获取一年中按星期归类（星期一、星期二...）所有日期

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public static Map<String,List<Date>> getDatesByWeek(){

Calendar c_begin = new GregorianCalendar();
Calendar c_end = new GregorianCalendar();
DateFormatSymbols dfs = new DateFormatSymbols();
String[] weeks = dfs.getWeekdays();
int year = DateUtil.getYear();
int month = DateUtil.getMonth();
int day = DateUtil.getToDayOfMonth();
c_begin.set(year, month, day); //Calendar的月从0-11，
c_end.set(year, 11, 31); //Calendar的月从0-11，
List<Date> scheduledDates=new ArrayList<Date>();
Map<String,List<Date>> map = new HashMap<String, List<Date>>();
int count = 1;
c_end.add(Calendar.DAY_OF_YEAR, 1); //结束日期下滚一天是为了包含最后一天

while(c_begin.before(c_end)){
// System.out.println("第"+count+"周日期："+new java.sql.Date(c_begin.getTime().getTime())+","+weeks[c_begin.get(Calendar.DAY_OF_WEEK)]);
String DAY_OF_WEEK=weeks[c_begin.get(Calendar.DAY_OF_WEEK)];

Date date = c_begin.getTime();
if(!map.containsKey(DAY_OF_WEEK)){
map.put(DAY_OF_WEEK, new ArrayList<Date>());
}
map.get(DAY_OF_WEEK).add(date);

if(c_begin.get(Calendar.DAY_OF_WEEK)==Calendar.SUNDAY){
count++;
}
c_begin.add(Calendar.DAY_OF_YEAR, 1);
}
return map;
}

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