[英]Java Money - currency conversion rate on specific date
我试图在欧元和美元之间的特定日期获得汇率。 问题是我总是得到交换敢于约会: LocalDate{year=2016, month=1, dayOfMonth=8}
如果我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);
}
}
和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!
这个API目前很模糊。 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, 而不是转换对象本身。 它始终返回查询时只设置货币,从不与日期一起返回。
为了使其工作使用:
MonetaryConversions.getExchangeRateProvider().getCurrencyConversion(conversionQuery)
我相信它应该对所有调用都一致。
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