问如何连接到网页，获取状态码以检查网页是否可用

EN

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        output3 = findViewById(R.id.output3);
        output3.setMovementMethod(ScrollingMovementMethod.getInstance());
        connection();
    }

public void connection(){

        try {
            String packagename = "com.facebook.katana";
            URL url = new URL("http://play.google.com/store/apps/details?id="+packagename+"&hl=en");

            URLConnection urlConn = url.openConnection();
            HttpURLConnection con = (HttpURLConnection) urlConn;
            con.setUseCaches(false);
            con.setAllowUserInteraction(false);
            con.setRequestMethod("GET");

            con.connect();

            int status = con.getResponseCode();

            if (status == HttpURLConnection.HTTP_NOT_FOUND){
                output3.append("not from google play store");
            }
            if (status == HttpURLConnection.HTTP_OK) {
                output3.append("google App Store");
            }
            if (status != HttpsURLConnection.HTTP_NOT_FOUND && status != HttpsURLConnection.HTTP_OK)
                output3.append("Other Response");

            con.disconnect();

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (ProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }