URLConnection - 在读取响应后无法写入请求体

时间:2016-05-17 04:22:04

标签: android protocolexception

我有一系列对象,我试图通过它发布到API。第一个对象将按照它应该完成,然后我得到:

java.net.ProtocolException: cannot write request body after response has been read

我相当肯定这只是我做事的顺序,但我仍然在学习Android,并且一直试图找出一小时和一点点现在

我想转向你们寻求帮助!我需要收到POST的每个响应,所以我可以将它复制到ID字段以便稍后使用。您将看到我在FOR循环中解析它,然后将ID存储在一个列表中,我将在稍后循环。

以下POST的代码:

try {
            url = new URL("##Edited Out##");
            conn = (HttpsURLConnection) url.openConnection();

            // Create the SSL connection
            sc = SSLContext.getInstance("TLS");
            sc.init(null, null, new SecureRandom());
            conn.setSSLSocketFactory(sc.getSocketFactory());

            // Use this if you need SSL authentication
            String userpass = "##Edited Out##:##Edited Out##";
            String basicAuth = "Basic " + Base64.encodeToString(userpass.getBytes(), Base64.DEFAULT);
            conn.setRequestProperty("Authorization", basicAuth);
            conn.setRequestProperty("Content-Type", "application/json;odata=verbose");

            // set Timeout and method
            conn.setReadTimeout(7000);
            conn.setConnectTimeout(7000);
            conn.setRequestMethod("POST");
            conn.setDoInput(true);
            conn.setDoOutput(true);

            conn.connect();

            JSONObject juo = new JSONObject();

            for (int i = 0; i<objects.size(); i++){

                juo.put("Field1", "Data for field 1 here");
                juo.put("Field2", "Data for field 2 here");
                juo.put("Field3", "Data for field 3 here");

                wr = new OutputStreamWriter(conn.getOutputStream());
                wr.write(juo.toString());
                wr.flush();
                wr.close();

                Log.d("ITEM STRING", juo.toString());

                BufferedReader br = new BufferedReader(new InputStreamReader(
                        conn.getInputStream(), "utf-8"));
                while ((line = br.readLine()) != null) {
                    sb.append(line + "\n");
                }
                br.close();

                Log.d("HTTP BR", "" + sb.toString());

                jObject = XML.toJSONObject(sb.toString());

                Log.d("JSON OBJECT", jObject.toString());

                JSONObject menuObject = jObject.getJSONObject("entry");
                JSONObject contentObject = menuObject.getJSONObject("content");
                JSONObject propertiesObject = contentObject.getJSONObject("m:properties");
                JSONObject productObject = propertiesObject.getJSONObject("d:Product_Id");
                String retProId = productObject.getString("content");

                partIDs.add(retProId);

                Log.d("PART ID", retProId);
            }

            int HttpResult = conn.getResponseCode();
            Log.d("HTTP RESULT", String.valueOf(HttpResult));
            Log.d("HTTP RESPONSE", conn.getResponseMessage());

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyManagementException e) {
            e.printStackTrace();
        } catch (ProtocolException e) {
            e.printStackTrace();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;

编辑:关于下面的重复评论 我收到的错误略有不同。我理解它的原理,但我的.getRespondeCode不在我的for循环中,它应该循环通过。但它不是。

如果objects.size&gt; = 2

,则会发生此错误

我需要获取POST的每个对象的服务器响应字符串,因为它包含我需要解析的ID。

1 个答案:

答案 0 :(得分:2)

HTTP协议基于请求 - 响应模式:您首先发送请求,服务器响应。一旦服务器响应,您就无法发送更多内容,这是没有意义的。

查看您的代码,您将获得for循环中的响应。当访问一个响应然后下一次循环抛出异常。如果要创建多个请求,则每次都应创建新的urlconnection。例如。

 private void requestMethod(){
       //your for loop goes here

    }

    private void backgroundOperation(/**required parameter*/){
      // your httpurlconnection code goes here don't use for loop. use finally   block to close connection also
    }