HttpURLConnection.java

static public void getCookie() throws IOException
    {

        HttpURLConnection HttpConn;
        URL Url = new URL(INDEX_URL);

        HttpConn = (HttpURLConnection) Url.openConnection();
        System.out.println(HttpConn);

        HttpConn.setConnectTimeout(15000);
        HttpConn.setReadTimeout(10000);
        HttpConn.setRequestMethod("GET");
        HttpConn.setDoInput(true);
        HttpConn.setDoOutput(false);

        //start the query
        HttpConn.connect();
        int response = HttpConn.getResponseCode();//http 200,403 ......
        if(response == 200)
        {
            String Session_header = HttpConn.getHeaderField("Set-Cookie");
            if(Session_header != null)
            {
                cookieManager.getCookieStore().add(null, HttpCookie.parse(Session_header).get(0));
            }
        }
        else
        {
            System.out.println("GG");
            throw new IOException();
        }
    }