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What is the best way to serialize ZoneId or ZoneOffset from format +03:00 to format +03.00 using Jackson? Or may be there is another way how to change : to .

Ole V.V.
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trom
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  • The format with the colon is the [ISO 8601 standard](https://en.wikipedia.org/wiki/ISO_8601). You can’t persuade the consumer of your JSON to accept that? – Ole V.V. Jan 28 '23 at 12:49
  • `ZoneId` is harder. It represents an ID of a time zone that in virtually all cases has had and will have different UTC offset through history and future. I don’t see any reasoable way to serialize that to a numeric string, and under no circumstances will the receiver be able to reconstruct the `ZoneId` object at the other end. – Ole V.V. Jan 28 '23 at 12:55
  • And no, I believe there is no support for `+03.00` with a point/dot neither in Jackson nor in java.time. If we can’t get rid of that requirement, I would use a custom serializer and inside that something like `ZoneOffset.ofHours(3).toString().replace(':', '.')` (this gives `+03.00`). – Ole V.V. Jan 28 '23 at 12:58
  • Thank you, I resolved this task by custom serializer with replacing ':' by '.' – trom Jan 29 '23 at 17:02

2 Answers2

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The zone offset, +03:00 is already in the ISO 8601 standard format. Therefore, you should educate the publisher/consumer to stick to it. However, if you want to change it in the desired format for any reason, here is how you can do it:

import java.time.ZoneOffset;

class Main {
    public static void main(String[] args) {
        ZoneOffset offset = ZoneOffset.of("+03:00");
        String formatted = offset.toString().replace(':', '.');
        System.out.println(formatted);
    }
}

Output:

+03.00

Learn more about the modern Date-Time API from Trail: Date Time.

Arvind Kumar Avinash
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2

To resolve this tak I made custom serializer:

object ZoneOffsetSerializer : JsonSerializer<ZoneOffset>() {
    override fun serialize(value: ZoneOffset, jsonGenerator: JsonGenerator, serializers: SerializerProvider) {
        val result = "0".takeIf { value.totalSeconds == 0 } ?: value.toString().replace(':', '.')

        jsonGenerator.writeString(result)
    }
}

and used annotation @JsonSerialize(using = ZoneOffsetSerializer::class) for necessary fields

trom
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