Parse currency with symbol: Not all case working - Java

问题

I am using java.text.NumberFormat to parse String currency which has currency symbol. It is working for some cases while fails for other.

NumberFormat.getCurrencyInstance(Locale.FRANCE).parse("1 599,99 €"); //fails
NumberFormat.getCurrencyInstance(Locale.FRANCE).parse("599,99 €"); //works fine

Can somebody please explain why it is not working in first case? Is Joda-Money a better library for such type of parsing?

回答1:

The reason that this might not work for you, is usage of invalid white space character.

The format class expect the char with code 160 witch is describe as "Non-breaking space", when you may pass the code 30 witch is "Space".

You can run this code to check it.

NumberFormat currencyInstance = NumberFormat.getCurrencyInstance(Locale.FRANCE);

String france = "1 599,99 €";
String format = currencyInstance.format(1599.99);
Number number = currencyInstance.parse(format);


System.out.println("France: " + format);
System.out.println("Format: " + format);
System.out.println("Number: " + number);

if(france.equals(format)) {
    number = currencyInstance.parse(france); // Must work;
    System.out.println(number);
} else {

    char[] fr = france.toCharArray();
    char[] ft = format.toCharArray();

    for(int i = 0; i < fr.length; i++) {
        if(fr[i] != ft[i]) {
            System.out.printf("The value on position %d are not equal. France: %d; Format: %d", i,(int)fr[i], (int)ft[i]);
        }
    }

}

Then environment details:

 java version "1.7.0_17"
 Java(TM) SE Runtime Environment (build 1.7.0_17-b02)
 Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)
 OS: Windows 7 64-bits.

ASCII table

NOTE:

As @Black Panter added this is known bug

JDK-4510618 : [Fmt-Nu] French thousands separator is non-breaking space

WORK AROUND

(1) Remove user's grouping separator (i.e. U+0020) in a String to be parsed.

(2) Replace user's grouping separator with the formatter's grouping seperator (U+00A0) if it's inconvenient to remove all spaces.

回答2:

it is because of the space in your number 1 599, it will throw a ParseException Remove the space and it will work like a charm

But it is not supposed to throw an exception, as the document states

Returns a Long if possible (e.g., within the range [Long.MIN_VALUE, Long.MAX_VALUE] and with no decimals), otherwise a Double. If IntegerOnly is set, will stop at a decimal point (or equivalent; e.g., for rational numbers "1 2/3", will stop after the 1). Does not throw an exception; if no object can be parsed, index is unchanged!

I just found this Link states about a bug relating to this.

来源：https://stackoverflow.com/questions/19488923/parse-currency-with-symbol-not-all-case-working-java

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java

currency