Date and Timestamp serialization by Jackson ObjectMapper

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Jackson ObjectMapper is serializing both Date and Timestamp as Long in 2.9.x version whereas Date is serialized as Formatted String in 2.6.x and Timestamp as Long in **2.6.x* version by default.

Example:

case class Test(date: java.sql.Date,  tmp: java.sql.Timestamp)
val test = Test(new java.sql.Date(1588892400000L), new Timestamp(1588892400000L))
writeValueAsString(test)

{"date":"2020-05-08","tmp":1588892400000}//Version 2.6.x 
{"date":1588892400000,"tmp":1588892400000}//Version 2.9.x

But I want to maintain the behavior of 2.6.x version in 2.9.x version.

I tried disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS) but then it is converting both Date & TimeStamp to Formatted String (as below).

{"date":"2020-05-08","tmp":"2020-05-07T23:00:00.000+0000"}

If I set DateFormatter**, then it converts both in the same format.

setDateFormat(new SimpleDateFormat("yyyy-MM-dd"))`
{"date":"2020-05-08","tmp":"2020-05-08"}

**I just treid it but I don't want to set DateFormatter (even if it works) because it will be used for de-serialization too where the input date format is different.

Is there a way to achieve this?

fasterxml jackson serialization scala java
1 Answers

You can use an annotation like this for the Date member:

@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy hh:mm:ss")

EDIT:

Create a class like this:

public class CustomSerializer extends JsonSerializer<Date> {
    @Override
    public void serialize(Date value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  
            String s = sdf.format(value);
            gen.writeString(s);
          } catch (DateTimeParseException e) {
            System.err.println(e);
            gen.writeString("");
          }     
    }
}

and use like this:

ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addSerializer(Date.class, new CustomSerializer());
mapper.registerModule(module);
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