以印度编号格式显示货币 [英] Displaying Currency in Indian Numbering Format

问题描述

我有一个关于格式化卢比货币(印度卢比 - INR)的问题.

I have a question about formatting the Rupee currency (Indian Rupee - INR).

通常像 450500 这样的值被格式化并显示为 450,500.在印度，相同的值显示为 4,50,500

Typically a value like 450500 is formatted and shown as 450,500. In India, the same value is displayed as 4,50,500

例如，这里的数字表示为:

For example, numbers here are represented as:

1
10
100
1,000
10,000
1,00,000
10,00,000
1,00,00,000
10,00,00,000

参考印度编号系统

分隔符在两位数字之后，最后一组除外，以千为单位.

The separators are after two digits, except for the last set, which is in thousands.

我在互联网上搜索过，人们要求使用区域设置 en_GB 或模式 #,##,##,##,##0.00

I've searched on the internet and people have asked to use the locale en_GB or pattern #,##,##,##,##0.00

我使用以下标签在 JSTL 上尝试了这个:

I tried this on JSTL by using the following tag:

<fmt:formatNumber value="${product.price}" type="currency" 
  pattern="#,##,##,##,###.00"/>

但这似乎并没有解决问题.

But this does not seem to solve the issue.

推荐答案

遗憾的是标准 Java SE DecimalFormat 不支持可变宽度组.所以它永远不会像你想要的那样完全格式化值:

Unfortunately on standard Java SE DecimalFormat doesn't support variable-width groups. So it won't ever format the values exactly as you want to:

如果您提供具有多个分组字符的模式，则最后一个和整数末尾之间的间隔是使用的那个.所以 "#,##,###,####"== "######,####"== "##,####,####".

If you supply a pattern with multiple grouping characters, the interval between the last one and the end of the integer is the one that is used. So "#,##,###,####" == "######,####" == "##,####,####".

Java 中的大多数数字格式化机制都基于该类，因此继承了这个缺陷.

Most number formatting mechanisms in Java are based on that class and therefore inherit this flaw.

ICU4J(Unicode 国际组件的 Java 版本)提供了一个 NumberFormat 执行的类 支持这种格式:

ICU4J (the Java version of the International Components for Unicode) provides a NumberFormat class that does support this formatting:

Format format = com.ibm.icu.text.NumberFormat.getCurrencyInstance(new Locale("en", "in"));
System.out.println(format.format(new BigDecimal("100000000")));

此代码将产生以下输出:

This code will produce this output:

Rs 10,00,00,000.00

注意:com.ibm.icu.text.NumberFormat 类不扩展java.text.NumberFormat 类(因为它已经扩展了 ICU 内部基类)，它确实但是扩展了java.text.Format 类，它具有 format(Object) 方法.

Note: the com.ibm.icu.text.NumberFormat class does not extend the java.text.NumberFormat class (because it already extends an ICU-internal base class), it does however extend the java.text.Format class, which has the format(Object) method.

请注意，java 的 Android 版本.text.DecimalFormat 类是在幕后使用 ICU 实现的，并且确实以与 ICU 类本身相同的方式支持该功能(即使摘要错误地提到它是不支持).

Note that the Android version of java.text.DecimalFormat class is implemented using ICU under the hood and does support the feature in the same way that the ICU class itself does (even though the summary incorrectly mentions that it's not supported).

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