java - 如何将异构 JSON 数组映射到 Java 对象？

Question

我通过 API 下载了大量历史加密货币市场数据。它的格式如下:

[
[1601510400000,"4.15540000","4.16450000","4.15010000","4.15030000","4483.01000000",1601510459999,"18646.50051400",50,"2943.27000000","12241.83706500","0"],
...
[1609490340000,"4.94020000","4.95970000","4.93880000","4.94950000","5307.62000000",1609490399999,"26280.03711000",98,"3751.46000000","18574.22402400","0"]
]

我认为它是一个数组数组，内部数组包含异构类型(总是相同顺序的相同类型)。作为中间步骤，我已将它保存到文本文件中，但我想读回它并将其映射到这种类型的对象数组中:

    public class MinuteCandle {
        private long openTime;
        private double openValue;
        private double highValue;
        private double lowValue;
        private double closeValue;
        private double volume;
        private long closeTime;
        private double quoteAssetVolume;
        private int numberOfTrades;
        private double takerBuyBaseAssetVolume;
        private double takerBuyQuoteAssetVolume;
        private double someGarbageData;
//...
}

我正在使用 Spring 框架和 jackson 库进行 json 映射。这样做可行还是我应该以某种方式手动解析文本？

Answer 1

使用JsonFormat并在您将形状指定为 ARRAY 的地方用它注释您的类:

@JsonFormat(shape = JsonFormat.Shape.ARRAY)
class MinuteCandle

此外，如果您想存储价格，请考虑使用 BigDecimal 而不是 double。

另见:

• A realistic example where using BigDecimal for currency is strictlybetter than using double
• How to deserialise anonymous array of mixed types with Jackson