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<Fmt: formatNumber> tag

JSP Standard Tag Library JSP Standard Tag Library

<Fmt: formatNumber> tag is used to format numbers, percentages, currency.

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

<Fmt: formatNumber> tag has the following attributes:

Attributes description If necessary Defaults
value Figures to be displayed Yes no
type NUMBER, CURRENCY, or type PERCENT no Number
pattern Specify a custom formatting and output mode with no no
currencyCode Currency code (if type = "currency" time) no It depends on the default region
currencySymbol Currency symbol (if type = "currency" time) no It depends on the default region
groupingUsed Whether digital packet (TRUE or FALSE) no true
maxIntegerDigits The maximum number of integer digits no no
minIntegerDigits The minimum number of integer digits no no
maxFractionDigits The maximum number of bits after the decimal point no no
minFractionDigits The smallest decimal places no no
var Variable storage format numbers no Print to page
scope Scope var attribute no page

If the type attribute percent or number, then you can use several other formatting numeric attributes. maxIntegerDigits minIntegerDigits properties and properties allow you to specify the length of integers. If the actual number exceeds the maximum maxIntegerDigits specified, then the number will be truncated.

Some attribute allows you to specify the number of decimal places. minFractionalDigits maxFractionalDigits properties and properties allow you to specify the number of decimal places. If the actual number exceeds the specified range, this number will be truncated.

Digital packet may be used to insert a comma at every three digits. groupingIsUsed attribute is used to specify whether to use digital packet. When used with minIntegerDigits property, it must be very careful to get the desired result.

You may use the pattern attribute. This property allows you to include the specified character at the time of digital codes. The following table lists these characters.

symbol description
0 Representative digit
E Exponential format
# A representative number, if not then display 0
. Decimal point
, Digit grouping separators
; Delimited format
- Use the default negative prefix
% percentage
? Mille
Currency symbol, instead of using the actual currency symbol
X You can specify a character as a prefix or suffix
' Quote special characters in a prefix or suffix

Examples Demo 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ 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 标签</title>
</head>
<body>
<h3>数字格式化:</h3>
<c:set var="balance" value="120000.2309" />
<p>格式化数字 (1): <fmt:formatNumber value="${balance}" 
            type="currency"/></p>
<p>格式化数字 (2): <fmt:formatNumber type="number" 
            maxIntegerDigits="3" value="${balance}" /></p>
<p>格式化数字 (3): <fmt:formatNumber type="number" 
            maxFractionDigits="3" value="${balance}" /></p>
<p>格式化数字 (4): <fmt:formatNumber type="number" 
            groupingUsed="false" value="${balance}" /></p>
<p>格式化数字 (5): <fmt:formatNumber type="percent" 
            maxIntegerDigits="3" value="${balance}" /></p>
<p>格式化数字 (6): <fmt:formatNumber type="percent" 
            minFractionDigits="10" value="${balance}" /></p>
<p>格式化数字 (7): <fmt:formatNumber type="percent" 
            maxIntegerDigits="3" value="${balance}" /></p>
<p>格式化数字 (8): <fmt:formatNumber type="number" 
            pattern="###.###E0" value="${balance}" /></p>
<p>美元 :
<fmt:setLocale value="en_US"/>
<fmt:formatNumber value="${balance}" type="currency"/></p>
</body>
</html>

Results are as follows: 

数字格式化:

格式化数字 (1): ￥120,000.23

格式化数字 (2): 000.231

格式化数字 (3): 120,000.231

格式化数字 (4): 120000.231

格式化数字 (5): 023%

格式化数字 (6): 12,000,023.0900000000%

格式化数字 (7): 023%

格式化数字 (8): 120E3

美元 : $120,000.23

JSP Standard Tag Library JSP Standard Tag Library