登录不起作用

Question

我正在尝试创建一个登录应用程序，以便您可以查看成绩/电子邮件教师/等。 我可以做所有的事情，但我无法登录为我的生活工作。 每次我尝试，我得到：

Could not retrieve user_id from the session. User timed out. Blockquote

我不知道这有什么错我的代码，为什么我不能登录。 有人请帮助我。谢谢。

代码的主要 “登陆” 的：

“MYSOUP” 的

public class GradePortalActivity extends Activity { 
    private final static String SITE = "http://dcps.mygradeportal.com/"; 
    private TextView usernameField, passwordField; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     MySoup.setSite(SITE); 
     usernameField = (TextView) this.findViewById(R.id.usernameField); 
     passwordField = (TextView) this.findViewById(R.id.passwordField); 
    } 

    public void login(View v) { 
     if (usernameField.length() > 0 && passwordField.length() > 0) 
      new Login().execute(new String[] { usernameField.getText().toString().trim(), passwordField.getText().toString() }); 
     else { 
      Toast.makeText(this, "Fill out login form", Toast.LENGTH_LONG).show(); 
     } 
    } 

    private class Login extends AsyncTask<String, Void, Boolean> { 
     private ProgressDialog dialog; 

     @Override 
     protected void onPreExecute() { 
      lockScreenRotation(); 
      dialog = new ProgressDialog(GradePortalActivity.this); 
      dialog.setIndeterminate(true); 
      dialog.setMessage("Logging in..."); 
      dialog.show(); 
     } 

     @Override 
     protected Boolean doInBackground(String... params) { 
      String username = params[0]; 
      String password = params[1]; 
      try { 
       MySoup.login(username, password); 
       return true; 
      } catch (Exception e) { 
       e.printStackTrace(); 
       return false; 
      } 
     } 

     @Override 
     protected void onPostExecute(Boolean status) { 
      dialog.dismiss(); 
      if (status == true) { 
       Toast.makeText(GradePortalActivity.this, "Logged in", Toast.LENGTH_LONG).show(); 
       new Test().execute(); 
      } 
      if (status == false) { 
       Toast.makeText(GradePortalActivity.this, "Log in failed", Toast.LENGTH_LONG).show(); 
      } 
     } 
    } 

    private class Test extends AsyncTask<String, Void, String> { 
     private ProgressDialog dialog; 

     @Override 
     protected String doInBackground(String... params) { 
      String s = MySoup.inputStreamToString(MySoup.scrape("http://dcps.mygradeportal.com/homepage.aspx")); 
      return s; 
     } 

     @Override 
     protected void onPostExecute(String s) { 
      Toast.makeText(GradePortalActivity.this, s, Toast.LENGTH_LONG).show(); 
     } 
    } 

    private void lockScreenRotation() { 
     switch (this.getResources().getConfiguration().orientation) { 
     case Configuration.ORIENTATION_PORTRAIT: 
      this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 
      break; 
     case Configuration.ORIENTATION_LANDSCAPE: 
      this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 
      break; 
     } 
    } 

    private void unlockScreenRotation() { 
     this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED); 
    } 
} 

代码（应用程序的骨干）：

public class MySoup { 

    /** The http client. */ 
    private static DefaultHttpClient httpClient = getHttpClient(); 

    /** The cookies. */ 
    private static List<Cookie> cookies; 

    /** The http params. */ 
    private static HttpParams httpParams = httpClient.getParams(); 

    /** The username. */ 
    private static String username; 

    /** The SITE. */ 
    private static String SITE; 

    /** The httpget. */ 
    private static HttpGet httpget; 

    /** The response. */ 
    private static HttpResponse response; 

    /** The entity. */ 
    private static HttpEntity entity; 

    /** The httpost. */ 
    private static HttpPost httpost; 

    public static void setSite(String s) { 
     if (!s.endsWith("/")) { 
      s = s + "/"; 
     } 
     if (!s.startsWith("http://") || s.startsWith("https://")) { 
      s = "http://" + s; 
     } 
     SITE = s; 
    } 

    /** 
    * Gets the site. 
    * 
    * @return the site 
    */ 
    public static String getSite() { 
     return SITE; 

    } 

    /** 
    * Gets the http client. 
    * 
    * @return the http client 
    */ 
    private static DefaultHttpClient getHttpClient() { 
     DefaultHttpClient client = new DefaultHttpClient(); 
     ClientConnectionManager mgr = client.getConnectionManager(); 
     HttpParams params = client.getParams(); 



     client = new DefaultHttpClient(new ThreadSafeClientConnManager(params, mgr.getSchemeRegistry()), params); 
     return client; 
    } 

    /** 
    * Gets the session id. 
    * 
    * @return the session id 
    */ 
    public static String getSessionId() { 
     return cookies.get(0).getValue(); 
    } 

    /** 
    * Gets the cookies. 
    * 
    * @return the cookies 
    */ 
    public static List<Cookie> getCookies() { 
     return cookies; 
    } 

    /** 
    * Checks if is logged in. 
    * 
    * @return true, if is logged in 
    */ 
    public static boolean isLoggedIn() { 
     if ((cookies != null) && !cookies.isEmpty()) 
      return true; 
     else 
      return false; 
    } 

    /** 
    * Login. 
    * 
    * @param url 
    *   the url 
    * @param username 
    *   the username 
    * @param password 
    *   the password 
    * @throws CouldNotLoadException 
    *    the could not load exception 
    */ 
    public static void login(String username, String password) throws Exception { 
     String url = SITE; 

     try { 
      httpget = new HttpGet(url); 
      response = httpClient.execute(httpget); 
      entity = response.getEntity(); 

      httpost = new HttpPost(url); 
      List<NameValuePair> nvps = new ArrayList<NameValuePair>(); 
      nvps.add(new BasicNameValuePair("userName", username)); 
      nvps.add(new BasicNameValuePair("password", password)); 

      httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8)); 

      response = httpClient.execute(httpost); 
      entity = response.getEntity(); 
      if (entity != null) { 
      entity.consumeContent(); 
      cookies = httpClient.getCookieStore().getCookies(); 
      }} catch (Exception e) { 
      e.printStackTrace(); 
      throw new Exception("Could not login"); 
      } 

      } 



    /** 
    * Scrape. 
    * 
    * @param url 
    *   the url 
    * @return the input stream 
    */ 
    public static InputStream scrape(String url) { 
     httpget = new HttpGet(url); 
     response = null; 
     try { 
      response = httpClient.execute(httpget); 
      entity = response.getEntity(); 
      InputStream s = entity.getContent(); 
      System.err.println("encoding " + entity.getContentEncoding()); 
      return s; 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return null; 

    } 

    /** 
    * Input stream to string. 
    * 
    * @param is 
    *   the is 
    * @return the string 
    */ 
    public static String inputStreamToString(InputStream is) { 
     String line = ""; 
     StringBuilder total = new StringBuilder(); 

     BufferedReader rd = new BufferedReader(new InputStreamReader(is)); 
     // Read response until the end 
     try { 
      while ((line = rd.readLine()) != null) { 
       total.append(line); 
      } 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     return total.toString(); 
    } 

    /** 
    * Press link. 
    * 
    * @param url 
    *   the url 
    */ 
    public static void pressLink(String url) { 
     url = SITE + url; 
     httpget = new HttpGet(url); 
     response = null; 
     try { 
      response = httpClient.execute(httpget); 
      response.getEntity().consumeContent(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    /** 
    * Gets the username. 
    * 
    * @return the username 
    */ 
    public static String getUsername() { 
     return username; 
    } 

    /** 
    * Sets the session id. 
    * 
    * @param sessionId 
    *   the new session id 
    */ 
    public static void setSessionId(String sessionId) { 
     Cookie cookie = new BasicClientCookie("", sessionId); 
     CookieStore cs = new BasicCookieStore(); 
     cs.addCookie(cookie); 
     httpClient.setCookieStore(cs); 
     cookies = httpClient.getCookieStore().getCookies(); 
    } 

} 

Answer 1

的 “错误”：

正在生成此线路：

String s = MySoup.inputStreamToString(MySoup.scrape("http://dcps.mygradeportal.com/homepage.aspx")); 

如果你浏览到http://dcps.mygradeportal.com/homepage.aspx，你会看到你的服务器产生以下错误：

Server Error in '/' Application.

Could not retrieve user_id from the session. User timed out

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: OnCourse.Core.SWSException: Could not retrieve user_id from the session. User timed out

etc...

所以我嫌疑的情况是，你应该在几个POST传递参数刮http://dcps.mygradeportal.com/homepage.aspx，你没有做。其中一个参数可能是难以捉摸的user_id。

请记住，我无法确切地告诉您，因为我不知道gradeportal服务如何工作，但这应该可以帮助您解决问题。