Dinesh on Java

Categories: JSTL

JSTL fn:contains() Function

JSTL Contains function is used to check whether target string contains specified string or not. contains function is used for checking whether the specified substring is contained by the string or not.

Syntax :

boolean contains(String, String)

JSTL Contains Function Example:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSTL Contains Function Example</title>
</head>
<body>
  <c:out value="${fn:contains('Hello', 'el')}"></c:out>
</body>
</html>

Output: true

As you can see above, fn:contains() takes ‘Hello’ string as an input parameter and check if it contains ‘el’ and will return true as a result.

JSTL Contains Function Example:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
<head>
<title>Using JSTL Functions</title>
</head>
<body>

<c:set var="theString" value="I am a good programmer"/>

<c:if test="${fn:contains(theString, 'good')}">
   <p>Found good string<p>
</c:if>

<c:if test="${fn:contains(theString, 'GOOD')}">
   <p>Found GOOD string<p>
</c:if>

</body>
</html>

Output: Found good string

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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!