json通過HttpURLConnection發佈

Question

我想發送json。但我有一個錯誤如下：com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:203)

@覆蓋

 protected String doInBackground(String... arg0) { 
      try { 
       URL url = new URL(AppConstant.SEND_ANSWER + _survey_id + "/answers/"); 
       System.out.println("SEND URL " + url); 
       HttpURLConnection connection = (HttpURLConnection) url.openConnection(); 
       connection.setRequestMethod("POST"); 
       connection.setDoInput(true); 
       connection.setDoOutput (true); 
       connection.setUseCaches (false); 
       connection.setRequestProperty("Auth-Token", _token = mSettings.getString("token", "")); 
       connection.setRequestProperty("Content-Type","application/json"); 
       connection.connect(); 
       int status = connection.getResponseCode(); 

       JSONObject params = new JSONObject(); 
       JSONArray jsonArray = new JSONArray(); 
       JSONObject studentsObj = new JSONObject(); 

       int listSize = _q_list.size(); 
       for (int i = 0; i<listSize; i++) { 
         question = question_list.get(i).id; 
         params.put("question", question); 
         params.put("answer", "true"); 
         jsonArray.put(params); 
         studentsObj.put("id", _page_id); 
         studentsObj.put("answers", jsonArray); 

         String jsonStr = studentsObj.toString(); 
         System.out.println("jsonString: "+ jsonStr); 
         OutputStreamWriter wr = new OutputStreamWriter(connection.getOutputStream()); 
         wr.write(studentsObj.toString()); 
         wr.flush(); 
         wr.close(); 
       }  
       BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8")); 
        String line = null; 
        String response = ""; 
        while ((line = rd.readLine()) != null) { 
         response += line; 
        } 
       System.out.println("Params " + params); 
       System.out.println("Connection " + status); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      }    
      return null; 

     } 

但是我有一個錯誤：com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:203)

Answer 1

嘗試這個通網址和JSON對象的字符串。

HttpClient httpclient = new DefaultHttpClient(); 
      HttpParams myParams = new BasicHttpParams(); 
      HttpConnectionParams.setConnectionTimeout(myParams, 20000); 
      HttpConnectionParams.setSoTimeout(myParams, 20000); 

      String json_o = paramenter; 
      HttpPost httppost = new HttpPost(URL); 

      // set header 
      httppost.setHeader("Content-type", "application/json"); 

      try { 
       StringEntity se = new StringEntity(json_o); 
       se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, 
         "application/json")); 

       httppost.setEntity(se); 

       HttpResponse response = httpclient.execute(httppost); 

       temp = EntityUtils.toString(response.getEntity()); 
}catch (IOException e) { 
      e.printStackTrace(); 
     }