java获取当天，前天，明天，本周，本月，本年的开始日期时间和结束日期时间

 package demoone;

 import java.sql.Timestamp;
 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;

 public class DateUtils {
     //获取当天的开始时间
     public static java.util.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
     public static java.util.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
     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
     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
     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
     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
     public static Date getBeginDayOfWeek() {
         Date date = new Date();
         if (date == null) {
             return null;
         }
         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
     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
      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
      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
      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
      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
     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
     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
      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
      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
      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
      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
      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
      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
      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
      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
      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（间隔天数的日期集合）
      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）
      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
  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
    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();
     }

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