how to parse JSON file with GSON

Question

I have a very simple JSON with reviews for products, like:

{
  \"reviewerID\": \"A2XVJBSRI3SWDI\", 
  \"asin\": \"0000031887\", 
  \"reviewerName\": \"abigai         


        

Answer 1

You have to fetch the whole data in the list and then do the iteration as it is a file and will become inefficient otherwise.

private static final Type REVIEW_TYPE = new TypeToken>() {
}.getType();
Gson gson = new Gson();
JsonReader reader = new JsonReader(new FileReader(filename));
List data = gson.fromJson(reader, REVIEW_TYPE); // contains the whole reviews list
data.toScreen(); // prints to screen some values