Java日期处理

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, 0);  //0本周，7下周，14下下周，一次类推
cal.setFirstDayOfWeek(Calendar.MONDAY);
StringBuffer buffer = new StringBuffer();
for(int i=0;i<=6;i++)
{
cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek());
buffer.append(format.format(cal.getTime())+",");
}
System.out.println(buffer.toString());

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.setTime(format.parse("2014-05-22"));
System.out.println(cal.get(Calendar.DAY_OF_WEEK)-1);