fn:length() Function

JSP 标准标签库JSP Standard Tag Library

The fn:length() function returns the length of a string or the number of elements in a collection.

Syntax

The syntax of the fn:length() function is as follows:

${fn:length(collection | string)}

Example Demonstration

The following example demonstrates the functionality 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>

The output is as follows:

字符串长度 (1) : 21

字符串长度 (2) : 22

JSP 标准标签库JSP Standard Tag Library

Other Extensions