java如何把时间格式转为毫秒

import java.text.ParseException;import java.text.SimpleDateFormat;public class Cat { public static void main(String[] args) throws ParseException {  String str = "201104141302";  SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmm");    long millionSeconds = sdf.parse(str).getTime();//毫秒  System.out.println(millionSeconds); }}-------------------1302757320000