Java : Google Reverse Geocoding with jackson API - spring

Question

I want to get the address using the google Maps API. In my project we are using Jackson parser.
I want to know that, how can i get my expected result i.e. :-
"A10, Dhamidhar Rd, Yashkamal Society, Vasna, Ahmedabad, Gujarat 380007, India"
I want to ignore all other fields in the API. As there are too many objects in the json file.
only want to fetch :
" "formatted_address" : "A10, Dhamidhar Rd, Yashkamal Society, Vasna, Ahmedabad, Gujarat 380007, India","
http://maps.google.com/maps/api/geocode/json?latlng=23.0043673,72.5411868999996&sensor=false
Thank you
This is what I have tried
package com.example.api.batch;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.util.JSONPObject;
public class GeocodeAddressParser {
#SuppressWarnings("deprecation")
public void getLocationInfo( String lat, String lng) throws JsonProcessingException, IOException {
HttpGet httpGet = new HttpGet("http://maps.google.com/maps/api/geocode/json?latlng="+lat+","+lng+"&sensor=false");
#SuppressWarnings("resource")
HttpClient client = new DefaultHttpClient();
HttpResponse response;
StringBuilder stringBuilder = new StringBuilder();
try {
response = client.execute(httpGet);
HttpEntity entity = response.getEntity();
InputStream stream = entity.getContent();
int b;
while ((b = stream.read()) != -1) {
stringBuilder.append((char) b);
}
} catch (ClientProtocolException e) {
} catch (IOException e) {
}
ObjectMapper mapper = new ObjectMapper();
JsonNode array = mapper.readValue(stringBuilder.toString(), JsonNode.class);
JsonNode object = array.get(0);
String reportKey = object.get("results").textValue();
// logger.info("ExportController : generatesExportExcel : parameters: {}", reportKey);
// System.out.println("Map Keys:\n"+rawData.getStatus());
//
// List<GeocodeGetResult> locations = rawData.getResults();
//
//
// for(int i=0; i < locations.size(); i++){
// GeocodeGetResult object = locations.get(i);
// System.out.println(object);
// }
// for(int i=0; i < locations.size(); i++){
// SourceLocation object = locations.get(i);
// //System.out.println(object.getClass().getName()+" "+object);
// SourceLocation converted = convertSourceLocation(object);
// System.out.println(converted);
// toBeInserted.add(converted);
// }
// JSONPObject jsonObject = new JSONPObject();
// try {
// // ObjectNode node = mapper.createObjectNode();
// JsonNode actualObj = mapper.readTree(stringBuilder.toString());
// // jsonObject = new JSONObject();
// } catch (JsonParseException e) {
// e.printStackTrace();
// }
// return mapper;
}
public static void main(String[] args) throws JsonProcessingException, IOException{
GeocodeAddressParser ref = new GeocodeAddressParser();
ref.getLocationInfo("23.0043673","72.5411868999996");
// ObjectMapper location;
// String location_string;
// try {
// //Get JSON Array called "results" and then get the 0th complete object as JSON
// location = ret.getJSONArray("results").getJSONObject(0);
// // Get the value of the attribute whose name is "formatted_string"
// location_string = location.getString("formatted_address");
// Log.d("test", "formattted address:" + location_string);
// } catch (JSONException e1) {
// e1.printStackTrace();
//
// }
}
}

Answer 1

Change your getLocationInfo method and replace the following part.
ObjectMapper mapper = new ObjectMapper();
JsonNode array = mapper.readValue(stringBuilder.toString(), JsonNode.class);
JsonNode object = array.get("results").get(0);
String reportKey = object.get("formatted_address").textValue();
System.out.println(reportKey);
In your given code,
JsonNode object = array.get(0);
This will return null(object contains null), because the result from the api link will return a object not an array. So, there is no 0 element here.