在Jackson中将给定的int序列编写为十六进制值数组 [英] Writing a given sequence of int's as an array of hex values in Jackson

问题描述

是否可以使Jackson FasterXML库将给定的Integer值序列序列化为Hex值数组?简而言之，我想要代码:

Is it possible to make Jackson FasterXML library to serialize a given sequence of Integer values as an array of Hex values? That is, simply put, I would like that the code:

public class SampleJson {
    private final ObjectMapper mapper = new ObjectMapper();

    JsonNode toJson(int[] values) {
        ArrayNode jsonArray = mapper.createArrayNode();
        for(int i: values)
            jsonArray.add(i);
        return jsonArray;
    }

    String toJsonString(JsonNode node) throws JsonProcessingException {
        return mapper.writeValueAsString(node);
    }

    public static void main(String[] args) {
        SampleJson sj = new SampleJson();
        int[] values = {1, 2, 0x10, 0x20};
        try {
            System.out.println(sj.toJsonString(sj.toJson(values)));
        } catch (JsonProcessingException e) {
            System.err.println("Something goes wrong...");
        }
    }
}

会产生[0x1,0x2,0x10,0x10]，而不是现在的[1,2,16,32].

would produce [0x1,0x2,0x10,0x10], not [1,2,16,32] as it does now.

推荐答案

要回答此问题，我们需要看一下 JSON规范及其对数字的说明:

To answer this question we need to take a look at JSON specification and what it says about numbers:

数字非常类似于C或Java数字，除了八进制 和十六进制格式.

因此，要以十六进制格式写数字，您需要实现自定义序列化程序并将其写为string原语:

So, to write numbers in hexadecimal format you need to implement custom serialiser and write them as string primitives:

["0x1","0x2","0x10","0x10"]

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