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    <p>You can create a custom function as explained in the following tutorials:</p> <ol> <li><a href="http://anshulsood2006.blogspot.in/2012/03/creating-custom-functions-in-jsp-using.html" rel="nofollow noreferrer">Creating Custom functions in JSP using JSTL</a></li> <li><a href="http://www.noppanit.com/how-to-create-a-custom-function-for-jstl/" rel="nofollow noreferrer">How to create a custom Function for JSTL</a></li> <li><a href="http://www.javaworld.com/javaworld/jw-05-2003/jw-0523-calltag.html?page=2" rel="nofollow noreferrer">Another tutorial</a></li> </ol> <hr> <p><strong>Steps to create a function from the above links:</strong></p> <ol> <li><p>Create a <code>.tld</code> file under <code>/WEB-INF</code>:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;taglib version="2.1" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"&gt; &lt;tlib-version&gt;1.0&lt;/tlib-version&gt; &lt;short-name&gt;functionalTlds&lt;/short-name&gt; &lt;uri&gt;http://www.rasabihari.com/functionalTlds&lt;/uri&gt; &lt;function&gt; &lt;name&gt;isNumeric&lt;/name&gt; &lt;function-class&gt;com.expressions.Functions&lt;/function-class&gt; &lt;function-signature&gt;boolean isNumeric(java.lang.String)&lt;/function-signature&gt; &lt;/function&gt; &lt;/taglib&gt; </code></pre></li> <li><p>Create a class with the method (the logic of the method is taken from <a href="http://www.zparacha.com/best-way-to-check-if-a-java-string-is-a-number/#.UIVZe0b9di0" rel="nofollow noreferrer" title="Best way to check if a Java String is a Numeric">here</a>, it uses <a href="https://stackoverflow.com/tags/regex/info" title="StackOverflow Tag wiki: Regex">Regular Expression</a>)</p> <pre><code>package com.expressions; /** * * @author rasabihari */ public class Functions { public static boolean isNumeric(String number) { boolean isValid = false; /* Explaination: [-+]?: Can have an optional - or + sign at the beginning. [0-9]*: Can have any numbers of digits between 0 and 9 \\.? : the digits may have an optional decimal point. [0-9]+$: The string must have a digit at the end. If you want to consider x. as a valid number change the expression as follows. (but I treat this as an invalid number.). String expression = "[-+]?[0-9]*\\.?[0-9\\.]+$"; */ String expression = "[-+]?[0-9]*\\.?[0-9]+$"; CharSequence inputStr = number; Pattern pattern = Pattern.compile(expression); Matcher matcher = pattern.matcher(inputStr); if(matcher.matches()){ isValid = true; } return isValid; } } </code></pre></li> <li><p>And then use it in the JSP as:</p> <pre><code>&lt;%@page contentType="text/html" pageEncoding="UTF-8"%&gt; &lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %&gt; &lt;%@taglib uri="http://www.rasabihari.com/functionalTlds" prefix="ftld" %&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;title&gt;JSP Page&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;c:if test="${ftld:isNumeric('123')}"&gt; &lt;!-- ... do something ... This block will run --&gt; &lt;/c:if&gt; &lt;/body&gt; &lt;/html&gt; </code></pre></li> </ol>
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