public static void main(String[] args){
	//1.通过Util包中的Date获取
	Date date = new Date();
	SimpleDateFormat dateFormat= new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
	System.out.println(dateFormat.format(date));
	//2.通过Util包的Calendar 获取
	Calendar calendar= Calendar.getInstance();
	SimpleDateFormat dateFormat1= new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
	System.out.println(dateFormat1.format(calendar.getTime()));
	//3.通过Util包的Calendar 获取时间，分别获取年月日时分秒
	Calendar cal=Calendar.getInstance();      
	int y=cal.get(Calendar.YEAR);      
	int m=cal.get(Calendar.MONTH);//当前月份的前一个月    
	int d=cal.get(Calendar.DATE);      
	int h=cal.get(Calendar.HOUR_OF_DAY);      
	int mi=cal.get(Calendar.MINUTE);      
	int s=cal.get(Calendar.SECOND);      
	System.out.println("现在时刻是"+y+"年"+m+"月"+d+"日"+h+"时"+mi+"分"+s+"秒");
}

Date date = new Date();
 SimpleDateFormat dateFormat= new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);
 System.out.println(dateFormat.format(date));