Spring controller return different date format

Question

I have a spring controller return an entity in json. The entity contains a date and I want to return EITHER 12hours format OR 24hours format according to one field in the entity. Does Spring or jackson provides such kind of feature?

@RequestMapping(value = "/{systemName}",method = RequestMethod.GET)
public Entity getEntityByName(@PathVariable String name,HttpServletResponse response){
Entity entity = service.getEntity(name);
    if(entity ==null){
        response.setStatus(404);
    }
    return entity ;

}

How is the code sample related to your question?

rudolf_franek
– rudolf_franek

2017-04-26 19:47:02 +00:00
Commented Apr 26, 2017 at 19:47 — rudolf_franek
– rudolf_franek, Commented Apr 26, 2017 at 19:47

Vaibs · Accepted Answer · 2017-04-27 09:20:05Z

2

In Jackson 2 and above

@JsonFormat(shape = JsonFormat.Shape.STRING ,pattern = "dd-MM-YYYY hh:mm:ss" , timezone="UTC")
private Date from_date;

answered Apr 27, 2017 at 9:20

Vaibs

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2 Comments

Dong Hang Over a year ago

This only changeS the date pattern to dd-MM-YYYY hh:mm:ss, whereas I needed it to be configurable into different patterns.

Vaibs Over a year ago

Refer stackoverflow.com/questions/18734452/…. you need to change the pattern.

lane.maxwell · Accepted Answer · 2017-04-26 18:17:37Z

In short, yes this is possible. With that said, I would encourage you to return a numeric representation of the date and leave it up to your consumers to display it however they want. Here is a means for achieving what you want.

Create a class that will serve as the Serializer for the Entity Object.

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;

public class EntitySerializer extends JsonSerializer<Entity> {
   @Override
   public void serialize(Entity entity, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {

       jsonGenerator.writeStartObject();
       jsonGenerator.writeStringField("name", entity.getName());

       if (entity.getFieldThatIndicates24HourFormat()) {
          jsonGenerator.writeStringField("date", entity.getDate().toString());
       } else {
          jsonGenerator.writeStringField("date", entity.getDate().toString());
       }

       jsonGenerator.writeEndObject();
   }
}

On your Entity, add an annotation that will enable this class to be used for serializing it.

import com.fasterxml.jackson.databind.annotation.JsonSerialize;

@JsonSerialize(using = EntitySerializer.class)
public class Entity {

There are obvious pitfalls with this, as you now will have to be mindful of changes to your Entity and update the serializer accordingly.

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