JSTL fn: contains () function
fn: contains () function is used to determine whether a string contains a specified substring.
grammar
fn: () function contains the syntax is as follows:
<c:if test="${fn:contains(<原始字符串>, <要查找的子字符串>)}">
...
</c:if>
Examples Demo
The following examples demonstrate the capabilities of this function:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
<head>
<title>使用 JSTL 函数</title>
</head>
<body>
<c:set var="theString" value="I am from w3big"/>
<c:if test="${fn:contains(theString, 'w3big')}">
<p>找到 w3big<p>
</c:if>
<c:if test="${fn:contains(theString, 'w3big')}">
<p>找到 w3big<p>
</c:if>
</body>
</html>
Results are as follows:
找到 w3big