How to find length of an integer in JSP?

问题

I can use fn:length(mystring) to find the length/number of character of a string.

How can I find the length/number of digits in an integer?

e.g. if my int is 3000, I want to return 4.

回答1:

Convert it to String first by evaluating it as body of <c:set>:

<c:set var="intAsString">${someInt}</c:set>

Then you can get its length the usual way:

${fn:length(intAsString)}

来源：https://stackoverflow.com/questions/10343203/how-to-find-length-of-an-integer-in-jsp