json在makeHttpRequest調用中爲null

我有一個名爲ConnectionToOracle的java web項目。我有一個名爲Sign_Up_Servlet的servlet。json在makeHttpRequest調用中爲null

所以我有以下代碼：

private static String url_sign_up_execute 
       = "http://10.11.201.84:8084//ConnectionToOracle/Sign_Up_Servlet"; 

private class GetSignUpStatus extends AsyncTask<String, Integer, String> { 


     ProgressDialog pDialog = new ProgressDialog(Sign_Up.this); 

     @Override 
     protected void onPreExecute() { 
      // TODO Auto-generated method stub 
      super.onPreExecute(); 
      pDialog.setMessage("Please wait..."); 
      pDialog.show(); 
     } 

     @Override 
     protected void onPostExecute(String result) { 
      // TODO Auto-generated method stub 
      super.onPostExecute(result); 


      pDialog.dismiss(); 

      if (json == null) { 
       pDialog.dismiss(); 
       Toast.makeText(
         getApplicationContext(), 
         "Unable to Perform Your Request.Server Is Temporarily Unreachable! Please Try Later.", 
         Toast.LENGTH_LONG).show(); 
      } 
      else{ 
       if(pErrorFlag.equals("N")) 
        Toast.makeText(getApplicationContext(),"Sign Up successfully done ", Toast.LENGTH_LONG).show(); 
       else if(pErrorFlag.equals("Y")) 
        Toast.makeText(getApplicationContext(), pErrorMessage, Toast.LENGTH_LONG).show(); 
      } 
     } 

     @Override 
     protected String doInBackground(String... args) { 
      // TODO Auto-generated method stub 

      List<NameValuePair> params = new ArrayList<NameValuePair>(); 
//   params.add(new BasicNameValuePair("pDeviceId",deviceId_str)); 
//   params.add(new BasicNameValuePair("pMobileNo",mobile_no_str)); 
//   params.add(new BasicNameValuePair("pUserId",user_id_str)); 
//   params.add(new BasicNameValuePair("pPassword",password_str)); 
//   params.add(new BasicNameValuePair("pPinCode",pin_code_str)); 

//   params.add(new BasicNameValuePair("pDeviceId","1")); 
//   params.add(new BasicNameValuePair("pMobileNo","1")); 
//   params.add(new BasicNameValuePair("pUserId","1")); 
//   params.add(new BasicNameValuePair("pPassword","1")); 
//   params.add(new BasicNameValuePair("pPinCode","1")); 
//   
      json = jsonParser.makeHttpRequest(url_sign_up_execute, "POST", params); 

      // Log.d("All Login Responese: ", json.toString()); 

      try { 
       if (json != null) { 
        jsonArray = json.getJSONArray(TAG_SIGN_UP); 
        for (int i = 0; i < jsonArray.length(); i++) { 
         JSONObject c = jsonArray.getJSONObject(i); 

         pErrorFlag = c.getString(TAG_ERROR_FLAG); 
         pErrorMessage = c.getString(TAG_ERROR_MESSAGE) ; 

        } 
        // Log.d("error Code", errorCode); 
       } else { 
        Log.d("Server Unreachable", 
        "Unable to Perform Your request.Server Is Unreachable! Please Try Later."); 
       } 
      } catch (JSONException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

      return null; 
     } 
    }

我想提出一個HTTP請求到「http://10.11.201.84:8084//ConnectionToOracle/Sign_Up_Servlet」的網址。但我得到json值爲空。爲什麼？我該如何解決這個錯誤？

來源

2016-05-15 osimer pothe

json在makeHttpRequest調用中爲null

回答

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