Java获取日期属于当年第几周详解编程语言

String today = "2013-01-14";   
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");   
Date date = null;   
try {   
    date = format.parse(today);   
} catch (ParseException e) {   
    // TODO Auto-generated catch block   
    e.printStackTrace();   
}   
   
Calendar calendar = Calendar.getInstance();   
calendar.setFirstDayOfWeek(Calendar.MONDAY);   
calendar.setTime(date);   
   
System.out.println(calendar.get(Calendar.WEEK_OF_YEAR));  

SimpleDateFormat dft = new SimpleDateFormat("yyyy-MM-dd"); 
Date beginDate = new Date(); 
Calendar date = Calendar.getInstance(); 
date.setTime(beginDate); 
date.set(Calendar.DATE, date.get(Calendar.DATE) - 1); 
Date endDate = dft.parse(dft.format(date.getTime()));

 /** 
   * 获取当前日期是星期几<br> 
   *  
   * @param dt 
   * @return 当前日期是星期几 
   */ 
   public static String getWeekOfDate(Date dt) {
　　　　//int[] weekDays = {7, 1, 2, 3, 4, 5, 6}; 
       String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"}; 
       Calendar cal = Calendar.getInstance(); 
       cal.setTime(dt); 
       int w = cal.get(Calendar.DAY_OF_WEEK) - 1; 
       if (w < 0) 
           w = 0; 
       return weekDays[w]; 
   }