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JSTL In Java

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JSTL abbreviated as Java Standard Tag Library, which is a further extension for JSP (Java Server Pages). JSTL reduced the lines of code for the developer. This JSTL supports for structural tasks, a common task like conditional and iteration. These tags used for changing I18N (Internationalization) tags, SQL tags, XML documents, etc. This also provides a framework for attaching the already existing custom tags within the Java Standard Tag Library.

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Advantages of JSTL:

  • Fast Development.
  • Code Reusability.
  • No need to use a scriptlet tag.

How does JSTL Work in Java?

JSTL works based on the type of tag we have used in our application. It consists of around 5 types of tags. They are

  1. Core tags
  2. Function tags
  3. Formatting tags
  4. XML tags
  5. SQL tags

JSTL tags Description:

Tag Type Description URI to include prefix
Core tags The JSTL core tag provides flow control, variable support, URL management etc. http://java.sun.com/jsp/jstl/core c
Function tags This function tag is used for String manipulation and
String length		 http://java.sun.com/jsp/jstl/
functions		 fn
Formatting tags This formatting tag is used for number, date and message formatting http://java.sun.com/jsp/jstl/fmt fmt
XML tags This XML tag is used for transformation and flow control etc. http://java.sun.com/jsp/jstl/xml x
SQL tags This SQL tag is used to provide support for SQL support.  http://java.sun.com/jsp/jstl/sql sql
Tag Type		 Description URI to include prefix
Core tags The JSTL core tag provides flow control, variable support, URL management etc. http://java.sun.com/jsp/jstl/core c
Function tags This function tag is used for String manipulation and
String length		 http://java.sun.com/jsp/jstl/
functions		 fn
Formatting tags This formatting tag is used for number, date and message formatting http://java.sun.com/jsp/jstl/fmt fmt
XML tags This XML tag is used for transformation and flow control etc. http://java.sun.com/jsp/jstl/xml x
SQL tags This SQL tag is used to provide support for SQL support.  http://java.sun.com/jsp/jstl/sql sql

Each JSTL tag have again consisting of different sub tags. Now time being, we will some of the examples of core tags and function tags.

Note: Make use of these functionalities; we must use the jstl.1.X.jar file. X indicates the version.

Examples

Following are the examples are given below:

Project Structure in eclipse:

JSTL In Java

Example #1 – Core tag c:out

Code: NewFile.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<title>JSTL Tags</title>
</head>
<body>
<!--THis c:out tag is used for displaying output-->
<c:out value="${'Hello Amardeep, Wel come to EDUCBA online courses.'}" />
</body>
</html>

Output:

JSTL In Java

Example #2 – Core tag set and c:if tags

Code: SetCIf.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>JSTL Tags</title>
</head>
<body>
<c:set var="money" scope="session" value="${5000*5}"/>
<c:if test="${money > 8000}">
<p>My Salary is: <c:out value="${money}"/><p>
</c:if>
</body>
</html>

Output:

JSTL In Java

Example #3 – Core tag with c:choose tag

Code: CChoose.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>JSTL Tags</title>
</head>
<body>
<c:set var="money" scope="session" value="${5000*5}"/>
<p>Your income is : <c:out value="${money}"/></p>
<c:choose>
<c:when test="${money <= 1000}">
You are paid with good salary.
</c:when>
<c:when test="${money > 10000}">
You are paid with really good salary.
</c:when>
<c:otherwise>
You are paid with low salary .
</c:otherwise>
</c:choose>
</body>
</html>

Output:

JSTL In Java

Example #4 – Core tag with c:when tag

Code: CWhen.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<title>JSTL Tags</title>
</head>
<body>
<c:set value="214" var="digit"></c:set>
<c:choose>
<c:when test="${digit%2==0}">
<c:out value="${digit} is EVEN digit"></c:out>
</c:when>
<c:otherwise>
<c:out value="${digit} is ODD digit"></c:out>
</c:otherwise>
</c:choose>
</body>
</html>

Output:

JSTL In Java

Example #5 – Core tag with c:foreach tag

Code: CForeach.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<title>JSTL Tags</title>
</head>
<body>
<c:forEach var="iterator" begin="100" end="110">
Count: <c:out value="${iterator}" />
<p>
</c:forEach>
</body>
</html>

Output:

JSTL In Java

Example #6 – Core tag with c:forTokens tag

Code: CForTokens.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<title>JSTL Tags</title>
</head>
<body>
<c:forTokens items="My-Name-is-Nathi-Paramesh" delims="-" var="del">
Word: <c:out value="${del}" />
<p>
</c:forTokens>
</body>
</html>

Output:

 JSTL In Java

Example # 7 – Core tag with c:redirect tag

Code: CRedirect.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<title>JSTL Tags</title>
</head>
<body>
<c:set var="urlName" value="2" scope="request"/>
<c:if test="${urlName<1}">
<c:redirect url="http:/educba.com"/>
</c:if>
<!-- Page directly redirect to gmail because value is greater than 1 -->
<c:if test="${urlName>1}">
<c:redirect url="http://gmail.com"/>
</c:if>
</body>
</html>

Output:

 JSTL In Java

Example #8 – Function tag with c:contains tag

Code: FunctionContains.jsp

<%@ 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>JSTL Tags</title>
</head>
<body>
<c:set var="StringType"
value="We are learning online course from EDUCBA platform" />
<c:if test="${fn:contains(StringType, 'EDUCBA')}">
<h1 style="color: green">Yes Given String found in the value
</h1>
<p style="color:blue;border: 1px solid red;font-size:20px">JSTL abbreviated as Java Standard Tag Library. Which is
further extension for JSP (Java Server Pages). JSTL reduced the lines
of code for developer. This JSTL supports for structural tasks,
common task like conditional and iteration. This tags used for
changing I18N (Internationalization) tags, SQL tags, XML documents
etc. This JSTL also provides a framework for attaching the already
existing custom tags within the Java Standard Tag Library.</p>
</c:if>
<c:if test="${fn:contains(StringType, 'courses')}">
<p>No Given String is not found in the value
<p>
</c:if>
</body>
</html>

Output:

 JSTL In Java

Example # 9 – Function tag with c:endsWith tag

Code: CEndsWith.jsp

<%@ 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>JSTL Tags</title>
</head>
<body>
<c:set var="StringType"
value="We are learning online course from EDUCBA platform" />
<c:if test="${fn:endsWith(StringType, 'platform')}">
<h1 style="color: red">Yes String ends with platfrom.</h1>
<p style="color: fuchsia; border: 1px solid red; font-size: 20px">JSTL
abbreviated as Java Standard Tag Library. Which is further extension
for JSP (Java Server Pages). JSTL reduced the lines of code for
developer. This JSTL supports for structural tasks, common task like
conditional and iteration. This tags used for changing I18N
(Internationalization) tags, SQL tags, XML documents etc. This JSTL
also provides a framework for attaching the already existing custom
tags within the Java Standard Tag Library.</p>
</c:if>
<c:if test="${fn:endsWith(String, 'are')}">
<p>String ends with are.
<p>
</c:if>
</body>
</html>

Output:

JSTL In Java

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