POST请求未正确发送？

Question

我试图登录＆＃34; Udemy.com＆＃34;使用HttpUrlConnection库以及我已经完成的工作。

• 发送＆＃34; GET＆＃34;到登录页面获取cookie和crsftoken。
• 发送＆＃34; POST＆＃34;以前获得的饼干和所有必要的参数。

我得到了＃34; 200＆＃34;发送POST后的响应代码，但是当我打开从响应中获得的HTML时，它并没有显示我登录页面。几天来我一直在弄乱标题属性，但是没有意识到什么是错的。

public final String urlGet = "https://www.udemy.com/join/login-popup/?displayType=ajax&display_"
        + "type=popup&showSkipButton=1&returnUrlAfterLogin=https%3A%2F%2Fwww.udemy.com%2F&next"
        + "=https%3A%2F%2Fwww.udemy.com%2F&locale=pt_BR";
public final String urlPost = "https://www.udemy.com/join/login-popup/?displayType=ajax&display_type"
        + "=popup&showSkipButton=1&returnUrlAfterLogin=https%3A%2F%2Fwww.udemy.com%"
        + "2F&next=https%3A%2F%2Fwww.udemy.com%2F&locale=pt_BR";
public final String USER_AGENT = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.97 Safari/537.36";

public static void main(String[] args) throws IOException {
    UdemyCoupon uc = new UdemyCoupon();
    //  uc.getCouponEachPage();
    //     uc.readArrayList();
    uc.sendGetLogin();
    uc.sendPostLogin();
   // uc.sendGetApplyCoupon();
}

Date date = new Date();
private ArrayList<String> urls = new ArrayList<>();
private List<String> cookies;
private String cookiesArray[] = new String[100];
private String cookieTotal = "";

public String[] sendGetLogin() throws MalformedURLException, IOException {
    HttpsURLConnection urlConnection
            = (HttpsURLConnection) new URL(urlGet)
            .openConnection();

    cookies = urlConnection.getHeaderFields().get("Set-Cookie");
    for (int i = 0; i < cookies.size(); i++) {
        if (cookies.get(i).contains(";")) {
            cookiesArray[i] = cookies.get(i).split(";")[0];
            System.out.println(i + " - " + cookiesArray[i]);
        }
    }
    return cookiesArray;
}

public int sendPostLogin() throws IOException {

    URL obj = new URL(urlPost);

    System.out.println("\nConnecting ...");
    HttpsURLConnection con;
    con = (HttpsURLConnection) obj.openConnection();

    int posTokenArray = 0;
    for (int i = 0; i < cookies.size(); i++) {
        cookieTotal += cookiesArray[i];
        if (i < cookies.size() - 1) {
            cookieTotal += "; ";
        }

        if (cookiesArray[i].contains("csrftoken")) {
            posTokenArray = i;
        }
    }

    con.setUseCaches(false);
    con.setRequestMethod("POST");
    con.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
    con.setRequestProperty("Accept-Encoding", "gzip, deflate");
    con.setRequestProperty("Accept-Language", "pt-PT,pt;q=0.8,en-US;q=0.6,en;q=0.4");
    con.setRequestProperty("Cache-Control", "max-age=0");
    con.setRequestProperty("Connection", "keep-alive");
    con.setRequestProperty("Content-Length", "128");
    con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    con.setRequestProperty("Cookie", cookieTotal);
    con.setRequestProperty("Host", "www.udemy.com");
    con.setRequestProperty("Origin", "https://www.udemy.com");
    con.setRequestProperty("Referer", "https://www.udemy.com/join/login-popup/?displayType=ajax&display_type=popup&showSkipButton=1&returnUrlAfterLogin=https%3A%2F%2Fwww.udemy.com%2F&next=https%3A%2F%2Fwww.udemy.com%2F&locale=pt_BR");
    con.setRequestProperty("Upgrade-Insecure-Requests", "1");
    con.setRequestProperty("User-Agent", USER_AGENT);

    con.setDoOutput(true);
    con.setDoInput(true);
    String postParams = "csrfmiddlewaretoken="+ cookiesArray[posTokenArray].split("=")[1] +"&locale=pt_BR&email="+URLEncoder.encode("testudemy@hmamail.com", "UTF-8")+
            "&password=" + URLEncoder.encode("testpass", "UTF-8")+"&submit=Acessar";

    DataOutputStream wr = new DataOutputStream(con.getOutputStream());
    wr.writeBytes(postParams);
    wr.flush();
    wr.close();

    System.out.println("\nSending 'POST' request to URL : " + urlPost);
    System.out.println("Post parameters : " + postParams);
    System.out.println("Response Code : " + con.getResponseCode());
    System.out.println("Cookies : " + cookieTotal);
    System.out.println("csrfmiddlewaretoken " + cookiesArray[posTokenArray].split("=")[1]);

    BufferedReader in
            = new BufferedReader(new InputStreamReader(con.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    System.out.println(response);

    in.close();
    con.disconnect();

    if (response.toString().contains("Por favor, verifique seu e-mail e sua senha.")) {
        System.out.println("Incorrect email or password!");
        return 0;
    } else if (response.toString().contains("nforme um endereço de email válido")) {
        System.out.println("Email syntax invalid!");
        return 0;
    } else {
        System.out.println("You're in!");
        return 1;
    }
}

感谢任何帮助，谢谢。