android and node.js

Im trying to connect to a nodejs server through my android client but i cant even make the connection.. I tried to follow some tutorials but in vain.. How can i send a json object to the nodejs server..

try{
    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpPost request = new HttpPost();
    request.setHeader("Content-type", "application/json");

    URI uri = new URI("http://192.168.1.100:8080/"); 
    request.setURI(uri);
    JSONObject json = new JSONObject();
    Log.i("request", "OBject made");
    json.put("users", et.getText().toString());
    StringEntity se = new StringEntity(json.toString());
    Log.i("request", "String Entity made");
    se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
    request.setEntity(se);
    Log.i("request", "Set String Entity made");
    HttpResponse response = httpClient.execute(request);
    tv.setText(response.getEntity().getContent().toString());

    }
    catch(Exception ex)
    {
        ex.printStackTrace();
    }