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JSTL Size Of Map

By admin | April 06, 2014 | Updated : May 10, 2020 jsp, jstl, No Comments
JSTL Size Of Map

JSTL Size Of Map explains about how to find the size of a map using JSTL Taglib

Consider the example here, a JSP page which contains a HashMap with lot of key value pairs in it and we need to find the size of this HashMap

We already seen how to find the size of a Collection using the JSTL fn:length function.

You can see it fn:length() JSTL Function .

Note

For iterating a Map, you can follow below tutorial

You can change JSTL forEach Map Iteration

Required Libraries

You need to download

  1. Tomcat 9
  2. JSTL 1.2

Following jar must be in classpath

  1. jstl-1.2.jar

Find JSTL Size Of Map 

// How to find size of a map using JSTL
    

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ page import="java.util.HashMap"%>
<%
    HashMap<String,String> numMap = new HashMap<String,String>();
    numMap.put("1","one");
    numMap.put("2","two");
    numMap.put("3","three");
    request.setAttribute("numMap", numMap);
%>
<html>
<body>
    Size is ${numMap.size()}
</body>
</html>
Output
Size is 3

Please check the table, You can iterate following table items using c:forEach tag

JSTL foreach Collections





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