How to use HttpURLConnection POST data to web server?

public static String excutePost(String targetURL, String urlParameters)
{
URL url;
HttpURLConnection connection = null;
try {
//Create connection
url = new URL(targetURL);
connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");

connection.setRequestProperty("Content-Length", "" +
Integer.toString(urlParameters.getBytes().length));
connection.setRequestProperty("Content-Language", "en-US");

connection.setUseCaches (false);
connection.setDoInput(true);
connection.setDoOutput(true);

//Send request
DataOutputStream wr = new DataOutputStream (
connection.getOutputStream ());
wr.writeBytes (urlParameters);
wr.flush ();
wr.close ();

//Get Response
InputStream is = connection.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
String line;
StringBuffer response = new StringBuffer();
while((line = rd.readLine()) != null) {
response.append(line);
response.append('\r');
}
rd.close();
return response.toString();

} catch (Exception e) {

e.printStackTrace();
return null;

} finally {

if(connection != null) {
connection.disconnect();
}
}
}
...

String urlParameters =
"fName=" + URLEncoder.encode("???", "UTF-8") +
"&lName=" + URLEncoder.encode("???", "UTF-8")