CODEWITHSUNDEEP
javajsongson
Totic
Totic

Reputation: 1291

Question on deserializing Json using Gson

Hi how do I deserialize json objects of the type?

 {"photo":{"id":5, "url":"http://pics.com/pic1.jpg"}};

Because normally I would create a Class:

public class Photo{
  private int id;
  private String url;

  public Photo(){
   }    
}

And then just run it using:

  GsonBuilder gsonb = new GsonBuilder();
  Gson gson = gsonb.create();      
  Photo photo = gson.fromJson(response, Photo.class);

But that just fills everything with nulls. It would work if I the Json was only

 {"id":5, "url":"http://pics.com/pic1.jpg"}

Any ideas?

Thanks

Upvotes: 4

Views: 928

Answers (2)

huo73
huo73

Reputation: 599

Create another class that has the Photo class as property

public class PhotoRoot {

  private Photo photo;

  public void setPhoto(Photo val) {
    photo = val;
  }

  public Photo getPhoto() {
    return photo;
  }

}

Then Parse it like

GsonBuilder gsonb = new GsonBuilder();
Gson gson = gsonb.create();      
PhotoRoot photoRoot = gson.fromJson(response, PhotoRoot.class);

Photo yourPhoto = photoRoot.getPhoto();

Regards

Upvotes: 3

dogbane
dogbane

Reputation: 274838

Your json structure is not valid. You need to change it to

 {"id":5, "url":"http://pics.com/pic1.jpg"}

to match your Photo class.

The reason why {"photo":{"id":5, "url":"http://pics.com/pic1.jpg"}} doesn't work is that GSON looks for a property called photo within your Photo class which doesn't exist.

Upvotes: 0

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