Java中String与Timestamp,Date转换

SimpleDateFormat simple = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Date date1= null;
		try {
			date1 = simple.parse("2011-04-16 01:48:00.00");
		} catch (ParseException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		String str = simple .format(date1);
		Timestamp tamp = Timestamp.valueOf(str);