JSTL Format Tag fmt:formatNumber Example

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Last Updated on 31 August 2019   |   Print  Email


This post helps you understand how to use the <fmt:formatNumber> tag in the JSTL format tags library.

The <fmt:formatNumber> is used to format number values as number, currency or percentages.

 

JSTL <fmt:formatNumber> Syntax:

<fmt:formatNumber

  value="<string>"

  type="<string>"

  pattern="<string>"

  currencyCode="<string>"

  currencySymbol="<string>"

  groupingUsed="<string>"

  maxIntegerDigits="<string>"

  minIntegerDigits="<string>"

  maxFractionDigits="<string>"

  minFractionDigits="<string>"

  var="<string>"

  scope="<string>"/>

 

Attributes:

Name

Required

Type

Description

    

value

False

java.lang.String

Numeric value to be formatted.

type

False

java.lang.String

Determines whether the value is formatted as a number, currency or percentage.

pattern

False

java.lang.String

Formatting pattern.

currencyCode

False

java.lang.String

The currency code to be used if the type attribute is currency.

currencySymbol

False

java.lang.String

The currency symbol to be used if the typeattribute is currency.

groupingUsed

False

java.lang.String

Whether any grouping separated to be used when formatting the output.

maxIntegerDigits

False

java.lang.String

Maximum number of digits in the integer portion.

minIntegerDigits

False

java.lang.String

Minimum number of digits in the integer portion.

maxFractionDigits

False

java.lang.String

Maximum number of digits in the fraction portion.

minFractionDigits

False

java.lang.String

Minimum number of digits in the fraction portion.

var

False

java.lang.String

Name of the variable which stores the formatted result.

scope

False

java.lang.String

Scope to store the var.

 

JSTL <fmt:formatNumber> Example:

The below JSP code takes account balances and displays it using various formats.

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!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>&lt;fmt:formatNumber&gt; Demo</title>
    </head>
    <body>
      <h1>&lt;fmt:formatNumber&gt; Demo</h1>
      The Account Balance can be displayed using various ways:
      <c:set var="accountBalance" value="9500.60" />
      <p>as it is: <strong><fmt:formatNumber value="${accountBalance}" type="currency"/></strong></p>
      <p>max. integer digits 3: 
      <strong>
          <fmt:formatNumber type="number" maxIntegerDigits="3" value="${accountBalance}" />
      </strong></p>
      <p>max. fraction digits 1: 
      <strong>
          <fmt:formatNumber type="number" maxFractionDigits="3" value="${accountBalance}" />
      </strong></p>
      <p>no grouping: 
      <strong>
          <fmt:formatNumber type="number" groupingUsed="false" value="${accountBalance}" />
      </strong></p>
      <p>percent with max. integer digits 3: 
      <strong>
          <fmt:formatNumber type="percent" maxIntegerDigits="3" value="${accountBalance}" />
      </strong></p>
      <p>percent with min. fraction digits 10: 
      <strong>
          <fmt:formatNumber type="percent" minFractionDigits="10" value="${accountBalance}" />
      </strong></p>
      <p>pattern ###.###E0: 
      <strong>
          <fmt:formatNumber type="number" pattern="###.###E0" value="${accountBalance}" />
      </strong></p>
      <p>Account Balance in USA :
      <fmt:setLocale value="en_US"/>
      <strong><fmt:formatNumber value="${accountBalance}" type="currency"/></p></strong>
       <p>Account Balance in Canada :
       <fmt:setLocale value="fr_CA"/>
       <strong><fmt:formatNumber value="${accountBalance}" type="currency"/></p></strong>
   </body>
</html>

 

Output:

formatnumber

 

Recommended Usage of JSTL <fmt:formatNumber> tag:

Mostly used to format numbers, currency and percentage values. Attributes are provided to control the number of digits to be displayed in the decimal and fractional parts. We can enable or disable grouping which is used to display commas (,) to separate thousand groups. We can specify various patterns to display the values. The following table summarizes the representations to be used in the pattern.

Symbol

Description

0

Represents digits.

E

Represents exponential.

#

Represents a single digit.

.

Place holder for the decimal separator.

,

Place holder for grouping separator.

;

Separates formats.

-

Default negative prefix.

%

Multiplies by 100 and displays as percentage.

?

Multiples by 1000 and displays as milli.

X

Indicates that any other character can be used in the prefix or suffix

' (Unicode (\u2030)

Used to quote special characters in the prefix or suffix.

ยค (Unicode \u00A4)

Represents currency symbol. Replaced by currency symbol.

 

Other JSTL Format Tags:

bundle  |  formatDate  |  message  |  param  |  parseDate  |  parseNumber  |  requestEncoding  |  setBundle  |  setLocale  |  setTimeZone  |  timeZone


About the Author:

is certified Java programmer (SCJP and SCWCD). He began programming with Java back in the days of Java 1.4 and has been passionate about it ever since. You can connect with him on Facebook and watch his Java videos on YouTube.



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Comments 

#1Nguyen Quoc Tuan2018-11-12 03:24
thanks a lot bro :v :v :v
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