数据库查询出的开始结束时间相减，获得时间差，转为xx天xx时xx分

List<Map<String, Object>> list = jdbcTemplate.queryForList(sql); //我的list格式是list<map>类型的  可以按需自己调整

	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //规定获得的日期格式  与数据库存储的类型一致
		for (int i = 0;i<list.size();i++) {
			Object timeofend =  list.get(i).get("ENDTIME");
			if(null==timeofend||"".equals(timeofend)){ //如果结束时间为空的话直接跳过，不转化
				System.out.println("null---"+timeofend);
				list.get(i).put("timecha", ""); //要传到前台的
			}else{
				System.out.println("not null---"+timeofend);
			Date dateTimeend = sdf.parse(String.valueOf(timeofend));
			String starttime = String.valueOf(list.get(i).get("STARTTIME"));
			Date dateTimeStart =sdf.parse(starttime);
			long timecha = dateTimeend.getTime()-dateTimeStart.getTime();//获得时间差
			double daytime = Math.floor(timecha/(24 * 60 * 60 * 1000));
			int day=(int)Math.floor(daytime);//转化天
			double housess = timecha % (1000 * 60 * 60 * 24) / (1000 * 60 * 60);
			int house = (int) Math.floor(housess);//转化小时
			double mi = timecha % (1000 * 60 * 60) / (1000 * 60);
			int minutes = (int) Math.floor(mi);//转化分钟
			System.out.println(day + "天" + house + "小时" + minutes + "分");
			if(day>0){
				list.get(i).put("timecha", day + "天" + house + "小时" + minutes + "分");
			}else{
				if(house>0){
					list.get(i).put("timecha",  house + "小时" + minutes + "分");
				}else{
					list.get(i).put("timecha",  minutes + "分");
				}
				
			}