在Java中转换美元（整数）的美元（大十进制）的最佳方法是什么？ [英] What is the best way to convert Dollars (Big Decimal) in Cents (Integer) in java?

问题描述

我必须将我的Web应用程序与支付网关集成。我想以美元输入总金额，然后将其转换为美分，因为我的支付网关库接受的数量为Cents（类型为 Integer ）。我发现java中的 Big Decimal 是操纵货币的最佳方式。目前我接受输入为50美元，并将其转换为整数，如下所示：

I have to integrate my web application with a payment gateway. I want to input total amount in USD and then convert it into Cents as my payment gateway library accepts amount in Cents (of type Integer). I found that Big Decimal in java is best way for manipulation of currency. Currently I take input as say USD 50 and convert it to Integer like this:

BigDecimal rounded = amount.setScale(2, BigDecimal.ROUND_CEILING);
BigDecimal bigDecimalInCents = rounded.multiply(new BigDecimal("100.00"));
Integer amountInCents = bigDecimalInCents.intValue();

这是将USD转换为Cents的正确方法还是应该以其他方式进行？

Is this the correct way of converting USD to Cents or I should do it in some other way?

推荐答案

下面包括我的观点的最简单的是：

The simplest which includes my points below is:

public static int usdToCents(BigDecimal usd) {
    return usd.movePointRight(2).intValueExact();
}

我建议 intValueExact 因为如果信息丢失（如果您处理超过21,474,836.47美元的交易），这将抛出异常。这也可以用来捕获丢失的分数。

I'd recommend intValueExact as this will throw an exception if information will be lost (in case you're processing transactions above $21,474,836.47). This can also be used to trap lost fractions.

我还要考虑接受一个分数和分数的值是否正确。我会说不，客户端代码必须提供有效的可结算金额，所以如果我需要一个自定义异常，我可以这样做：

I'd also consider whether is it correct to accept a value with a fraction of a cent and round. I'd say no, the client code must supply a valid billable amount, so I might do this if I needed a custom exception for that:

public static int usdToCents(BigDecimal usd) {
    if (usd.scale() > 2) //more than 2dp
       thrown new InvalidUsdException(usd);// because was not supplied a billable USD amount
    BigDecimal bigDecimalInCents = usd.movePointRight(2);
    int cents = bigDecimalInCents.intValueExact();
    return cents;
}

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