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Categories: JSTL

JSTL formatNumber Tag <fmt:formatNumber>

JSTL formatNumber tag is used to change the format of numbers or currency.

JSTL formatNumber Example:

To display the numbers on JSP in proper format, you can use the <fmt:formatNumber> tag like this:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

<html>
<head>
  <title>JSTL fmt:formatNumber Tag</title>
</head>
<body>
<h3>Number Format:</h3>
<c:set var="balance" value="120000.2309" />
<p>Formatted Number (1): <fmt:formatNumber value="${balance}" 
            type="currency"/></p>
<p>Formatted Number (2): <fmt:formatNumber type="number" 
            maxIntegerDigits="3" value="${balance}" /></p>
<p>Formatted Number (3): <fmt:formatNumber type="number" 
            maxFractionDigits="3" value="${balance}" /></p>
<p>Formatted Number (4): <fmt:formatNumber type="number" 
            groupingUsed="false" value="${balance}" /></p>
<p>Formatted Number (5): <fmt:formatNumber type="percent" 
            maxIntegerDigits="3" value="${balance}" /></p>
<p>Formatted Number (6): <fmt:formatNumber type="percent" 
            minFractionDigits="10" value="${balance}" /></p>
<p>Formatted Number (7): <fmt:formatNumber type="percent" 
            maxIntegerDigits="3" value="${balance}" /></p>
<p>Formatted Number (8): <fmt:formatNumber type="number" 
            pattern="###.###E0" value="${balance}" /></p>
<p>Currency in USA :
<fmt:setLocale value="en_US"/>
<fmt:formatNumber value="${balance}" type="currency"/></p>
</body>
</html>

As you can see above, in the JSTL formatNumber tag, var attribute is used to define the variable than needs to be formatted. Proper formatting needs help of other attributes from formatNumber tag.

Attributes of <fmt:formatNumber> tag are:

1. var:This attribute provides numeric value to be formatted.

2. type: This attribute specifies whether the value is to be formatted as number, currency, or percentage.

3. maxFractionDigits: This attribute provides maximum number of digits in the fractional portion of the formatted output.

4. minFractionDigits : This attribute provides Minimum number of digits in the fractional portion of the formatted output.

5. pattern: This attribute provides custom formatting pattern.

6. value: This attribute provides Numeric value to be formatted.

7. scope: This attribute provides scope of var.

8. currencyCode: This attribute provides ISO 4217 currency code. Applied only when formatting currencies (i.e. if type is equal to “currency”). Ignored otherwise.

9. currencySymbol: This attribute provides Currency symbol. Applied only when formatting currencies (i.e. if type is equal to “currency”); ignored otherwise.

10. groupingUsed: This attribute specifies whether the formatted output will contain any grouping separators..

11. maxIntegerDigits: This attribute provides Maximum number of digits in the integer portion of the formatted output.

12. minIntegerDigits: This attribute provides Minimum number of digits in the integer portion of the formatted output.

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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!