public class DateUtils {

    /**     * 获取两个日期之间的所有日期     */    public static List<Date> getBetweenDates(Date begin, Date end) {        List<Date> result = new ArrayList<Date>();        Calendar tempStart = Calendar.getInstance();        tempStart.setTime(begin);        while(begin.getTime()<=end.getTime()){            result.add(tempStart.getTime());            tempStart.add(Calendar.DAY_OF_YEAR, 1);            begin = tempStart.getTime();        }        return result;    }

    /**     * 获取当天 前几天的日期-1 2019-04-21 11:59:59     * @return fewDays     */    public static String getBeforeDay(String fewDays){        int days = Integer.valueOf(fewDays).intValue();        days = days +1;        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd 00:00:00");        //获取日历实例        Calendar calendar = Calendar.getInstance();        calendar.setTime(new Date());        //设置为前几天        calendar.add(Calendar.DAY_OF_MONTH, -days);        return sdf.format(calendar.getTime());    }

    /**     * 获取当天 前一天的日期 2019-04-21 11:59:59     * @return fewDays     */    public static String getBeforeOneDay(){        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd 23:59:59");        //获取日历实例        Calendar calendar = Calendar.getInstance();        calendar.setTime(new Date());        //设置为前几天        calendar.add(Calendar.DAY_OF_MONTH, -1);        return sdf.format(calendar.getTime());    }

    /**     * 获取当前年度     * @author: donghaijian     * @return     */    public static String getCurrentYear() {        SimpleDateFormat sdf = new SimpleDateFormat("yyyy");        Date date = new Date();        return sdf.format(date);    }

public static String parseDateToString(String pattern, Date date) {   SimpleDateFormat sdf = new SimpleDateFormat(pattern);   return sdf.format(date);}

private static Date parseStringToDate(String pattern, String dateTime) {   SimpleDateFormat sdf = new SimpleDateFormat(pattern);   try {      return sdf.parse(dateTime);   } catch (ParseException e) {      log.error(e.getMessage(), e);      return null;   }}

public static boolean parseWeChatDate(String date) {   if(date.length() != 8){      return true;   }   try {      Integer.parseInt(date);   } catch (Exception e) {      log.error(e.getMessage(), e);      return true;   }   return false;}

/** * 将一个字符串用给定的格式转换为日期类型。<br> * 注意：如果返回null，则表示解析失败 * * @param datestr *            需要解析的日期字符串 * @param pattern *            日期字符串的格式，默认为“yyyy-MM-dd”的形式 * @return 解析后的日期 */public static Date parse(String datestr, String pattern) {   Date date = null;   if (null == pattern || "".equals(pattern)) {      pattern = YYYY_MM_DD;   }   try {      SimpleDateFormat dateFormat = new SimpleDateFormat(pattern);      date = dateFormat.parse(datestr);   } catch (ParseException e) {   }   return date;}

/** * 获取指定时间N天前或者N天后的 日期 * @param date 指定时间 * @param n 正数后 负数前 * @return date */public static Date getNday(Date date, int n) {   Calendar calendar = Calendar.getInstance();   calendar.setTime(date);   calendar.add(Calendar.DATE, n);   return calendar.getTime();}

}