Java – Configure date-time format for JODA in Jackson when deserializing

jacksonjavajodatime

I am using "Full Data Binding" in Jackson to deserialize a date in a JSON string.

The format these dates are coming is "EEE MMM dd HH:mm:ss zzz yyyy".

I'm using Jackson 1.8 and I cannot figure out how to configure the ObjectMapper so it would deserialize these Strings properly into JODA DateTime objects.

Snippet from the POJO:

private DateTime deliveryTime;

@JsonProperty("DeliveryTime")
public void setDeliveryTime(DateTime deliveryTime) {
    this.deliveryTime = deliveryTime;
}

@JsonProperty("DeliveryTime")
public DateTime getDeliveryTime() {
    return deliveryTime;
}

Thanks.

Best Answer

The simplest way to configure ObjectMapper to use specific date/time format is to call ObjectMapper.setDateFormat(...) method.

There are some preliminary plans in creating a new Joda datatype Jackson module, as that would make it much easier to add powerful new configuration; current challenge being that Jackson itself should not have hard (static) dependency to external libraries (as much as I like Joda personally!), which limits degree to which lib-specific configurability can work.

Related Solutions

Java – Number of days between two dates in Joda-Time

Annoyingly, the withTimeAtStartOfDay answer is wrong, but only occasionally. You want:

Days.daysBetween(start.toLocalDate(), end.toLocalDate()).getDays()

It turns out that "midnight/start of day" sometimes means 1am (daylight savings happen this way in some places), which Days.daysBetween doesn't handle properly.

// 5am on the 20th to 1pm on the 21st, October 2013, Brazil
DateTimeZone BRAZIL = DateTimeZone.forID("America/Sao_Paulo");
DateTime start = new DateTime(2013, 10, 20, 5, 0, 0, BRAZIL);
DateTime end = new DateTime(2013, 10, 21, 13, 0, 0, BRAZIL);
System.out.println(daysBetween(start.withTimeAtStartOfDay(),
                               end.withTimeAtStartOfDay()).getDays());
// prints 0
System.out.println(daysBetween(start.toLocalDate(),
                               end.toLocalDate()).getDays());
// prints 1

Going via a LocalDate sidesteps the whole issue.

Java – Converting a date string to a DateTime object using Joda Time library

Use DateTimeFormat:

DateTimeFormatter formatter = DateTimeFormat.forPattern("dd/MM/yyyy HH:mm:ss");
DateTime dt = formatter.parseDateTime(string);

Best Answer

Related Solutions

Java – Number of days between two dates in Joda-Time

Java – Converting a date string to a DateTime object using Joda Time library

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