1 packagecom.tongyue.hot.web;2

3 importjava.util.Calendar;4 importjava.util.Date;5 importjava.util.GregorianCalendar;6

7 public classDateutil {8

9 /**

10 * 取得当前日期是多少周11 *12 *@paramdate13 *@return

14 */

15 public static intgetWeekOfYear(Date date) {16 Calendar c = newGregorianCalendar();17 c.setFirstDayOfWeek(Calendar.MONDAY);18 c.setMinimalDaysInFirstWeek(7);19 c.setTime (date);20

21 returnc.get(Calendar.WEEK_OF_YEAR);22 }23

24 /**

25 * 得到某一年周的总数26 *27 *@paramyear28 *@return

29 */

30 public static int getMaxWeekNumOfYear(intyear) {31 Calendar c = newGregorianCalendar();32 c.set(year, Calendar.DECEMBER, 31, 23, 59, 59);33

34 returngetWeekOfYear(c.getTime());35 }36

37 /**

38 * 得到某年某周的第一天39 *40 *@paramyear41 *@paramweek42 *@return

43 */

44 public static Date getFirstDayOfWeek(int year, intweek) {45 Calendar c = newGregorianCalendar();46 c.set(Calendar.YEAR, year);47 c.set (Calendar.MONTH, Calendar.JANUARY);48 c.set(Calendar.DATE, 1);49

50 Calendar cal =(GregorianCalendar) c.clone();51 cal.add(Calendar.DATE, week * 7);52

53 returngetFirstDayOfWeek(cal.getTime ());54 }55

56 /**

57 * 得到某年某周的最后一天58 *59 *@paramyear60 *@paramweek61 *@return

62 */

63 public static Date getLastDayOfWeek(int year, intweek) {64 Calendar c = newGregorianCalendar();65 c.set(Calendar.YEAR, year);66 c.set(Calendar.MONTH, Calendar.JANUARY);67 c.set(Calendar.DATE, 1);68

69 Calendar cal =(GregorianCalendar) c.clone();70 cal.add(Calendar.DATE , week * 7);71

72 returngetLastDayOfWeek(cal.getTime());73 }74

75 /**

76 * 取得指定日期所在周的第一天77 *78 *@paramdate79 *@return

80 */

81 public staticDate getFirstDayOfWeek(Date date) {82 Calendar c = newGregorianCalendar();83 c.setFirstDayOfWeek(Calendar.MONDAY);84 c.setTime(date);85 c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); //Monday

86 returnc.getTime ();87 }88

89 /**

90 * 取得指定日期所在周的最后一天91 *92 *@paramdate93 *@return

94 */

95 public staticDate getLastDayOfWeek(Date date) {96 Calendar c = newGregorianCalendar();97 c.setFirstDayOfWeek(Calendar.MONDAY);98 c.setTime(date);99 c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); //Sunday

100 returnc.getTime();101 }102

103 /**

104 * 取得当前日期所在周的第一天105 *106 *@paramdate107 *@return

108 */

109 public staticDate getFirstDayOfWeek() {110 Calendar c = newGregorianCalendar();111 c.setFirstDayOfWeek(Calendar.MONDAY);112 c.setTime(newDate());113 c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); //Monday

114 returnc.getTime ();115 }116

117 /**

118 * 取得当前日期所在周的最后一天119 *120 *@paramdate121 *@return

122 */

123 public staticDate getLastDayOfWeek() {124 Calendar c = newGregorianCalendar();125 c.setFirstDayOfWeek(Calendar.MONDAY);126 c.setTime(newDate());127 c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); //Sunday

128 returnc.getTime();129 }130 /*

131 *132

133 public static void main(String[] args) {134 int year = 2009;135 int week = 1;136

137 // 以2006-01-02位例138 Calendar c = new GregorianCalendar();139 c.set(2009, Calendar.DECEMBER, 7);140 Date d = c.getTime();141

142 System.out.println("current date = " + d);143 System.out.println("getWeekOfYear = " + getWeekOfYear(d));144 System.out.println("getMaxWeekNumOfYear = " + getMaxWeekNumOfYear(year));145 System.out.println("getFirstDayOfWeek = " + getFirstDayOfWeek(year, week));146 System.out.println("getLastDayOfWeek = " + getLastDayOfWeek(year, week));147 System.out.println ("getFirstDayOfWeek = " + getFirstDayOfWeek(d));148 System.out.println("getLastDayOfWeek = " + getLastDayOfWeek(d));149 System.out.println ("getFirstDayOfWeek = " + getFirstDayOfWeek());150 System.out.println("getLastDayOfWeek = " + getLastDayOfWeek());151 }152 */

153 }