here is some code i use to consume a web service using GET, but not post. sorry it's not much help. good luck.
Code:
URL productURLRequest;
BufferedReader in;
String productURLResponse;
// read url
productURLRequest = new URL("http://www.myserver.com/lookup.php?ProdID=someproduct");
in = new BufferedReader(new InputStreamReader(productURLRequest.openStream()));
if((productURLResponse = in.readLine()) == null)
productURLResponse = "0";
in.close();