Java 货币 - 特定日期的货币兑换率

Question

我正在尝试获取特定日期欧元和美元之间的汇率。问题是我总是得到 exchange dare for date: LocalDate{year=2016, month=1, dayOfMonth=8} 并且我是否在查询中指定日期并不重要。

这是我的 Maven 依赖项：

        <dependency>
            <groupId>javax.money</groupId>
            <artifactId>money-api-bp</artifactId>
            <version>1.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.javamoney</groupId>
            <artifactId>moneta-bp</artifactId>
            <version>1.1</version>
        </dependency>

源代码：

public class Test {
    public static void main(String[] args) {
        ConversionQuery query = ConversionQueryBuilder.of()
                .setProviderName("ECB")
                .setBaseCurrency(Monetary.getCurrency("EUR"))
                .setTermCurrency(Monetary.getCurrency("USD"))
                .set(LocalDate.class, LocalDate.of(2017, Month.SEPTEMBER, 10))
                .build();
        final ExchangeRateProvider provider = getExchangeRateProvider(query);
        final ExchangeRate rate1 = provider.getExchangeRate(query);
        System.out.println(rate1);

        ExchangeRateProvider ecbExchangeRateProvider = MonetaryConversions.getExchangeRateProvider("ECB");
        ExchangeRate rate = ecbExchangeRateProvider.getExchangeRate("EUR", "USD");
        System.out.println(rate);

    }
}

以及 sout 的输出：

sep. 11, 2017 9:58:29 AM org.javamoney.moneta.internal.convert.ECBAbstractRateProvider newDataLoaded
INFO: Loaded ECBCurrentRateProvider exchange rates for days:1
sep. 11, 2017 9:58:30 AM org.javamoney.moneta.internal.convert.ECBAbstractRateProvider newDataLoaded
INFO: Loaded ECBHistoric90RateProvider exchange rates for days:63
ExchangeRate [base=EUR, factor=1.0861, conversionContext=ConversionContext (
{provider=ECB, rateTypes=[DEFERRED], providerDescription=European Central Bank, days=1, org.javamoney.moneta.internal.convert.LocalDate=LocalDate{year=2016, month=1, dayOfMonth=8}, javax.money.convert.RateType=HISTORIC})]
ExchangeRate [base=EUR, factor=1.0861, conversionContext=ConversionContext (
{provider=ECB, rateTypes=[DEFERRED], providerDescription=European Central Bank, days=1, org.javamoney.moneta.internal.convert.LocalDate=LocalDate{year=2016, month=1, dayOfMonth=8}, javax.money.convert.RateType=HISTORIC})]
ExchangeRate [base=USD, factor=0.9207255317189946, conversionContext=ConversionContext (
{provider=ECB, rateTypes=[DEFERRED], providerDescription=European Central Bank, days=1, org.javamoney.moneta.internal.convert.LocalDate=LocalDate{year=2016, month=1, dayOfMonth=8}, javax.money.convert.RateType=HISTORIC})]
sep. 11, 2017 9:58:35 AM org.javamoney.moneta.internal.convert.ECBAbstractRateProvider newDataLoaded
INFO: Loaded ECBHistoricRateProvider exchange rates for days:4358

谢谢！

Answer 1

这个 API 目前还不清楚。如果你得到：

ConversionQueryBuilder.of().setTermCurrency("EUR").
        set(LocalDate.class, LocalDate.of(2018, 1, 1)).build()
MonetaryConversions.getConversion(conversionQuery)

它将使用以下方法：

default CurrencyConversion getConversion(ConversionQuery conversionQuery) {
    return getExchangeRateProvider(conversionQuery).getCurrencyConversion(
            Objects.requireNonNull(conversionQuery.getCurrency(), "Terminating Currency is required.")
    );
}

如您所见，conversionQuery 用于获取提供程序，而非转换对象本身。它总是返回以供仅设置货币而不设置日期的查询。

要使其正常工作，请使用：

MonetaryConversions.getExchangeRateProvider().getCurrencyConversion(conversionQuery)

我相信它应该对所有调用都一致。

Java 货币 - 特定日期的货币兑换率

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