Java日期

SimpleDateFormat sdf = null;

if(a.equals("m")){
    sdf = new SimpleDateFormat("yyyy-MM");
    map.put("takeEnd",sdf.format(new Date()));
}else{
    sdf = new SimpleDateFormat("yyyy");
    map.put("takeEnd",sdf.format(new Date()));
}

Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, -9);

map.put("takeDate",sdf.format(calendar.getTime()));