I am looking for a simple java function that can accept an address and return the longitude and latitude coordinates for that address. Based on my research this is what i found thus far:
I am abit unsure how to implements this. I am not sure what order i will need to call the different methods.
E.g. would i have to do this? :
String address = 'Some Place, Venezuela';
Geocoder geo = new Geocoder();
String url = geo.encode(address);
String encodeUrl = geo.urlEncode(url);
GLatLng latLng = geo.decode(encodeUrl);
If there are others that you have used feel free to share it.
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*
* ==============================================================================
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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* the License.
*/
package org.wicketstuff.gmap.geocoder;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.StringTokenizer;
import org.wicketstuff.gmap.api.GLatLng;
/**
* Geocoder. See: http://www.google.com/apis/maps/documentation/services.html# Geocoding_Direct
*
* @author Thijs Vonk
*/
public class Geocoder implements Serializable
{
private static final long serialVersionUID = 1L;
// Constants
public static final String OUTPUT_CSV = "csv";
public static final String OUTPUT_XML = "xml";
public static final String OUTPUT_KML = "kml";
public static final String OUTPUT_JSON = "json";
private final String output = OUTPUT_CSV;
public Geocoder()
{
}
public GLatLng decode(String response) throws GeocoderException
{
StringTokenizer gLatLng = new StringTokenizer(response, ",");
String status = gLatLng.nextToken();
gLatLng.nextToken(); // skip precision
String latitude = gLatLng.nextToken();
String longitude = gLatLng.nextToken();
if (Integer.parseInt(status) != GeocoderException.G_GEO_SUCCESS)
{
throw new GeocoderException(Integer.parseInt(status));
}
return new GLatLng(Double.parseDouble(latitude), Double.parseDouble(longitude));
}
/**
* builds the google geo-coding url
*
* @param address
* @return
*/
public String encode(final String address)
{
return "http://maps.google.com/maps/geo?q=" + urlEncode(address) + "&output=" + output;
}
/**
* @param address
* @return
* @throws IOException
*/
public GLatLng geocode(final String address) throws IOException
{
InputStream is = invokeService(encode(address));
if (is != null)
{
try
{
String content = org.apache.wicket.util.io.IOUtils.toString(is);
return decode(content);
}
finally
{
is.close();
}
}
return null;
}
/**
* fetches the url content
*
* @param address
* @return
* @throws IOException
*/
protected InputStream invokeService(final String address) throws IOException
{
URL url = new URL(address);
return url.openStream();
}
/**
* url-encode a value
*
* @param value
* @return
*/
private String urlEncode(final String value)
{
try
{
return URLEncoder.encode(value, "UTF-8");
}
catch (UnsupportedEncodingException ex)
{
throw new RuntimeException(ex.getMessage());
}
}
}
