How to store Date field as ISODate() using jackson in MongoDb

Question

I am trying to persist a java object having java.util.Date field in mongo collection using fasterxml jackson. The problem is the default nature of objectMapper is to store Date as NumberLong type.

For e.g , a createdTime field of java.util.Date type gets stored as below:

"createdTime" : NumberLong("1427728445176")

I want to store it in ISODate format which is available in mongo Shell.

Now, i know there is way to format object mapper to store Date in a String dateformat. But I am ONLY looking for ISODate() format.

For e.g "createdTime" : ISODate("2015-01-20T16:39:42.132Z")

Is there a way to do that ? Please advise gurus . Thanks in advance for help.

Answer 1

What you need is the Jackson Joda Module. If you import that into your classpath, you can do the following on your mapper to write it as your desired Timestamp:

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JodaModule());
mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, true);
mapper.writeValueAsString(date);

You can replace date in the code sample above with your POJO as necessary.

Edit: It looks like what you really want is a custom serializer. That would look something like this:

public class IsoDateSerializer extends JsonSerializer<DateTime> {
    @Override
    public void serialize(DateTime value, JsonGenerator jgen, SerializerProvider provider) {
        String isoDate = ISODateTimeFormat.dateTime().print(value);
        jgen.writeRaw("ISODATE(\"" + isoDate + "\")");
    }

Then you'll either register it on the mapper for all DateTime types

mapper.addSerializer(DateTime.class, new IsoDateSerializer());

or specify it on the function using annotations

@JsonSerializer(using = IsoDateSerializer.class)
public DateTime createdTime;