无法从Android模拟器访问localhost

Question

我试图在同一台机器上的模拟器上运行的Android应用程序中调用在我的localhost中运行的java webservice，这是我的代码：

        String url = "http://10.0.2.2:8080/MobileMiddleware/Registration";
        HttpClient httpclient = new DefaultHttpClient();
        HttpParams myParams = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(myParams, 30000);
        HttpConnectionParams.setSoTimeout(myParams, 30000);
        try {

            HttpPost httppost = new HttpPost(url.toString());
            httppost.setHeader("Content-type", "application/json");
            StringEntity se = new StringEntity(request);
            se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
                    "application/json"));
            httppost.setEntity(se);

            HttpResponse response = httpclient.execute(httppost);
            Result = EntityUtils
                    .toString(response.getEntity());

            Log.d(" return Result>>", Result);

        } 
        catch (ClientProtocolException e) {}
        catch (IOException e) {  }
        return null;
    }

此代码返回错误消息Connection timeout, the gateway could not receive a timely response from the website
请帮忙