Object to JsonObject using GSON

Question

I want to post following string as json to the server.

{ "FirstName": "John", "LastName": "Smith" }, { "FirstName": "John", "LastName": "Smith" }

But if I use below code, I am getting array list of json objects.

Gson gson = new Gson();
Type type = new TypeToken<List<Student>>() {}.getType();
String json = gson.toJson(list, type);

Output:

[{ "FirstName": "John", "LastName": "Smith" }, { "FirstName": "John", "LastName": "Smith" }]

So can anybody help me to achieve this ? Or server guy made a mistake ? I want to submit it as a post method of retrofit library.

Tell the backend Engineer, you are posting array of objects as json, so he/she will parse it accordingly — Pulkit
– Pulkit, Commented Sep 7, 2017 at 6:57

Maxim Shoustin · Accepted Answer · 2017-09-07 07:19:11Z

2

I want to post following string as json to the server.

Suppose you use header: "content-type", "application/json"

The string you posted - is wrong JSON format:

{ "FirstName": "John", "LastName": "Smith" }, { "FirstName": "John", "LastName": "Smith" }

Your output is a right JSON syntax a.e.:

[{ "FirstName": "John", "LastName": "Smith" }, { "FirstName": "John", "LastName": "Smith" }]

So use it

Or server guy made a mistake ?

Looks like. I believe he thought about [{},{}] structure

Anyways if you want to send { "FirstName": "John", "LastName": "Smith" }, { "FirstName": "John", "LastName": "Smith" } - you have nothing to do with Gson. You got list of objects, just remove [, ] from beginning and end

private static String removeLastChar(String str) {
    return str.substring(0, str.length() - 1);
}

public String removeFirstChar(String s){
   return s.substring(1);
}

edited Sep 7, 2017 at 7:19

answered Sep 7, 2017 at 6:58

Maxim Shoustin

78k29 gold badges212 silver badges229 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Smeet Over a year ago

I know this as we have string and we can perform string operation to remove { and }, is there any correct way using gson to achieve this ? Because this is not a correct way to do, otherwise I have to ask server guy that this is not a correct way to do.

Simon Schiller Over a year ago

This is not possible with GSON, as the format you are asking for is not valid JSON

Smeet · Accepted Answer · 2017-09-07 07:58:03Z

1

As stated by Simon, it is not a valid json as I check with JSONLint. So I talked with server guy and changed to valid json like

[{ "FirstName": "John", "LastName": "Smith" }, { "FirstName": "John", "LastName": "Smith" }]

I am posting my answer as it may help to anybody that face such type of issue in future.

answered Sep 7, 2017 at 7:58

Smeet

4,1461 gold badge41 silver badges49 bronze badges

Collectives™ on Stack Overflow

Object to JsonObject using GSON

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related