java - Create JSONObject from POJO

Question

I created a simple POJO:

public class LoginPojo {
    private String login_request = null;
    private String email = null;
    private String password = null;

    // getters, setters
}

After some searching I found this: JSONObject jsonObj = new JSONObject( loginPojo );

But with this I got the error:

The constructor JSONObject(LoginPojo) is undefined

I found another solution:

JSONObject loginJson = new JSONObject();
loginJson.append(loginPojo);

But this method does not exist.

So how can I convert my POJO into a JSON?

Answer 1

Simply use the java Gson API:

Gson gson = new GsonBuilder().create();
String json = gson.toJson(obj);// obj is your object 

And then you can create a JSONObject from this json String, like this:

JSONObject jsonObj = new JSONObject(json);

Take a look at Gson user guide and this SIMPLE GSON EXAMPLE for more information.