输出数字2016-10-31 15:39:58.188是Timestamp类型 ，sql拼装

 /**  * 上月最后一天 * @throws ParseException   */ @SuppressWarnings("deprecation")@Test public void testGetMonthLastDay() throws ParseException{     Timestamp timestamp=null;     Calendar calendar = Calendar.getInstance();     calendar.set(Calendar.DAY_OF_MONTH, 1);      calendar.add(Calendar.DATE, -1);     calendar.getTimeInMillis();     SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.s");     System.out.println( new Timestamp(calendar.getTimeInMillis()));     }