DateFormat

GregorianCalendar cal=new GregorianCalendar()

Date date=new Date();

     Date cal.getTime();

     long  date.getTime();

//SimpleDateFormat  formatDate=new SimpleDateFormat("yyyyMMddHHmmss E");
		SimpleDateFormat  formatDate=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		GregorianCalendar cal=new GregorianCalendar();
		Date date=cal.getTime();
		
		//date转String
		String strDate=formatDate.format(date);//获取日期
		System.out.println(strDate);
		
		//String转date
		String strDate2="2012-08-29 16:23:23:333";//2012-08-29 16:28
		try {
			date=formatDate.parse(strDate2);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		System.out.println(date);//Wed Aug 29 16:23:00 CST 2012
		
		//sqlTime
		Timestamp sqlTimestamp=new Timestamp(cal.getTime().getTime());
		String strDate3=formatDate.format(sqlTimestamp);//获取日期
		System.out.println(strDate3);//2012-08-29 16:32:14:014