = minDate;
			minDate = new Date(maxDate.getTime());
			maxDate = new Date(tmp.getTime());
		}
		Calendar min = Calendar.getInstance();
		Calendar max = Calendar.getInstance();
		min.setTime(minDate);
		min.set(min.get(Calendar.YEAR), min.get(Calendar.MONTH), 1);
		max.setTime(maxDate);
		max.set(max.get(Calendar.YEAR), max.get(Calendar.MONTH), 2);
		Calendar curr = min;
		while (curr.before(max)) {
			result.add(sdf.format(curr.getTime()));
			curr.add(Calendar.MONTH, 1);
		}
		return result;
	}

	/**
	 * 最近一周时间段 今天对应的上周星期n-今天
	 */
	public static Date[] getRecentWeek(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		Date to = calendar.getTime();
		calendar.set(Calendar.WEEK_OF_MONTH,
				calendar.get(Calendar.WEEK_OF_MONTH) - 1);
		Date from = calendar.getTime();
		return new Date[] { from, to };
	}

	// 最近一个月 今天对应的上月n日-今天
	public static Date[] getRecentMonth(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		Date to = calendar.getTime();
		calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) - 1);
		Date from = calendar.getTime();
		return new Date[] { from, to };
	}

	// 中文显示日期与当前时间差
	public static String friendlyFormat(Date date) throws ParseException {
		if (date == null) {
			return "未知";
		}
		Date baseDate = new Date();
		if (baseDate.before(date)) {
			return "未知";
		}
		int year = getYearDiff(baseDate, date);
		int month = getMonthDiff(baseDate, date);
		if (year >= 1) {
			return year + "年前";
		} else if (month >= 1) {
			return month + "月前";
		}
		int day = (int) getDayDiff(baseDate, date);
		if (day > 0) {
			if (day > 2) {
				return day + "天前";
			} else if (day == 2) {
				return "前天";
			} else if (day == 1) {
				return "昨天";
			}
		}
		if (!isSameDay(baseDate, date)) {
			return "昨天";
		}
		int hour = (int) ((baseDate.getTime() - date.getTime()) / (1 * 60 * 60 * 1000));
		if (hour > 6) {
			return "今天";
		} else if (hour > 0) {
			return hour + "小时前";
		}
		int minute = (int) ((baseDate.getTime() - date.getTime()) / (1 * 60 * 1000));
		if (minute < 2) {
			return "刚刚";
		} else if (minute < 30) {
			return minute + "分钟前";
		} else if (minute > 30) {
			return "半个小时以前";
		}
		return "未知";
	}
}

    

    最后一个方法没有考虑跨年日期相差3天的情况，如有需要请自行处理。

    如有错误，欢迎指出，谢谢。

    全文完。