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  • JAVA中用CALENDAR类计算周和周的起始日期(转)

    转:http://407827531.iteye.com/blog/1457316

    public class Dateutil {

     /** 
     * 取得当前日期是多少周 
     * 
     * @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); 
     }

     /** 
     * 得到某一年周的总数 
     * 
     * @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()); 
     }

     /** 
     * 得到某年某周的第一天 
     * 
     * @param year 
     * @param week 
     * @return 
     */ 
     public static Date getFirstDayOfWeek(int year, int week) { 
     Calendar c = new GregorianCalendar(); 
     c.set(Calendar.YEAR, year); 
     c.set (Calendar.MONTH, Calendar.JANUARY); 
     c.set(Calendar.DATE, 1);

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

     return getFirstDayOfWeek(cal.getTime ()); 
     }

     /** 
     * 得到某年某周的最后一天 
     * 
     * @param year 
     * @param week 
     * @return 
     */ 
     public static Date getLastDayOfWeek(int year, int week) { 
     Calendar c = new GregorianCalendar(); 
     c.set(Calendar.YEAR, year); 
     c.set(Calendar.MONTH, Calendar.JANUARY); 
     c.set(Calendar.DATE, 1);

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

     return getLastDayOfWeek(cal.getTime()); 
     }

     /** 
     * 取得指定日期所在周的第一天 
     * 
     * @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()); // Monday 
     return c.getTime (); 
     }

     /** 
     * 取得指定日期所在周的最后一天 
     * 
     * @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); // Sunday 
     return c.getTime(); 
     } 
     
     /** 
     * 取得当前日期所在周的第一天 
     * 
     * @param date 
     * @return 
     */ 
     public static Date getFirstDayOfWeek() { 
     Calendar c = new GregorianCalendar(); 
     c.setFirstDayOfWeek(Calendar.MONDAY); 
     c.setTime(new Date()); 
     c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); // Monday 
     return c.getTime (); 
     }

     /** 
     * 取得当前日期所在周的最后一天 
     * 
     * @param date 
     * @return 
     */ 
     public static Date getLastDayOfWeek() { 
     Calendar c = new GregorianCalendar(); 
     c.setFirstDayOfWeek(Calendar.MONDAY); 
     c.setTime(new Date()); 
     c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday 
     return c.getTime(); 
     } 
     /*
      * 
      
     public static void main(String[] args) { 
      int year = 2009; 
      int week = 1;

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

      System.out.println("current date = " + d); 
      System.out.println("getWeekOfYear = " + getWeekOfYear(d)); 
      System.out.println("getMaxWeekNumOfYear = " + getMaxWeekNumOfYear(year)); 
      System.out.println("getFirstDayOfWeek = " + getFirstDayOfWeek(year, week)); 
      System.out.println("getLastDayOfWeek = " + getLastDayOfWeek(year, week)); 
      System.out.println ("getFirstDayOfWeek = " + getFirstDayOfWeek(d)); 
      System.out.println("getLastDayOfWeek = " + getLastDayOfWeek(d)); 
      System.out.println ("getFirstDayOfWeek = " + getFirstDayOfWeek()); 
      System.out.println("getLastDayOfWeek = " + getLastDayOfWeek()); 
      }
     */ 
    }

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  • 原文地址:https://www.cnblogs.com/anuoruibo/p/2618057.html
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