Read and write Json properties using methods (ie. getters & setters)

if your object has an int getId(); method. Maybe you want to have a 

@Field("id")
public int getId();

When the Json is generated the getId() method is called and the result is 
placed in "id"
I know that I could have a int field in my class, but, in my case the Id is 
generate by Hibernate once the object is saved.

Original issue reported on code.google.com by Germanattanasio on 7 Sep 2010 at 2:04

[rajsrivastav1919]

@erik777 Here is an implementation for the same if you want to use getter/setter methods. I’ve added a flag to tell Gson whether to use getter/setter methods or work in the default way.

Though I agree with @inder123 that ideally Gson should be defaulting to using reflection to set fields. Otherwise, it won’t be a pure Gson serialisation/deserialisation library (which it is meant for). An object serialised via Gson should exactly give the same object when deserialised with it, which will not be always true if using getter/setter methods. Hence, only getter/setter implementation is not suitable here. Still, I would appreciate if Gson at least decides to include flag based approach in their code, because in some or other case, its useful.

[mattbushell]

I need this feature; i know i could use a TypeAdapter, but this option would be more succinct

Usecase normalising data I do not control:

public class SomeResponse {
	@SerializedName("SomeObject")
	Map<Integer, SomeObject> idSomeObjectMap;

	public void setIdSomeObjectMap(Map<Integer, SomeObject> idSomeObjectMap) {
		this.idSomeObjectMap = idSomeObjectMap;

		//need to put ids on objects
		idSomeObjectMap.entrySet().stream().forEach(me -> me.getValue().setSomeObjectID(me.getKey()));
	}

	public static class SomeObject {
		Integer someObjectsID;

		@SerializedName("N")
		String someObjectsName;

		public void setSomeObjectID(Integer someObjectID) {
			this.someObjectsID = someObjectID;
		}
	}
}

Response for example:

"SomeObject": {
      "173": {
        "N": "SomeObject has a name"
      },
      "246": {
        "N": "SomeObject also has a name"
      }
}