dateutil.java

一个java的成熟的论坛模式

		Date dateAddHour = new Date(n);
		return dateAddHour;
	}

	/**
	 * 根据年份和周�?获取周数的开始日�?(以当年第�?���?天的�?为第�?���?)
	 * 
	 * @param year
	 *            年份
	 * @param weekCount
	 *            周数
	 * @return
	 */
	public static String getStartByAllWeek(String year, int weekCount) {
		Calendar cal = Calendar.getInstance();
		cal.set(Integer.parseInt(year), 0, 1);
		int week = cal.get(Calendar.DAY_OF_WEEK);
		cal.add(Calendar.DAY_OF_YEAR, (9 - week) + (weekCount - 1) * 7);

		return new String(cal.get(Calendar.YEAR) + "-"
				+ (cal.get(Calendar.MONTH) + 1) + "-"
				+ cal.get(Calendar.DAY_OF_MONTH));
	}

	/**
	 * 根据年份和周�?获取周数的开始日�?（以当年第一天所在的�?为第�?���?
	 * 
	 * @param year
	 *            年份
	 * @param weekCount
	 *            周数
	 * @return
	 */
	public static String getStartByFirstDay(String year, int weekCount) {
		return getStartByAllWeek(year, weekCount - 1);
	}

	/**
	 * 根据传入的年数获取当前年的前后年的下拉列�?
	 * 
	 * @param yearCount
	 *            显示年数
	 * @return
	 */
	public static String[] getYearlist(int yearCount) {
		return getYearlist(yearCount, 0);
	}

	/**
	 * 根据传入的年数获取当前年的前后年的下拉列�?
	 * 
	 * @param yearCount
	 *            显示年数
	 * @param addCount
	 *            显示选择的年份是当前年的前后addCount年，如－1为前�?���?为后�?���?为当前年
	 * @return
	 */
	public static String[] getYearlist(int yearCount, int addCount) {
		String yearList[] = new String[yearCount];
		java.util.Date date = new Date();
		String select = "";
		int year = DateUtil.getYear(date) - yearCount / 2;
		for (int i = 0; i < yearCount; i++) {
			if (i == yearCount / 2 + addCount)
				select = "selected";
			yearList[i] = "<option " + select + ">" + year + "</option>";
			// System.out.println(yearList[i]);
			select = "";
			year++;
		}
		return yearList;
	}

	public static int getWeekName(java.util.Date date) {
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		int i = c.get(Calendar.DAY_OF_WEEK);
		if (i == 1)
			return 7;
		if (i == 2)
			return 1;
		if (i == 3)
			return 2;
		if (i == 4)
			return 3;
		if (i == 5)
			return 4;
		if (i == 6)
			return 5;
		if (i == 7)
			return 6;
		return 0;

	}

	/**
	 * 获取星期�?
	 * 
	 * @return
	 */
	public static int getWeekName() {
		return getWeekName(new java.util.Date());
	}

	/**
	 * 根据年月日获取星�?
	 * 
	 * @param year
	 * @param month
	 * @return
	 */
	public static int getDayByYearMonthDay(int year, int month, int day) {
		int retVal = 0;
		java.util.Calendar calendar = java.util.Calendar.getInstance();
		calendar.set(java.util.Calendar.YEAR, year);
		calendar.set(java.util.Calendar.MONTH, month - 1);
		calendar.set(java.util.Calendar.DATE, day);
		// java.text.DateFormat format=new
		// java.text.SimpleDateFormat("yyyy-MM-dd HH:MM:ss");
		// System.out.println(format.format(calendar.getTime()));
		int dayOfWeek = calendar.get(java.util.Calendar.DAY_OF_WEEK);
		switch (dayOfWeek) {
		case 1:
			retVal = 7;
			break;
		case 2:
			retVal = 1;
			break;
		case 3:
			retVal = 2;
			break;
		case 4:
			retVal = 3;
			break;
		case 5:
			retVal = 4;
			break;
		case 6:
			retVal = 5;
			break;
		case 7:
			retVal = 6;
			break;
		}
		return retVal;
	}

	/**
	 * 将字符串的日期转换成yy-MM-dd型的字符�?
	 * 
	 * @param str
	 * @return
	 */
	public static String getStrDateByStr(String str) {
		if (str == null || str.equals("")) {
			return "";
		} else {
			Date date = DateUtil.convertStrToDate(str);
			return DateUtil.getDateString(date);

		}
	}

	/**
	 * 获取年月日时分秒的字符串
	 * 
	 * @param time
	 * @return
	 */
	public static String getStrTrueDateByStr(String str) {
		String date = "";
		if (str != null && !str.equals("")) {
			date = DateUtil.getDateString((convertStrToDate(str,
					"yyyy-MM-dd HH:mm:ss")), "yyyy-MM-dd HH:mm:ss");
		}
		return date;

	}

	/**
	 * 判断日期离现在日期是否超�?�?
	 * 
	 * @param time
	 * @return
	 */
	public static boolean isTimeout(String time) {
		Date date = DateUtil.convertStrToDate(time);
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		Calendar thisDate = Calendar.getInstance();
		thisDate.add(Calendar.DAY_OF_MONTH, -7);
		boolean isTimeout = thisDate.after(c);
		return isTimeout;
	}

	/**
	 * 给定的日期字符串增加或减少几�?
	 * 
	 * @param day
	 *            增加天数为正数，减少为负�?
	 */
	public static String getAddDateStr(String date, int day) {
		Calendar c = Calendar.getInstance();
		c.setTime(DateUtil.convertStrToDate(date));
		c.add(Calendar.DAY_OF_MONTH, day);
		return DateUtil.getDateString(c.getTime());
	}

	/**
	 * 判断两个日期字符串的大小,返回大的�?��
	 */
	public static String compareDateStr(String date1, String date2) {

		int year1 = DateUtil.getYear(convertStrToDate(date1));
		int month1 = DateUtil.getMonth(convertStrToDate(date1));
		int day1 = DateUtil.getDay(convertStrToDate(date1));
		int year2 = DateUtil.getYear(convertStrToDate(date2));
		int month2 = DateUtil.getMonth(convertStrToDate(date2));
		int day2 = DateUtil.getDay(convertStrToDate(date2));
		if (year1 > year2) {
			return date1;
		} else {
			if (year1 == year2) {
				if (month1 > month2) {
					return date1;
				} else {
					if (month1 == month2) {
						if (day1 > day2) {
							return date1;
						} else {
							if (day1 == day2) {
								return null;
							} else {
								return date2;
							}
						}
					} else {
						return date2;
					}
				}
			} else {
				return date2;
			}
		}
	}

	/**
	 * 得到两天日期之间的每天的日期
	 * 
	 * @param startDate
	 * @param endDate
	 * @return
	 */
	public static String[] dispatchTwoDate(String startDate, String endDate,
			String thisDate) {
		if (startDate == null && endDate == null && thisDate == null) {
			return null;
		}
		if (thisDate != null && !thisDate.equals("")) {
			return new String[] { thisDate };
		}
		Date sDate = null;
		Date eDate = null;
		if (startDate != null && !startDate.equals(""))
			sDate = DateUtil.convertStrToDate(startDate);
		if (endDate != null && !endDate.equals(""))
			eDate = DateUtil.convertStrToDate(endDate);
		int dispatchDay = (int) ((eDate.getTime() - sDate.getTime()) / (1000 * 60 * 60 * 24));
		// System.out.println(dispatchDay);
		String[] dateStr = new String[dispatchDay + 1];
		Calendar c = Calendar.getInstance();
		c.setTime(sDate);
		dateStr[0] = DateUtil.getDateString(sDate);
		// System.out.println("dateStr[0] "+dateStr[0]);
		for (int i = 1; i < dispatchDay + 1; i++) {
			c.add(Calendar.DAY_OF_MONTH, i);
			dateStr[i] = DateUtil.getDateString(c.getTime());
			// System.out.println("dateStr["+i+"] "+dateStr[i]);
			c.setTime(sDate);
		}
		return dateStr;
	}
	
	/**
	 * 判断两个日期中间相差的年�?
	 */
	public static int discrepancyYearWithDate(Date date1,Date date2){
		long disTime = 0;
		System.out.println("date1 time :  "+date1.getTime());
		System.out.println("date2 time :  "+date2.getTime());
		if(date1.getTime() - date2.getTime()>0){
			disTime = ((long)date1.getTime()-(long)date2.getTime());
		}else{
			disTime = ((long)date2.getTime()-(long)date1.getTime());
		}
		return (int)disTime;
	}
	
	public static java.sql.Date StringToDate(String param) {
        if (param == null) {
            return null;
        } else {
            java.util.Date date = null;
            try {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                date = sdf.parse(param);
                return (java.sql.Date) new Date(date.getTime());
            } catch (ParseException ex) {
                //ex.printStackTrace();
                return null;
            }
        }
    }
	
	
	
	public static void main(String arg[]){
		Calendar c1 = Calendar.getInstance();
		c1.set(2005, 12, 11);
		Calendar c2 = Calendar.getInstance();
		c2.setTime(new Date());
		//System.out.println(DateUtil.discrepancyYearWithDate(c1.getTime(), c2.getTime()));
	}
}