1.首先引入jar包

 <dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.3.7</version>
</dependency>

2.计算差值

	public static DateFormat getDateTimeFormat(){DateFormat dtf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");return dtf;}
//获取两个时间之前的差值(小时)public static String getSjScz(String rq1,String rq2)throws Exception{DateFormat simpleFormat = getDateTimeFormat();Date timeDate1 = simpleFormat.parse(rq1);Date timeDate2 = simpleFormat.parse(rq2);long hour=DateUtil.between(timeDate1, timeDate2, DateUnit.HOUR);return String.valueOf(hour);}//获取两个时间之前的差值(小时带小数)public static String getSjSch(String rq1,String rq2)throws Exception{DateFormat simpleFormat = getDateTimeFormat();Date timeDate1 = simpleFormat.parse(rq1);Date timeDate2 = simpleFormat.parse(rq2);long time1 = timeDate1.getTime();long time2 = timeDate2.getTime();double minutes = ((time1 - time2)*1.0 / (1000 * 60*60));return String.valueOf(minutes);}//获取两个时间之前的差值(分钟)public static String getSjScm(String rq1,String rq2)throws Exception{DateFormat simpleFormat = getDateTimeFormat();Date timeDate1 = simpleFormat.parse(rq1);Date timeDate2 = simpleFormat.parse(rq2);long minutes=DateUtil.between(timeDate1, timeDate2, DateUnit.MINUTE);return String.valueOf(minutes);}