How can I iterate JSONObject to get individual items

Question

This is my below code from which I need to parse the JSONObject to get individual items. This is the first time I am working with JSON. So not sure how to parse JSONObject to get the individual items from JSONObject.

try {     String url = service + version + method + ipAddress + format;     StringBuilder builder = new StringBuilder();     httpclient = new DefaultHttpClient();     httpget = new HttpGet(url);     httpget.getRequestLine();     response = httpclient.execute(httpget);     HttpEntity entity = response.getEntity();     if (entity != null) {         InputStream inputStream = entity.getContent();         bufferedReader = new BufferedReader(new InputStreamReader(inputStream));         for (String line = null; (line = bufferedReader.readLine()) != null;) {             builder.append(line).append("\n");         }         JSONObject jsonObject = new JSONObject(builder.toString());         // Now iterate jsonObject to get Latitude,Longitude,City,Country etc etc.      }  } catch (Exception e) {     getLogger().log(LogLevel.ERROR, e.getMessage()); } finally {     bufferedReader.close();     httpclient.getConnectionManager().shutdown(); } 

My JSON looks like this:

{     "ipinfo": {         "ip_address": "131.208.128.15",         "ip_type": "Mapped",         "Location": {             "continent": "north america",             "latitude": 30.1,             "longitude": -81.714,             "CountryData": {                 "country": "united states",                 "country_code": "us"             },             "region": "southeast",             "StateData": {                 "state": "florida",                 "state_code": "fl"             },             "CityData": {                 "city": "fleming island",                 "postal_code": "32003",                 "time_zone": -5             }         }     } } 

I need to get latitude, longitude, city, state, country, postal_code from the above object. Can anyone provide any suggestion how to do it efficiently?

Answer 1

You can try this it will recursively find all key values in a json object and constructs as a map . You can simply get which key you want from the Map .

public static Map<String,String> parse(JSONObject json , Map<String,String> out) throws JSONException{     Iterator<String> keys = json.keys();     while(keys.hasNext()){         String key = keys.next();         String val = null;         try{              JSONObject value = json.getJSONObject(key);              parse(value,out);         }catch(Exception e){             val = json.getString(key);         }          if(val != null){             out.put(key,val);         }     }     return out; }   public static void main(String[] args) throws JSONException {      String json = "{'ipinfo': {'ip_address': '131.208.128.15','ip_type': 'Mapped','Location': {'continent': 'north america','latitude': 30.1,'longitude': -81.714,'CountryData': {'country': 'united states','country_code': 'us'},'region': 'southeast','StateData': {'state': 'florida','state_code': 'fl'},'CityData': {'city': 'fleming island','postal_code': '32003','time_zone': -5}}}}";      JSONObject object = new JSONObject(json);      JSONObject info = object.getJSONObject("ipinfo");      Map<String,String> out = new HashMap<String, String>();      parse(info,out);      String latitude = out.get("latitude");     String longitude = out.get("longitude");     String city = out.get("city");     String state = out.get("state");     String country = out.get("country");     String postal = out.get("postal_code");      System.out.println("Latitude : " + latitude + " LongiTude : " + longitude + " City : "+city + " State : "+ state + " Country : "+country+" postal "+postal);      System.out.println("ALL VALUE " + out);  } 

Output:

    Latitude : 30.1 LongiTude : -81.714 City : fleming island State : florida Country : united states postal 32003 ALL VALUE {region=southeast, ip_type=Mapped, state_code=fl, state=florida, country_code=us, city=fleming island, country=united states, time_zone=-5, ip_address=131.208.128.15, postal_code=32003, continent=north america, longitude=-81.714, latitude=30.1}