Question

I want city name from IP address using Java

is there any idea to do this ?

Answer 1

From Andrey link, here is how to construct the inquiry, this code will return an HTML file with all details of current IP, including city;

String IP= "123.123.123.123";
URL link = new URL("http://www.geobytes.com/IpLocator.htm?GetLocation&template=php3.txt&IpAddress="+IP);

BufferedReader in = new BufferedReader(new InputStreamReader(link.openStream()));
String inputLine;

while ((inputLine = in.readLine()) != null){
     System.out.println(inputLine);             
}

in.close();

UPDATE, 23 May 2013

The previous answer is ok, but it’s not an API call, it reads an HTML page, that I provided previously because I didn’t find any free APIs. Next is a REST API call that can be used easily and will return all the info required, it’s recommended to use this one:

String ip = "2.51.255.200"; 
URL url = new URL("http://freegeoip.net/csv/" + ip);
connection = (HttpURLConnection) url.openConnection();
connection.connect();

InputStream is = connection.getInputStream();

int status = connection.getResponseCode();
if (status != 200) {
    return null;
}

reader = new BufferedReader(new InputStreamReader(is));
for (String line; (line = reader.readLine()) != null;) {
    //this API call will return something like:
    "2.51.255.200","AE","United Arab Emirates","03","Dubai","Dubai","","x-coord","y-coord","",""
    // you can extract whatever you want from it
}