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

Maxim Shoustin Maxim Shoustin · Accepted Answer · 2017-09-07T06:58:23

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);
}

Object to JsonObject using GSON

2 Answers