计算时间差获取大概的时间 如：多少秒前，多少分钟前

	public  static String formationDate(Date date) {
		String dateString = "";
		// 获取系统当前时间
		 Date now = new Date();
		 try {
			long endTime = now.getTime(); 
			 long currentTime= date.getTime(); 
			 // 计算两个时间点相差的秒数
			 long seconds = (endTime - currentTime);
			 if (seconds<10*1000) {
				 dateString ="刚刚";
			}else if (seconds<60*1000) {
				 dateString = seconds/1000+"秒前";
			}else if (seconds<60*60*1000) {
				 dateString = seconds/1000/60+"分钟前";
			}else if (seconds<60*60*24*1000) {
				 dateString = seconds/1000/60/60+"小时前";
			}else if (seconds<60*60*24*1000*30L) {
				 dateString =seconds/1000/60/60/24+ "天前";
			}else if (date.getYear()==now.getYear()) {//今年并且大于30天显示具体月日
				dateString = new SimpleDateFormat("MM-dd").format(date.getTime());
			}else if (date.getYear()!=now.getYear()) {//大于今年显示年月日
				 dateString =  new SimpleDateFormat("yyyy-MM-dd").format(date.getTime());
			}else{
				 dateString =  new SimpleDateFormat("yyyy-MM-dd").format(date);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		  
		return dateString;
	   
	}