JSTL fn: length () function
fn: length () function returns the string length or the number of elements in the collection.
grammar
fn: () syntax length function is as follows:
${fn:length(collection | string)}
Examples Demo
The following examples demonstrate the capabilities of this function:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %> <html> <head> <title>使用 JSTL 函数</title> </head> <body> <c:set var="string1" value="This is first String."/> <c:set var="string2" value="This is second String." /> <p>字符串长度 (1) : ${fn:length(string1)}</p> <p>字符串长度 (2) : ${fn:length(string2)}</p> </body> </html>
Results are as follows:
字符串长度 (1) : 21 字符串长度 (2) : 22