(Java) Google Maps Geolocation Request

Demonstrates how make a Google Maps Geolocation REST API request.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example duplicates the following CURL request:
    // curl -d @your_filename.json -H "Content-Type: application/json" -i "https://www.googleapis.com/geolocation/v1/geolocate?key=YOUR_API_KEY"

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkRest rest = new CkRest();

    // Connect to the Google API REST server.
    boolean bTls = true;
    int port = 443;
    boolean bAutoReconnect = true;
    boolean success = rest.Connect("www.googleapis.com",port,bTls,bAutoReconnect);

    // Add the Content-Type request header.
    rest.AddHeader("Content-Type","application/json");

    // Add your API key as a query parameter
    rest.AddQueryParam("key","YOUR_API_KEY");

    // The JSON query is contained in the body of the HTTP POST.
    // This is a sample query (which we'll dynamically build in this example)
    // { 
    //  "homeMobileCountryCode": 310,
    //  "homeMobileNetworkCode": 260,
    //  "radioType": "gsm",
    //  "carrier": "T-Mobile",
    //  "cellTowers": [
    //   {
    //    "cellId": 39627456,
    //    "locationAreaCode": 40495,
    //    "mobileCountryCode": 310,
    //    "mobileNetworkCode": 260,
    //    "age": 0,
    //    "signalStrength": -95
    //   }
    //  ],
    //  "wifiAccessPoints": [
    //   { 
    //    "macAddress": "01:23:45:67:89:AB",
    //    "signalStrength": 8,
    //    "age": 0,
    //    "signalToNoiseRatio": -65,
    //    "channel": 8
    //   },
    //   { 
    //    "macAddress": "01:23:45:67:89:AC",
    //    "signalStrength": 4,
    //    "age": 0
    //   }
    //  ]
    // }

    CkJsonObject json = new CkJsonObject();
    json.AppendInt("homeMobileCountryCode",310);
    json.AppendInt("homeMobileNetworkCode",260);
    json.AppendString("radioType","gsm");
    json.AppendString("carrier","T-Mobile");
    CkJsonArray aCellTowers = json.AppendArray("cellTowers");
    aCellTowers.AddObjectAt(0);
    CkJsonObject oCellTower = aCellTowers.ObjectAt(0);
    oCellTower.AppendInt("cellId",39627456);
    oCellTower.AppendInt("locationAreaCode",40495);
    oCellTower.AppendInt("mobileCountryCode",310);
    oCellTower.AppendInt("mobileNetworkCode",260);
    oCellTower.AppendInt("age",0);
    oCellTower.AppendInt("signalStrength",-95);

    CkJsonArray aWifi = json.AppendArray("wifiAccessPoints");
    aWifi.AddObjectAt(0);
    CkJsonObject oPoint = aWifi.ObjectAt(0);
    oPoint.AppendString("macAddress","01:23:45:67:89:AB");
    oPoint.AppendInt("signalStrength",8);
    oPoint.AppendInt("age",0);
    oPoint.AppendInt("signalToNoiseRatio",-65);
    oPoint.AppendInt("channel",8);

    aWifi.AddObjectAt(1);
    oPoint = aWifi.ObjectAt(1);
    oPoint.AppendString("macAddress","01:23:45:67:89:AC");
    oPoint.AppendInt("signalStrength",4);
    oPoint.AppendInt("age",0);

    String responseJson = rest.fullRequestString("POST","/geolocation/v1/geolocate",json.emit());
    if (rest.get_LastMethodSuccess() != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    // When successful, the response code is 200.
    if (rest.get_ResponseStatusCode() != 200) {
        // Examine the request/response to see what happened.
        System.out.println("response status code = " + rest.get_ResponseStatusCode());
        System.out.println("response status text = " + rest.responseStatusText());
        System.out.println("response header: " + rest.responseHeader());
        System.out.println("response JSON: " + responseJson);
        System.out.println("---");
        System.out.println("LastRequestStartLine: " + rest.lastRequestStartLine());
        System.out.println("LastRequestHeader: " + rest.lastRequestHeader());
        return;
        }

    json.put_EmitCompact(false);
    System.out.println("JSON request body: " + json.emit());

    // The JSON response should look like this:
    // { 
    //  "location": {
    //   "lat": 37.4248297,
    //   "lng": -122.07346549999998
    //  },
    //  "accuracy": 1145.0
    // }

    System.out.println("JSON response: " + responseJson);

    CkJsonObject jsonResp = new CkJsonObject();
    jsonResp.Load(responseJson);

    CkJsonObject jsonLoc = jsonResp.ObjectOf("location");
    // Any JSON value can be obtained as a string..
    String latitude = jsonLoc.stringOf("lat");
    System.out.println("latitude = " + latitude);
    String longitude = jsonLoc.stringOf("lng");
    System.out.println("longitude = " + longitude);

    String accuracy = jsonResp.stringOf("accuracy");
    System.out.println("accuracy = " + accuracy);
  }
}