Question

I am working with a web application which accepts json object, parses it and create a User object. I want to give this json input in gson.fromJson(jsonData, User.class);:

 {
   users:[{
   name: "Jack",
   email: "email1",
   friends:[{
       name: "name2",
       email: "email2",

    }]
 }]
} 

what should i do to give this json object in place of jsonData. I am working with google app engine.

Thanks in advance.

Answer 1

If you use Gson, please read doc here.
As jsonData you can pass string with your json or Reader which streams your json data.

UPD: In your case you need to deserialize array, so use it as

String jsonData = "{"
   "users:[{ " +
   "name: 'Jack', " +
   "email: 'email1', " +
   "friends:[{ " +
   "    name: 'name2', " +
   "    email: 'email2', " +
   "  }] " +
   "}] " +
"}";
User[] users = gson.fromJson(jsonData, User[].class); 

GSon uses reflections to set properties, so make sure you have setters for all properties in json, like User.setName, User.setEmail, User.setFriends, ..