分享一个时间工具类

分享一个时间Java工具类

• 获取格式化输出
• 获取当天开始/结束时间
• 获取昨天开始/结束时间
• 获取明天开始/结束时间
• 得到N天之后的日期
• 获取本周的开始/结束时间
• 获取本月的开始/结束时间
• 获取本年的开始/结束时间
• 获取今年是哪一年
• 获取本月是哪一月
• 获取某年某月到某年某月按天的切片日期集合
• 获取某年某月按天切片日期集合
• 获取某年某月的第一天日期
• 获取某年某月的最后一天日期
• ……..

package top.lrshuai.blog.util;

import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
/**
 * 
 * @author rstyro
 *
 */
public class DateUtil {
	private final static SimpleDateFormat sdfYear = new SimpleDateFormat("yyyy");

	private final static SimpleDateFormat sdfDay = new SimpleDateFormat(
			"yyyy-MM-dd");
	
	private final static SimpleDateFormat sdfDays = new SimpleDateFormat(
	"yyyyMMdd");

	private final static SimpleDateFormat sdfTime = new SimpleDateFormat(
			"yyyy-MM-dd HH:mm:ss");

	/**
	 * 获取YYYY格式
	 * 
	 * @return
	 */
	public static String getYear() {
		return sdfYear.format(new Date());
	}

	/**
	 * 获取YYYY-MM-DD格式
	 * 
	 * @return
	 */
	public static String getDay() {
		return sdfDay.format(new Date());
	}
	
	/**
	 * 获取YYYYMMDD格式
	 * 
	 * @return
	 */
	public static String getDays(){
		return sdfDays.format(new Date());
	}

	/**
	 * 获取YYYY-MM-DD HH:mm:ss格式
	 * 
	 * @return
	 */
	public static String getTime() {
		return sdfTime.format(new Date());
	}

	/**
	* @Title: compareDate
	* @Description: TODO(日期比较，如果s>=e 返回true 否则返回false)
	* @param s
	* @param e
	* @return boolean  
	* @throws
	* @author luguosui
	 */
	public static boolean compareDate(String s, String e) {
		if(fomatDate(s)==null||fomatDate(e)==null){
			return false;
		}
		return fomatDate(s).getTime() >=fomatDate(e).getTime();
	}

	/**
	 * 格式化日期
	 * 
	 * @return
	 */
	public static Date fomatDate(String date) {
		DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
		try {
			return fmt.parse(date);
		} catch (ParseException e) {
			e.printStackTrace();
			return null;
		}
	}
	
	/**
	 * 格式化日期
	 * @param date 时间
	 * @param format 格式化格式
	 * @return
	 */
	public static String fomatDate(Date date,String format) {
		DateFormat fmt = new SimpleDateFormat(format);
		try {
			return fmt.format(date);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}
	

	/**
	 * 校验日期是否合法
	 * 
	 * @return
	 */
	public static boolean isValidDate(String s) {
		DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
		try {
			fmt.parse(s);
			return true;
		} catch (Exception e) {
			// 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
			return false;
		}
	}
	public static int getDiffYear(String startTime,String endTime) {
		DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
		try {
			int years=(int) (((fmt.parse(endTime).getTime()-fmt.parse(startTime).getTime())/ (1000 * 60 * 60 * 24))/365);
			return years;
		} catch (Exception e) {
			// 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
			return 0;
		}
	}
	  /**
     * <li>功能描述：时间相减得到天数
     * @param beginDateStr
     * @param endDateStr
     * @return
     * long 
     * @author Administrator
     */
    public static long getDaySub(String beginDateStr,String endDateStr){
        long day=0;
        java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");
        java.util.Date beginDate = null;
        java.util.Date endDate = null;
        
            try {
				beginDate = format.parse(beginDateStr);
				endDate= format.parse(endDateStr);
			} catch (ParseException e) {
				e.printStackTrace();
			}
            day=(endDate.getTime()-beginDate.getTime())/(24*60*60*1000);
            //System.out.println("相隔的天数="+day);
      
        return day;
    }
    
    /**
     * 得到n天之后的日期
     * @param days
     * @return
     */
    public static String getAfterDayDate(String days) {
    	int daysInt = Integer.parseInt(days);
    	
        Calendar canlendar = Calendar.getInstance(); // java.util包
        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
        Date date = canlendar.getTime();
        
        SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String dateStr = sdfd.format(date);
        
        return dateStr;
    }
    
    /**
     * 得到n天之后是周几
     * @param days
     * @return
     */
    public static String getAfterDayWeek(String days) {
    	int daysInt = Integer.parseInt(days);
    	
        Calendar canlendar = Calendar.getInstance(); // java.util包
        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
        Date date = canlendar.getTime();
        
        SimpleDateFormat sdf = new SimpleDateFormat("E");
        String dateStr = sdf.format(date);
        
        return dateStr;
    }
    
    /**
	 *  获取当天的开始时间
	 * @return
	 */
	public static Date getDayBegin() {
		Calendar cal = new GregorianCalendar();
		cal.set(Calendar.HOUR_OF_DAY, 0);
		cal.set(Calendar.MINUTE, 0);
		cal.set(Calendar.SECOND, 0);
		cal.set(Calendar.MILLISECOND, 0);
		return cal.getTime();
	}

	/**
	 *  获取当天的结束时间
	 * @return
	 */
	public static Date getDayEnd() {
		Calendar cal = new GregorianCalendar();
		cal.set(Calendar.HOUR_OF_DAY, 23);
		cal.set(Calendar.MINUTE, 59);
		cal.set(Calendar.SECOND, 59);
		return cal.getTime();
	}

	/**
	 *  获取昨天的开始时间
	 * @return
	 */
	public static Date getBeginDayOfYesterday() {
		Calendar cal = new GregorianCalendar();
		cal.setTime(getDayBegin());
		cal.add(Calendar.DAY_OF_MONTH, -1);
		return cal.getTime();
	}

	/**
	 *  获取昨天的结束时间
	 * @return
	 */
	public static Date getEndDayOfYesterDay() {
		Calendar cal = new GregorianCalendar();
		cal.setTime(getDayEnd());
		cal.add(Calendar.DAY_OF_MONTH, -1);
		return cal.getTime();
	}

	/**
	 *  获取明天的开始时间
	 * @return
	 */
	public static Date getBeginDayOfTomorrow() {
		Calendar cal = new GregorianCalendar();
		cal.setTime(getDayBegin());
		cal.add(Calendar.DAY_OF_MONTH, 1);

		return cal.getTime();
	}

	/**
	 *  获取明天的结束时间
	 * @return
	 */
	public static Date getEndDayOfTomorrow() {
		Calendar cal = new GregorianCalendar();
		cal.setTime(getDayEnd());
		cal.add(Calendar.DAY_OF_MONTH, 1);
		return cal.getTime();
	}

	/**
	 * 获取本周的开始时间
	 * @return
	 */
	public static Date getBeginDayOfWeek() {
		Date date = new Date();
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
		if (dayofweek == 1) {
			dayofweek += 7;
		}
		cal.add(Calendar.DATE, 2 - dayofweek);
		return getDayStartTime(cal.getTime());
	}

	/**
	 *  获取本周的结束时间
	 * @return
	 */
	public static Date getEndDayOfWeek() {
		Calendar cal = Calendar.getInstance();
		cal.setTime(getBeginDayOfWeek());
		cal.add(Calendar.DAY_OF_WEEK, 6);
		Date weekEndSta = cal.getTime();
		return getDayEndTime(weekEndSta);
	}

	/**
	 *  获取本月的开始时间
	 * @return
	 */
	public static Date getBeginDayOfMonth() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(getNowYear(), getNowMonth() - 1, 1);
		return getDayStartTime(calendar.getTime());
	}

	/**
	 *  获取本月的结束时间
	 * @return
	 */
	public static Date getEndDayOfMonth() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(getNowYear(), getNowMonth() - 1, 1);
		int day = calendar.getActualMaximum(5);
		calendar.set(getNowYear(), getNowMonth() - 1, day);
		return getDayEndTime(calendar.getTime());
	}

	/**
	 *  获取本年的开始时间
	 * @return
	 */
	public static java.util.Date getBeginDayOfYear() {
		Calendar cal = Calendar.getInstance();
		cal.set(Calendar.YEAR, getNowYear());
		// cal.set
		cal.set(Calendar.MONTH, Calendar.JANUARY);
		cal.set(Calendar.DATE, 1);

		return getDayStartTime(cal.getTime());
	}

	/**
	 *  获取本年的结束时间
	 * @return
	 */
	public static java.util.Date getEndDayOfYear() {
		Calendar cal = Calendar.getInstance();
		cal.set(Calendar.YEAR, getNowYear());
		cal.set(Calendar.MONTH, Calendar.DECEMBER);
		cal.set(Calendar.DATE, 31);
		return getDayEndTime(cal.getTime());
	}

	/**
	 *  获取某个日期的开始时间
	 * @param d
	 * @return
	 */
	public static Timestamp getDayStartTime(Date d) {
		Calendar calendar = Calendar.getInstance();
		if (null != d)
			calendar.setTime(d);
		calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 0,
				0, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		return new Timestamp(calendar.getTimeInMillis());
	}

	/**
	 *  获取某个日期的结束时间
	 * @param d
	 * @return
	 */
	public static Timestamp getDayEndTime(Date d) {
		Calendar calendar = Calendar.getInstance();
		if (null != d)
			calendar.setTime(d);
		calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 23,
				59, 59);
		calendar.set(Calendar.MILLISECOND, 999);
		return new Timestamp(calendar.getTimeInMillis());
	}

	/**
	 *  获取今年是哪一年
	 * @return
	 */
	public static Integer getNowYear() {
		Date date = new Date();
		GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
		gc.setTime(date);
		return Integer.valueOf(gc.get(1));
	}

	/**
	 *  获取本月是哪一月
	 * @return
	 */
	public static int getNowMonth() {
		Date date = new Date();
		GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
		gc.setTime(date);
		return gc.get(2) + 1;
	}

	/**
	 * 两个日期相减得到的天数
	 * @param beginDate
	 * @param endDate
	 * @return
	 */
	public static int getDiffDays(Date beginDate, Date endDate) {

		if (beginDate == null || endDate == null) {
			throw new IllegalArgumentException("getDiffDays param is null!");
		}

		long diff = (endDate.getTime() - beginDate.getTime()) / (1000 * 60 * 60 * 24);

		int days = new Long(diff).intValue();

		return days;
	}

	/**
	 * 两个日期相减得到的毫秒数
	 * @param beginDate
	 * @param endDate
	 * @return
	 */
	public static long dateDiff(Date beginDate, Date endDate) {
		long date1ms = beginDate.getTime();
		long date2ms = endDate.getTime();
		return date2ms - date1ms;
	}

	/**
	 *  获取两个日期中的最大日期
	 * @param beginDate
	 * @param endDate
	 * @return
	 */
	public static Date max(Date beginDate, Date endDate) {
		if (beginDate == null) {
			return endDate;
		}
		if (endDate == null) {
			return beginDate;
		}
		if (beginDate.after(endDate)) {
			return beginDate;
		}
		return endDate;
	}

	/**
	 *  获取两个日期中的最小日期
	 * @param beginDate
	 * @param endDate
	 * @return
	 */
	public static Date min(Date beginDate, Date endDate) {
		if (beginDate == null) {
			return endDate;
		}
		if (endDate == null) {
			return beginDate;
		}
		if (beginDate.after(endDate)) {
			return endDate;
		}
		return beginDate;
	}

	/**
	 *  返回某月该季度的第一个月
	 * @param date
	 * @return
	 */
	public static Date getFirstSeasonDate(Date date) {
		final int[] SEASON = { 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4 };
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int sean = SEASON[cal.get(Calendar.MONTH)];
		cal.set(Calendar.MONTH, sean * 3 - 3);
		return cal.getTime();
	}

	/**
	 *  返回某个日期下几天的日期
	 * @param date
	 * @param i
	 * @return
	 */
	public static Date getNextDay(Date date, int i) {
		Calendar cal = new GregorianCalendar();
		cal.setTime(date);
		cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);
		return cal.getTime();
	}

	/**
	 * 返回某个日期前几天的日期
	 * @param date
	 * @param i
	 * @return
	 */
	public static Date getFrontDay(Date date, int i) {
		Calendar cal = new GregorianCalendar();
		cal.setTime(date);
		cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);
		return cal.getTime();
	}

	/**
	 *  获取某年某月到某年某月按天的切片日期集合（间隔天数的集合）
	 * @param beginYear
	 * @param beginMonth
	 * @param endYear
	 * @param endMonth
	 * @param k
	 * @return
	 */
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static List getTimeList(int beginYear, int beginMonth, int endYear, int endMonth, int k) {
		List list = new ArrayList();
		if (beginYear == endYear) {
			for (int j = beginMonth; j <= endMonth; j++) {
				list.add(getTimeList(beginYear, j, k));

			}
		} else {
			{
				for (int j = beginMonth; j < 12; j++) {
					list.add(getTimeList(beginYear, j, k));
				}

				for (int i = beginYear + 1; i < endYear; i++) {
					for (int j = 0; j < 12; j++) {
						list.add(getTimeList(i, j, k));
					}
				}
				for (int j = 0; j <= endMonth; j++) {
					list.add(getTimeList(endYear, j, k));
				}
			}
		}
		return list;
	}

	/**
	 *  获取某年某月按天切片日期集合（某个月间隔多少天的日期集合）
	 * @param beginYear
	 * @param beginMonth
	 * @param k
	 * @return
	 */
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static List getTimeList(int beginYear, int beginMonth, int k) {
		List list = new ArrayList();
		Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1);
		int max = begincal.getActualMaximum(Calendar.DATE);
		for (int i = 1; i < max; i = i + k) {
			list.add(begincal.getTime());
			begincal.add(Calendar.DATE, k);
		}
		begincal = new GregorianCalendar(beginYear, beginMonth, max);
		list.add(begincal.getTime());
		return list;
	}

	/**
	 *  获取某年某月的第一天日期
	 * @param year
	 * @param month
	 * @return
	 */
	public static Date getStartMonthDate(int year, int month) {
		Calendar calendar = Calendar.getInstance();
		calendar.set(year, month - 1, 1);
		return calendar.getTime();
	}

	/**
	 * 获取某年某月的最后一天日期
	 * @param year
	 * @param month
	 * @return
	 */
	public static Date getEndMonthDate(int year, int month) {
		Calendar calendar = Calendar.getInstance();
		calendar.set(year, month - 1, 1);
		int day = calendar.getActualMaximum(5);
		calendar.set(year, month - 1, day);
		return calendar.getTime();
	}
    
    public static void main(String[] args) {
    	System.out.println(getDays());
    	System.out.println(getAfterDayWeek("3"));
    	System.out.println(fomatDate(getBeginDayOfYesterday(), "yyyy-MM-dd"));
    	System.out.println(getTimeList(2017, 1, 7));
    	System.out.println(getTimeList(2016, 1, 2017, 1, 7));
    }

}