jsp implementation method to determine whether list contains string

In jstl, there is a method like fn:contains(str,str) to determine whether a string contains another string, but there is no method to determine whether a list contains a string, so I wrote a method myself

contains.tag:

<%@ tag import="java.util.List" %>
<%@ tag import="org.apache.commons.lang3.StringUtils" %>
<%@ tag import="java.util.Arrays" %>
<%@tag pageEncoding="UTF-8"%>
<%@ attribute name="srcStr" type="java.lang.String" required="true"%>
<%@ attribute name="separatorChars" type="java.lang.String" required="false"%>
<%@ attribute name="str" type="java.lang.String" required="true"%>
<%
  String sepChars=separatorChars==null?"-":separatorChars;
  String[] splitChars = StringUtils.split(srcStr, sepChars);
  List<String> list = Arrays.asList(splitChars);
  if(list.contains(str))
  {%>
    <jsp:doBody/>
<%}
%>

Then add a sentence on the page of the method you need to use:

<%@ taglib prefix="gms" tagdir="/WEB-INF/tags" %>

This way you can use it directly

<gms:contains srcStr="${srcStr }" str="${str }"> str </gms:contains>

This way you can Judged.

The above is the entire implementation method of JSP to judge whether the list contains string brought by the editor. I hope everyone will support the PHP Chinese website~

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