Question

In the project, I have to send complex JSON commands form the server to the client. Is it effective to generate JSONObjects ( Strings, Numbers, etc.) convert them to the string and then send them via RequestBuilder or is there a more effective method.

Is it effective to convert JSON objects to string (via the .toString method on the Object)

Code example:

    JSONObject retObject = new JSONObject();
    retObject.put("NumberVar", new JSONNumber(1));
    retObject.put("StringVar", new JSONString("HelloWorld"));

    JSONArray arrayVar= new JSONArray();
    for (int i = 0; i < 5; i++) {
        arrayVar.set(i,
                new JSONString("Array"));
    }
    retObject.put("EventParameters", arrayVar);

    System.out.println(retObject.toString());

Output:

{"NumberVar":1, "StringVar":"HelloWorld", "EventParameters":["Array","Array","Array","Array","Array"]}

Regards,
Stefan

Answer 1

The solution you have will work.

If you want to do it more efficiently, and you only want to support modern browsers with support for JSON.stringify(), you can work in JavaScriptObjects instead of JSONObjects and use this native method:

private static native String stringify(JavaScriptObject jso) /*-{
  return JSON.stringify(jso);
}-*/;

Alternatively, you can stringify a JSO by doing:

String json = new JSONObject(jso).toString();

JavaScriptObjects are more efficient because they are represented in the final compiled code as JS objects, while JSONObjects are represented as emulated Java objects. The second solution will mean less overhead while you construct the JSO, but comparatively more (than the first) when you stringify it.

Your solution will work just fine though.