Авторизоваться на сайте и сделать get, будучи авторизованным

 public static void main(String[] args){
 
        String url = "https://www.mql5.com/ru/auth_login";
        String mql5 = "https://www.mql5.com/ru/";
 
        MQL5 http = new MQL5();
 
        // make sure cookies is turn on
        CookieHandler.setDefault(new CookieManager());
 
        // 1. Send a "GET" request, so that you can extract the form's data.
        String page = null;
        try {
            page = http.GetPageContent(url);
 
            String postParams = http.getFormParams(page);
 
            // 2. Construct above post's content and then send a POST request for
            // authentication
            http.sendPost(url, postParams);
 
            // 3. success then go to gmail.
            String result = http.GetPageContent(mql5);
            System.out.println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
 
    }
 
 
    private void sendPost(String url, String postParams) throws Exception {
 
        URL obj = new URL(url);
        conn = (HttpsURLConnection) obj.openConnection();
 
        // Acts like a browser
        conn.setUseCaches(false);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Host", "www.mql5.com");
        conn.setRequestProperty("User-Agent", USER_AGENT);
        conn.setRequestProperty("Accept",
                "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
        conn.setRequestProperty("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3");
        for (String cookie : this.cookies) {
            conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
        }
        conn.setRequestProperty("Connection", "keep-alive");
        conn.setRequestProperty("Referer",
                "https://www.mql5.com/ru/auth_login");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        conn.setRequestProperty("Content-Length", Integer.toString(postParams.length()));
 
        conn.setDoOutput(true);
        conn.setDoInput(true);
 
        // Send post request
        DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
        wr.writeBytes(postParams);
        wr.flush();
        wr.close();
 
        int responseCode = conn.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + url);
        System.out.println("Post parameters : " + postParams);
        System.out.println("Response Code : " + responseCode);
 
        BufferedReader in =
                new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
 
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
 
        in.close();
         System.out.println(response.toString());
 
    }
 
    private String GetPageContent(String url) throws Exception {
 
        URL obj = new URL(url);
        conn = (HttpsURLConnection) obj.openConnection();
 
        // default is GET
        conn.setRequestMethod("GET");
 
        conn.setUseCaches(false);
 
        // act like a browser
        conn.setRequestProperty("User-Agent", USER_AGENT);
        conn.setRequestProperty("Accept",
                "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
        conn.setRequestProperty("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3");
        if (cookies != null) {
            for (String cookie : this.cookies) {
                conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
            }
        }
        int responseCode = conn.getResponseCode();
        System.out.println("\nSending 'GET' request to URL : " + url);
        System.out.println("Response Code : " + responseCode);
 
        BufferedReader in =
                new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
 
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
 
        // Get the response cookies
        setCookies(conn.getHeaderFields().get("Set-Cookie"));
/*
    List<String>cook1= new ArrayList<>();
       cook1= conn.getHeaderFields().get("Cookie");
        System.out.println("hrewejerj" + conn.getHeaderFields().get("Set-Cookie"));
        for (String cook: cook1){
            System.out.println(cook);
        }*/
 
        return response.toString();
 
    }
 
    public String getFormParams(String html)
            throws UnsupportedEncodingException {
 
        System.out.println("Extracting form's data...");
 
        Document doc = Jsoup.parse(html);
 
        
    
        List<String> paramList = new ArrayList<String>();
 
        paramList.add("Login" + "=" + URLEncoder.encode("usertestjava3", "UTF-8"));
        paramList.add("Password" + "=" + URLEncoder.encode("Nsa2qHtQ", "UTF-8"));
 
        paramList.add("RedirectAfterLoginUrl" + "=" + URLEncoder.encode("https://www.mql5.com/ru", "UTF-8"));
 
        paramList.add("RememberMe" + "=" + URLEncoder.encode("false", "UTF-8"));
 
 
 
 
        // build parameters list
        StringBuilder result = new StringBuilder();
        for (String param : paramList) {
            if (result.length() == 0) {
                result.append(param);
            } else {
                result.append("&" + param);
            }
        }
        return result.toString();
    }
 
    public List<String> getCookies() {
        return cookies;
    }
 
    public void setCookies(List<String> cookies) {
        this.cookies = cookies;
 
    }