How to parse a JSON Input stream

Question

I am using java to call a url that returns a JSON object:

url = new URL(\"my URl\");
urlInputStream = url.openConnection().getInputStream();

<

Answer 1

Kotlin version with Gson

to read the response JSON:

val response = BufferedReader(
                   InputStreamReader(conn.inputStream, "UTF-8")
               ).use { it.readText() }

to parse response we can use Gson:

val model = Gson().fromJson(response, YourModelClass::class.java)

Answer 2

{
    InputStream is = HTTPClient.get(url);
    InputStreamReader reader = new InputStreamReader(is);
    JSONTokener tokenizer = new JSONTokener(reader);
    JSONObject jsonObject = new JSONObject(tokenizer);
}

Answer 3

if you have JSON file you can set it on assets folder then call it using this code

InputStream in = mResources.getAssets().open("fragrances.json"); 
// where mResources object from Resources class

Answer 4

use jackson to convert json input stream to the map or object http://jackson.codehaus.org/

there are also some other usefull libraries for json, you can google: json java

Answer 5

I suggest use javax.json.Json factory as less verbose possible solution:

JsonObject json = Json.createReader(yourInputStream).readObject();

Enjoy!