首先在WEB配置頁面中添加tld文件
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其次，然后再WEB.XML文件中配置說明
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<!-- 添加自定義JSP標簽 -->
<jsp-config>
<!-- 在JSP頁面中同樣也需要引用標簽，這里只是獲取的uri定義結果不一樣 -->
<taglib>
<taglib-uri>/hb</taglib-uri>
<taglib-location>/WEB-INF/taglibs/c.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/fmt</taglib-uri>
<taglib-location>/WEB-INF/taglibs/fmt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/functions</taglib-uri>
<taglib-location>/WEB-INF/taglibs/fn.tld</taglib-location>
</taglib>
</jsp-config>
最后，頁面展示?
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="/hb"%>
<%@ taglib prefix="fmt" uri="/fmt"%>
<%@ taglib prefix="fn" uri="/functions"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'fn.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
使用fn功能是對集合長度的取值<p></p>
<%
ArrayList arrayList1 = new ArrayList();
arrayList1.add("aa");
arrayList1.add("bb");
arrayList1.add("cc");
request.getSession().setAttribute("arrayList1",arrayList1);
%>
${fn:length(sessionScope.arrayList1) }
<hr/>
fn:contains函數用來判斷源字符串是否包含子字符串<br/>
${fn:contains("ABC","a") }<br/>
${fn:contains("ABC","A") }
<hr/>
fn:containsIgnoreCase跟fn:contains函數差不多，唯一的區別是不區分大小寫
<br/>
${fn:containsIgnoreCase("ABC","a") }<br/>
${fn:containsIgnoreCase("ABC","A") }
<hr/>
fn:startsWith函數用來判斷源字符串是否符合一連串的特定詞頭(區分大小寫)<br/>
${fn:startsWith("ABC","ab") }<br/>
${fn:startsWith("ABC","AB") }
<hr/>
fn:endsWith函數用來判斷源字符串是否符合一連串特定詞尾（區分大小寫）<br>
${fn:endsWith("ABC","bc") }<br/>
${fn:endsWith("ABC","BC") }
<hr/>
fn:indexOf函數用于取得子字符串與源字符串匹配的開始位置，如果沒有匹配的將返回-1<br/>
${fn:indexOf("ABCD","BC") }<br/>
${fn:indexOf("ABCD","aBC") }
<hr/>
fn:join函數允許為一個字符串數組中的每個字符串加上分隔符連接起來<br>
<%
String[] stringArray={"huang","biao","dage"};
request.setAttribute("stringArray",stringArray);
%>
${stringArray }<br/>
${fn:join(stringArray,"-") }
<hr/>
fn:replace函數允許為源字符串做替換工作<br/>
${fn:replace("ABC","A","#") }
<hr/>
fn:split函數用于將一組由分隔符分隔的字符串轉換為字符串數組<br/>
${fn:split("a,b,c",",") }
<hr/>
fn:trim函數將刪除源字符串中結尾部分的“空格”以產生新的字符串<br/>
${fn:trim("abc ") }d<br>
<hr/>
fn:toUpperCase函數允許將源字符串中的字符全部轉換為大寫字母<br>
${fn:toUpperCase("abcd") }
<hr/>
fn:toLowerCase函數允許將源字符串中的字符全部轉換成小寫字母<br/>
${fn:toLowerCase("ABCD") }
<HR/>
fn:substringBefore函數允許截取源字符串從開始到某個字符串<br/>
${fn:substringBefore("ABCD","BC") }
<hr/>
fn:substringAfter函數允許截取源字符串結尾的后一個字符<br/>
${fn:substringAfter("ABCD","BC") }
<hr/>
fn:substring函數用于截取字符串<br/>
${fn:substring("ABC",1,2) }
<hr/>
</body>
</html>
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備注：上面的配置信息不是必須的，只是為了學習使用