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java日期操作类


 

       类的源代码:

  Java代码

  /**

  * java日期操作(月末、周末等的日期操作)

  *

  * @author

  *

  */

  public class DateUtil {

  /** */

  /**

  * 取得某天相加(减)後的那一天

  *

  * @param date

  * @param num

  * (可正可负)

  * @return

  */

  public static Date getAnotherDate(Date date, int num) {

  Calendar c = Calendar.getInstance();

  c.setTime(date);

  c.add(Calendar.DAY_OF_YEAR, num);

  return c.getTime();

  }

  /** */

  /**

  * 取得某月的的最后一天

  *

  * @param year

  * @param month

  * @return

  */

  public static Date getLastDayOfMonth(int year, int month) {

  Calendar cal = Calendar.getInstance();

  cal.set(Calendar.YEAR, year);// 年

  cal.set(Calendar.MONTH, month - 1);// 月,因为Calendar里的月是从0开始,所以要减1

  cal.set(Calendar.DATE, 1);// 日,设为一号

  cal.add(Calendar.MONTH, 1);// 月份加一,得到下个月的一号

  cal.add(Calendar.DATE, -1);// 下一个月减一为本月最后一天

  return cal.getTime();// 获得月末是几号

  }

  /** */

  /**

  * 取得某天是一年中的多少周

  *

  * @param date

  * @return

  */

  public static int getWeekOfYear(Date date) {

  Calendar c = new GregorianCalendar();

  c.setFirstDayOfWeek(Calendar.MONDAY);

  c.setMinimalDaysInFirstWeek(7);

  c.setTime(date);

  return c.get(Calendar.WEEK_OF_YEAR);

  }

  /** */

  /**

  * 取得某天所在周的第一天

  *

  * @param date

  * @return

  */

  public static Date getFirstDayOfWeek(Date date) {

  Calendar c = new GregorianCalendar();

  c.setFirstDayOfWeek(Calendar.MONDAY);

  c.setTime(date);

  c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek());

  return c.getTime();

  }

  /** */

  /**

  * 取得某天所在周的最后一天

  *

  * @param date

  * @return

  */

  public static Date getLastDayOfWeek(Date date) {

  Calendar c = new GregorianCalendar();

  c.setFirstDayOfWeek(Calendar.MONDAY);

  c.setTime(date);

  c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6);

  return c.getTime();

  }

  /** */

  /**http://ini.iteye.com/

  * 取得某一年共有多少周

  *

  * @param year

  * @return

  */

  public static int getMaxWeekNumOfYear(int year) {

  Calendar c = new GregorianCalendar();

  c.set(year, Calendar.DECEMBER, 31, 23, 59, 59);

  return getWeekOfYear(c.getTime());

  }

  /**

  * http://ini.iteye.com/

  * 获取某一年某一周的日期

  * @description

  * @param year

  * @param week

  * @return

  */

  public static List getWeekDays(int year,int week){

  List list = new ArrayList();

  Date date = getFirstDayOfWeek(year,week);

  SimpleDateFormat d = new SimpleDateFormat("yyyy-MM-dd");

  for (int i = 0; i < 7; i++) {

  list.add(d.format(date));

  System.out.println(d.format(date));

  date.setDate(date.getDate()+1);

  }

  return list;

  }

  /** */

  /**

  * 取得某年某周的第一天 对于交叉:2008-12-29到2009-01-04属于2008年的最后一周,2009-01-05为2009年第一周的第一天

  *

  * @param year

  * @param week

  * @return

  */

  public static Date getFirstDayOfWeek(int year, int week) {

  Calendar calFirst = Calendar.getInstance();

  calFirst.set(year, 0, 7);

  Date firstDate = getFirstDayOfWeek(calFirst.getTime());

  Calendar firstDateCal = Calendar.getInstance();

  firstDateCal.setTime(firstDate);

  Calendar c = new GregorianCalendar();

  c.set(Calendar.YEAR, year);

  c.set(Calendar.MONTH, Calendar.JANUARY);

  c.set(Calendar.DATE, firstDateCal.get(Calendar.DATE));

  Calendar cal = (GregorianCalendar) c.clone();

  cal.add(Calendar.DATE, (week - 1) * 7);

  firstDate = getFirstDayOfWeek(cal.getTime());

  return firstDate;

  }

  /** */

  /**

  * 取得某年某周的最后一天 对于交叉:2008-12-29到2009-01-04属于2008年的最后一周, 2009-01-04为

  * 2008年最后一周的最后一天

  *

  * @param year

  * @param week

  * @return

  */

  public static Date getLastDayOfWeek(int year, int week) {

  Calendar calLast = Calendar.getInstance();

  calLast.set(year, 0, 7);

  Date firstDate = getLastDayOfWeek(calLast.getTime());

  Calendar firstDateCal = Calendar.getInstance();

  firstDateCal.setTime(firstDate);

  Calendar c = new GregorianCalendar();

  c.set(Calendar.YEAR, year);

  c.set(Calendar.MONTH, Calendar.JANUARY);

  c.set(Calendar.DATE, firstDateCal.get(Calendar.DATE));

  Calendar cal = (GregorianCalendar) c.clone();

  cal.add(Calendar.DATE, (week - 1) * 7);

  Date lastDate = getLastDayOfWeek(cal.getTime());

  return lastDate;

  }

  /**

  *获取当前日期的年、月、日

  */

  public void display() {

  Calendar cal = Calendar.getInstance();

  // 年

  int year = cal.get(cal.YEAR);

  // 月

  int month = cal.get(cal.MONTH) + 1;

  // 日

  int date = cal.get(cal.DATE);

  // 星期

  int today = cal.get(cal.DAY_OF_WEEK) - 1;

  }

  public static void main(String args[]){

  List listWeekDate = DateUtil.getWeekDays(2010,52);

  for(String weeks :listWeekDate){

  System.out.println("weeks:"+weeks);

  }

  }

  }