jstl determines whether a string contains another string

<%@ 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" %>

<c:set var="StrMain" value="I hava string"/>//后台传也可以。只需将value的值使用 ${}替换即可

<c:if test="${fn:contains(StrMain,'string')}">
   contains//需要实现的内容
</c:if>