使用java登录亚马逊卖家中心网站

Question

我想使用java登录亚马逊卖家中心并获取已经为卖家提交的所有反馈。我遵循http://www.mkyong.com/java/how-to-automate-login-a-website-java-example/中提到的方法，但没有成功。

以下是我正在使用的代码。请让我知道我在做什么错：

public class TestStringSplit {
    private List<String> cookies;
    private HttpsURLConnection conn;

    private final String USER_AGENT = "Mozilla/5.0";

    public static void main(String[] args) throws Exception {

        String url = "https://sellercentral.amazon.in/gp/feedback-manager/view-all-feedback.html";
        TestStringSplit http = new TestStringSplit();

        // make sure cookies is turn on
        CookieHandler.setDefault(new CookieManager());

        // 1. Send a "GET" request, so that you can extract the form's data.
        HashMap<String, String> hm = http.GetPageContent(url);
        url = hm.keySet().iterator().next();
        String page = hm.get(url);

        String postParams = http.getFormParams(page, "xxx@gmail.com", "abcdef@123");

        // 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(targetURL)).entrySet().iterator().next().getValue();
        // System.out.println(result);
    }

    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", "sellercentral.amazon.in");
        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", "en-US,en;q=0.5");
        for (String cookie : this.cookies) {
            conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
        }
        conn.setRequestProperty("Connection", "keep-alive");
        // conn.setRequestProperty("Referer",
        // "https://accounts.google.com/ServiceLoginAuth");
        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 HashMap<String, 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", "en-US,en;q=0.5");
        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"));

        System.out.println("redirected url: " + conn.getURL());
        HashMap<String, String> hm = new HashMap<>();
        hm.put(conn.getURL().toString(), response.toString());

        return hm;

    }

    public String getFormParams(String html, String username, String password) throws UnsupportedEncodingException {

        System.out.println("Extracting form's data...");

        Document doc = Jsoup.parse(html);

        // Google form id
        Element loginform = doc.getElementById("ap_signin_form");
        Elements inputElements = loginform.getElementsByTag("input");
        List<String> paramList = new ArrayList<String>();
        for (Element inputElement : inputElements) {
            String key = inputElement.attr("name");
            String value = inputElement.attr("value");

            if (key.equalsIgnoreCase("Email"))
                value = username;
            else if (key.equalsIgnoreCase("Password"))
                value = password;
            paramList.add(key + "=" + URLEncoder.encode(value, "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;
    }

}