android：fields中的登錄問題返回空

Question

我目前正在爲我們的論文創建和android應用程序。當我開始遇到登錄問題時，我已經完成了應用程序。當我嘗試敬酒時，這些字段會接受輸入，但當我將數據發送到服務器時，會向我發送「字段爲空」響應。我在這方面遇到困難，所以任何幫助都會得到真正的讚賞。

這是我JSONParser類：

public class JSONParser { 

    static InputStream is = null; 
    static JSONObject jObj = null; 
    static String json = ""; 

    // constructor 
    public JSONParser() { 

    } 

    // function get json from url 
    // by making HTTP POST or GET mehtod 
    public JSONObject makeHttpRequest(String url, String method, 
     List<NameValuePair> params) { 

     // Making HTTP request 
     try { 

      // check for request method 
      if(method.equals("POST"){ 
       // request method is POST 
       // defaultHttpClient 
       DefaultHttpClient httpClient = new DefaultHttpClient(); 
       HttpPost httpPost = new HttpPost(url); 
       httpPost.setEntity(new UrlEncodedFormEntity(params)); 

       HttpResponse httpResponse = httpClient.execute(httpPost); 
       HttpEntity httpEntity = httpResponse.getEntity(); 
       is = httpEntity.getContent(); 

      } else if (method.equals("GET") { 
       // request method is GET 
       DefaultHttpClient httpClient = new DefaultHttpClient(); 
       String paramString = URLEncodedUtils.format(params, "utf-8"); 
       url += "?" + paramString; 
       HttpGet httpGet = new HttpGet(url); 

       HttpResponse httpResponse = httpClient.execute(httpGet); 
       HttpEntity httpEntity = httpResponse.getEntity(); 
       is = httpEntity.getContent(); 
      }   

     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     try { 
      BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8); 
      StringBuilder sb = new StringBuilder(); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      is.close(); 
      json = sb.toString(); 
     } catch (Exception e) { 
      Log.e("Buffer Error", "Error converting result " + e.toString()); 
     } 

     // try parse the string to a JSON object 
     try { 
      jObj = new JSONObject(json); 
     } catch (JSONException e) { 
      Log.e("JSON Parser", "Error parsing data " + e.toString()); 
     } 

     // return JSON String 
     return jObj; 
    } 
} 

這是我登錄的AsyncTask：

class AttemptLogin extends AsyncTask<String, String, String> { 

    /** 
    * Before starting background thread Show Progress Dialog 
    * */ 
    boolean failure = false; 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     pDialog = new ProgressDialog(Login.this); 
     pDialog.setMessage("Attempting login..."); 
     pDialog.setIndeterminate(false); 
     pDialog.setCancelable(true); 
     pDialog.show(); 
    } 

    @Override 
    protected String doInBackground(String... args) { 

     int success; 
     String emailaddress = EADD.getText().toString(); 
     String password = PASS.getText().toString(); 

     List<NameValuePair> params = new ArrayList<NameValuePair>(); 
     params.add(new BasicNameValuePair("mem_email", emailaddress)); 
     params.add(new BasicNameValuePair("mem_password", password)); 

     Log.d("request!", "starting"); 

     JSONObject json = jsonParser.makeHttpRequest("http://builtcycles.com/built_mobile/login.php", "POST", params); 

     // check your log for json response 
     Log.d("Login attempt", json.toString()); 
     // json success tag 
     try{ 
      success = json.getInt("success"); 

      if (success == 1) { 
       String memberId = json.getString("id"); 
       String memberName = json.getString("uid"); 

       Log.d("Login Successful!", json.toString()); 
       pDialog.dismiss(); 

       intent = new Intent(Login.this, MainActivity.class); 

       intent.putExtra("id", memberId); 
       intent.putExtra("uid", memberName); 

       startActivity(intent); 
       finish(); 

       return json.getString("message");  
      } else { 
       Log.d("Login Failure!", json.getString("message")); 
       return json.getString("message"); 
      } 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 

     return null; 
    } 

    /** 
    * After completing background task Dismiss the progress dialog 
    * **/ 

    @Override 
    protected void onPostExecute(String file_url) { 

     pDialog.dismiss(); 

     if (file_url != null) { 
      Toast.makeText(Login.this, file_url, Toast.LENGTH_SHORT).show(); 
     } 
    } 
} 

這是我的登錄PHP：

<?php 
    $response = array(); 
    if (!empty($_POST)) { 

     $email= $_POST['mem_email']; 

     // include db connect class 
     require_once __DIR__ . '/db_connect.php'; 

     // connecting to db 
     $db = new DB_CONNECT(); 

     // mysql inserting a new row 
     $result = mysql_query("SELECT * from tblmembers where mem_email='$email'"); 

     if (mysql_num_rows($result) > 0) { 
      while ($row = mysql_fetch_array($result)) { 
       $response["id"] = $row["mem_id"]; 
       $response["uid"] = $row["mem_fname"]; 

       if ($row["mem_active"]==1) { 
        if (md5($_POST['mem_password'])===$row['mem_password']) { 

         $response["success"] = 1; 
         $response["message"] = "Login successfully!"; 

         echo json_encode($response); 
        } else { 

         $response["success"] = 0; 
         $response["message"] = "Invalid email or password"; 

         echo json_encode($response);        
        } 
       } else { 
        $response["success"] = 3; 
        $response["message"] = "Check your email for verification! Thanks."; 

        echo json_encode($response); 
       } 
      } 
     } else { 
      // no products found 
      $response["success"] = 4; 
      $response["message"] = "No user found"; 

      // echo no users JSON 
      echo json_encode($response); 
     } 
    } else { 
     $response["success"] = 4; 
     $response["message"] = "Fields are empty."; 

     // echo no users JSON 
     echo json_encode($response); 
    } 
?> 

我已將方法==「POST」/「GET」更改爲method.equals（「POST」）。但是，我無法將數據發送到服務器。問題來自jsonparser類，還是來自於asynctask的doinbackground（）？

Answer 1

變化

makeHttpRequest() 

字符串比較語句從

// check for request method 
if(method == "POST"){ 
    ... 
} else if (method == "GET") { 

到

// check for request method 
if(method.equals("POST")){ 
    ... 
} else if (method.equals("GET")) {