Ceiling of a number in JSTL/EL

Question

In JSTL,

<fmt:formatNumber value="${1.6}" type="number" pattern="#"/>

returns 2 and the following

<fmt:formatNumber value="${1.4}" type="number" pattern="#"/>

returns1 and I need 2, a ceiling of a number.

Is there a direct way to achieve this in JSTL (or the only way to do so is by using an appropriate custom tag)?

score 21 · Accepted Answer · edited Dec 15 '16 at 16:02

21

The default rounding mode of DecimalFormat that is used by <fmt:formatNumber> is RoundingMode.HALF_EVEN. There is no way to change that via any tag attribute. Just add 0.5 to the value when it's not an odd integer to make it to behave like RoundingMode.CEILING.

<fmt:formatNumber value="${bean.number + (bean.number % 1 == 0 ? 0 : 0.5)}" 
    type="number" pattern="#" />

edited Dec 15 '16 at 16:02

Parker

answered Jul 31 '12 at 14:21

BalusC

score 5 · Answer 2 · answered Jul 31 '12 at 08:03

5

Try this code:

<fmt:formatNumber value="${N+(1-(N%1))%1}" type="number" pattern="#"/>

where N is the name of your variable.

Regards

answered Jul 31 '12 at 08:03

esmoreno

The good thing of this method is that you can easily turn it into floor rounding just by changing it to `${N-(1-(N%1))%1}`. – AxeEffect Feb 06 '14 at 16:49
1

don't you mean ${N-(N%1)} @AxeEffect ? – kacpr Jul 12 '16 at 15:14

2 Answers2