Extracting JSON fields using java

Question

I am trying to extract a person\'s details who liked a facebook page by passing the page id as parameter. I extracted the JSON content of that page and now from that I want

Answer 1

Code like this would do the trick.

JSONObject json = readurl("https://graph.facebook.com/pageid");
JSONArray dataJsonArray = json.getJSONArray("data");
for(int i=0; i<dataJsonArray.length; i++) {
   JSONObject dataObj = dataJsonArray.get(i);
   String id = dataObj.getString("id");
   //Similarly you can extract for other fields.
}

Basically data is a JSONArray since it starts with [. So simply get would not work, you must use JSONArray.

Note: I haven't compiled this code, but I think I gave you idea to proceed. Also refer this link to get hold of basics of parsing JSON in java.

Answer 2

This snippet is not tested, but I'm pretty sure it works:

JSONArray data = json.getJSONArray("data");
for (int i=0; i < data.length(); i++) {
    JSONObject o = data.getJSONObject(i);
    sysout(o.getString("id");
    sysout(o.getString("name");
}

Answer 3

I use google's Gson library from: https://code.google.com/p/google-gson/