java-MoneyFormatter :: parseMoney引发MoneyFormatException

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采取以下SSCCE(已安装Joda-Money库)：

public static void main(String[] args) {
    BigDecimal bd = new BigDecimal("100");
    MoneyFormatter mf = new MoneyFormatterBuilder().appendLiteral("$").appendAmount(MoneyAmountStyle.LOCALIZED_GROUPING).toFormatter();
    String money_as_string = mf.print(Money.of(CurrencyUnit.USD, bd)); // The MoneyFormatter is what printed this string...
    System.out.println(money_as_string);
    Money money = mf.parseMoney(money_as_string); // You think it should be able to parse the string it gave me, right?
}

我使用了MoneyFormatter来打印字符串：money_as_string.我的(合理的？)期望是,我可以使用相同的MoneyFormatter将字符串解析回Money对象.但是,a,没有骰子.它引发此错误：

Exception in thread "main" org.joda.money.format.MoneyFormatException: Parsing did not find both currency and amount: $100.00
    at org.joda.money.format.MoneyFormatter.parseBigMoney(MoneyFormatter.java:237)
    at org.joda.money.format.MoneyFormatter.parseMoney(MoneyFormatter.java:258)
    at test4.Test12.main(Test12.java:35)

因此,我的问题是：如何从字符串中准确地获取Money对象？

编辑：@ durron597,您的信息很有帮助,但未回答问题.那么,您究竟如何从字符串变成Money对象？

我添加了删除美元符号的代码：

public static void main(String[] args) {
    BigDecimal bd = new BigDecimal("100");
    MoneyFormatter mf = new MoneyFormatterBuilder().appendLiteral("$").appendAmount(MoneyAmountStyle.LOCALIZED_GROUPING).toFormatter();
    String money_as_string = mf.print(Money.of(CurrencyUnit.USD, bd)); // The MoneyFormatter is what printed this string...
    System.out.println(money_as_string);
    Money money = mf.parseMoney(money_as_string.replace("$", "").trim()); // You think it should be able to parse the string it gave me, right?
}

我得到了这个：

Exception in thread "main" org.joda.money.format.MoneyFormatException: Text could not be parsed at index 0: 100.00
    at org.joda.money.format.MoneyFormatter.parseBigMoney(MoneyFormatter.java:233)
    at org.joda.money.format.MoneyFormatter.parseMoney(MoneyFormatter.java:258)
    at test4.Test12.main(Test12.java:35)

因此,它无法解析带有或不带有货币符号的文本.

任何人都可以让parseMoney()函数正常工作吗？

解决方法:

因此,对我来说突出的第一件事是,您使用的是appendLiteral而不是appendCurrencySymbolLocalized(如果使用的是CurrencyUnit.EUR,那会是$.)

但是,当您将其更改为此：

MoneyFormatter mf = new MoneyFormatterBuilder()
        .appendCurrencySymbolLocalized()
        .appendAmount(MoneyAmountStyle.LOCALIZED_GROUPING)
        .toFormatter();

您的代码将引发以下异常：

Exception in thread "main" java.lang.UnsupportedOperationException: MoneyFomatter has not been configured to be able to parse
    at org.joda.money.format.MoneyFormatter.parse(MoneyFormatter.java:281)
    at org.joda.money.format.MoneyFormatter.parseBigMoney(MoneyFormatter.java:229)
    at org.joda.money.format.MoneyFormatter.parseMoney(MoneyFormatter.java:258)
    at MoneyTest.main(MoneyTest.java:17)

进一步检查发现这条告诉线in the javadoc：

appendCurrencySymbolLocalized

public0700107002

Appends the localized currency symbol to the builder.
The localized currency symbol is the symbol as chosen by the locale of the formatter.

Symbols cannot be parsed.

Returns: this, for chaining, never null

为什么会这样呢？可能是因为货币符号不明确. Many countries use a dollar.以下是一些examples：

In addition to those countries of the world that use dollars or pesos, a number of other countries use the $symbol to denote their currencies, including:

• Nicaraguan córdoba (usually written as C$)
• Samoan tālā (a transliteration of the word dollar)
• Tongan pa?anga
• Zimbabwe (usually written as Z$)

试试这个代码：

MoneyFormatter mf = new MoneyFormatterBuilder()
        .appendCurrencyCode()
        .appendAmount(MoneyAmountStyle.LOCALIZED_GROUPING)
        .toFormatter();

这样可以打印出100.00美元之类的东西,并且可以正确解析.如果您绝对必须带有美元符号,则需要实现自己的打印机/解析器.或者,您可以使用此代码：

import java.io.IOException;
import java.math.BigDecimal;

import org.joda.money.BigMoney;
import org.joda.money.CurrencyUnit;
import org.joda.money.IllegalCurrencyException;
import org.joda.money.Money;
import org.joda.money.format.MoneyAmountStyle;
import org.joda.money.format.MoneyFormatter;
import org.joda.money.format.MoneyFormatterBuilder;
import org.joda.money.format.MoneyParseContext;
import org.joda.money.format.MoneyParser;
import org.joda.money.format.MoneyPrintContext;
import org.joda.money.format.MoneyPrinter;

public class MoneyTest {
    private static enum DollarParserPrinter implements MoneyParser,
            MoneyPrinter {
        INSTANCE;

        private static final String DOLLAR_SYMBOL = "$";

        @Override
        public void parse(MoneyParseContext context) {
            int endPos = context.getIndex() + 2;
            if (endPos > context.getTextLength()) {
                context.setError();
            } else {
                String code =
                        context.getTextSubstring(context.getIndex(), endPos);
                if(DOLLAR_SYMBOL.equals(code)) {
                    context.setCurrency(CurrencyUnit.USD);
                    context.setIndex(endPos);
                }
            }
        }

        @Override
        public void print(MoneyPrintContext context, Appendable appendable,
                BigMoney money) throws IOException {
            if(CurrencyUnit.USD == money.getCurrencyUnit()) {
                appendable.append(DOLLAR_SYMBOL);
            } else {
                throw new IllegalCurrencyException("This parser only knows how to print US Dollar money!");
            }
        }
    }

    public static void main(String[] args) {
        BigDecimal bd = new BigDecimal("100");
        MoneyFormatter mf =
                new MoneyFormatterBuilder().append(DollarParserPrinter.INSTANCE, DollarParserPrinter.INSTANCE)
                        .appendAmount(MoneyAmountStyle.LOCALIZED_GROUPING)
                        .toFormatter();
        String money_as_string = mf.print(Money.of(CurrencyUnit.USD, bd)); 
        System.out.println(money_as_string);
        Money money = mf.parseMoney(money_as_string);
        System.out.println(money);
    }
}

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