java 获取系统时间

Date date = new Date();
		String hour = new SimpleDateFormat("HH:mm:ss").format(date);//
		
		Calendar ca = Calendar.getInstance();
		ca.add(Calendar.DATE, Integer.valueOf(0));//
		date = ca.getTime();
		
		String year = new SimpleDateFormat("yyyy-MM-dd").format(date);
		String sysdate = year+" "+hour;