If you want to connect to the computer which is running the Android simulator, use the IP address 10.0.2.2. You can read more about it here.
Also check out the accepted answer in following question to see how json can be send as post data:
How to send POST request in JSON using HTTPClient?
you can use following code to make HTTP get request:
try {
HttpClient client = new DefaultHttpClient();
String getURL = "http://10.0.2.2:port/your_path_with_parameter";
HttpGet get = new HttpGet(getURL);
HttpResponse responseGet = client.execute(get);
HttpEntity resEntityGet = responseGet.getEntity();
if (resEntityGet != null) {
//do something with the response
Log.i("GET RESPONSE",EntityUtils.toString(resEntityGet));
}
} catch (Exception e) {
e.printStackTrace();
}