DefaultHttpClient 更改响应大小？

Question

我尝试做什么

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大家好，我正在尝试创建一个应用程序，在其中我可以查看客户给我的订单。为此，我在服务器上创建了一个接口，我可以在该接口上发送 post/get/set 请求。服务器的响应采用 JSON 格式。 （对于您的信息，atm 仅填写了虚拟数据）

现在，当我从我的应用程序向服务器发出 get 请求时，我收到了它的响应，但它不完整，大约有一半我应该得到的响应不存在！ :( 但是当我在浏览器中使用 Get-Request 打开 URL 时，我得到了完整的响应。

问题

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就像你看到的那样，这不可能是基于服务器的问题，因为我也尝试过通过'curl' 来执行此获取请求，并且总是得到完整的响应。

在我的应用程序中，我使用 DefaultHttpClient，所以我认为问题可能只是响应有限制，但我没有找到它

。我可以改变这个吗“响应大小”以及为什么我没有得到完整响应的其他问题可能是什么！一些好的代码片段或您能想象到的任何内容都会有帮助！

在这里您会找到执行 Get 的 Methode 的代码！ -Request.

Code

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如果您需要更多代码，只需将其写在注释中即可！

这

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public void getOrders() {
        Log.d("DataHandlerService", "Aufträge werden geladen");
        Thread t = new Thread() {
            public void run() {

                SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
                String userid = settings.getString("userid", "uid");


                Log.d("DataHandlerService", userid);

                // Download-URL
                String URL = "http://api.i-v-o.ch/users/" + userid
                        + "/assignments.json";
                Log.d("Request-URL", URL);

                DefaultHttpClient client = new DefaultHttpClient();
                HttpResponse response;

                try {
                    HttpGet request = new HttpGet();
                    request.setURI(new URI(URL));
                    request.addHeader("Content-Type",
                            "application/x-www-form-urlencoded");
                    response = client.execute(request);


                    int statuscode = response.getStatusLine().getStatusCode();
                    switch (statuscode) {

                    case 200:

                        if (response != null) {

                            StringBuilder sb = new StringBuilder();
                            BufferedReader rd = new BufferedReader(
                                    new InputStreamReader(response.getEntity()
                                            .getContent()));

                            String line;
                            while ((line = rd.readLine()) != null) {
                                sb.append(line + "\n");
                            }
                            String result;
                            result = sb.toString();
                            Log.d("Response", result);
                            JSONReader(result); //here the json will be generated
                        }

                        break;

                    case 500:
                        // Error-Handling
                        break;
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    Log.e("DataHandler", "URLConnection-Error" + e);
                }

            }
        };
        t.start();
    }

是您要求的响应，就像您看到其中一部分不存在一样！

[{"created_at":"2012-01-06T17:10:00Z","end_datetime":"2008-03-25T13:00:00Z","id":2127,"start_datetime":"2008-03-25T13:00:00Z","updated_at":"2012-01-06T17:10:00Z","title":"2127 Foobar","referee_forename":"Peter","referee_surname":"Gertsch","referee_full_name":"Peter Gertsch","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:03Z","end_datetime":"2008-04-04T12:00:00Z","id":2134,"start_datetime":"2008-04-04T12:00:00Z","updated_at":"2012-01-06T17:10:03Z","title":"2134 Foobar","referee_forename":"Daniel","referee_surname":"Brunner","referee_full_name":"Daniel Brunner","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:03Z","end_datetime":"2008-04-07T12:00:00Z","id":2136,"start_datetime":"2008-04-07T12:00:00Z","updated_at":"2012-01-06T17:10:03Z","title":"2136 Foobar","referee_forename":"Andreas","referee_surname":"Lutz","referee_full_name":"Andreas Lutz","category_title":"Installation - SAT","status_title":"Closed - technisches problem"},{"created_at":"2012-01-06T17:10:08Z","end_datetime":"2008-05-22T07:00:00Z","id":2144,"start_datetime":"2008-05-22T07:00:00Z","updated_at":"2012-01-06T17:10:08Z","title":"2144 Foobar","referee_forename":"Pascal","referee_surname":"Pichand","referee_full_name":"Pascal Pichand","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:08Z","end_datetime":"2008-05-15T07:00:00Z","id":2145,"start_datetime":"2008-05-15T07:00:00Z","updated_at":"2012-01-06T17:10:08Z","title":"2145 Foobar","referee_forename":"Hansruedi","referee_surname":"W\u00fcrgler","referee_full_name":"Hansruedi W\u00fcrgler","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:08Z","end_datetime":"2008-05-26T08:00:00Z","id":2146,"start_datetime":"2008-05-26T08:00:00Z","updated_at":"2012-01-06T17:10:08Z","title":"2146 Foobar","referee_forename":"Martina","referee_surname":"Issler","referee_full_name":"Martina Issler","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:08Z","end_datetime":"2008-06-03T14:00:00Z","id":2147,"start_datetime":"2008-06-03T14:00:00Z","updated_at":"2012-01-06T17:10:08Z","title":"2147 Foobar","referee_forename":"Matthias ","referee_surname":"Kuhn","referee_full_name":"Matthias  Kuhn","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:12Z","end_datetime":"2008-07-07T07:00:00Z","id":2157,"start_datetime":"2008-07-07T07:00:00Z","updated_at":"2012-01-06T17:10:12Z","title":"2157 Foobar","referee_forename":"Eberhard","referee_surname":"Polatzek","referee_full_name":"Eberhard Polatzek","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:13Z","end_datetime":"2008-07-11T08:00:00Z","id":2161,"start_datetime":"2008-07-11T08:00:00Z","updated_at":"2012-01-06T17:10:13Z","title":"2161 Foobar","referee_forename":"Magali","referee_surname":"Bohin","referee_full_name":"Magali Bohin","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:14Z","end_datetime":"2008-07-25T08:30:00Z","id":2163,"start_datetime":"2008-07-25T08:30:00Z","updated_at":"2012-01-06T17:10:14Z","title":"2163 Foobar","referee_forename":"(Hotel Centrum Griesalp)","referee_surname":"Haltenegg Betriebs AG","referee_full_name":"(Hotel Centrum Griesalp) Haltenegg Betriebs AG","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:16Z","end_datetime":"2008-08-07T09:00:00Z","id":2170,"start_datetime":"2008-08-07T09:00:00Z","updated_at":"2012-01-06T17:10:16Z","title":"2170 Foobar","referee_forename":".","referee_surname":"SAC Hollandiah\u00fctte","referee_full_name":". SAC Hollandiah\u00fctte","category_title":"Installation - SAT","status_title":"Closed - Erfolgreich"},{"created_at":"2012-01-06T17:10:16Z","end_datetime":"2009-05-07T06:30:00Z","i

Answer 1

啊。是的，问题不在于你的连接或类似的东西。您的服务返回一个数组 - 而不是一个对象 - 因此您应该像这样解析它：

HttpResponse response = ...
if (.. validate status ..) {
    JSONArray array = new JSONArray(HttpEntityUtils.toString(response.getEntity()));
    // Your JSONArray is now ready to play with.
}

并考虑使用 AsyncTask 而不是线程，如下所示：

class AssignmentsTask extends AsyncTask<String, Void, JSONArray> {
    @Override
    protected JSONArray doInBackground(String... params) {
        final String url = "http://api.i-v-o.ch/users/" + params[0]
                + "/assignments.json";
        try {
            HttpResponse response = mClient.execute(new HttpGet(url));
            if (response.getStatusLine().getStatusCode() == 200) {
                return new JSONArray(EntityUtils.toString(response.getEntity()));
            } else {
                Log.w(TAG, "Error receiving assignments for " + params[0] + ", " + response.getStatusLine());
            }
        } catch (ClientProtocolException e) {
            Log.w(TAG, "Proto: Error fetching assignments for " + params[0], e);
        } catch (IOException e) {
            e.printStackTrace();
            Log.w(TAG, "IO: Error reading assignments for " + params[0], e);
        } catch (ParseException e) {
            Log.w(TAG, "Parse: Error parsing assignments for " + params[0], e);
        } catch (JSONException e) {
            Log.w(TAG, "JSON: Error parsing JSON for " + params[0], e);
        }
        return null;
    }

    @Override
    protected void onPostExecute(JSONArray result) {
        // Stuff that handles the resulting JSONObject on
        // the UI-thread goes here (i.e. update View:s)

        // result is null if the operation failed
    }
}

并检索用户“116”的订单：

new AssignmentsTask().execute("116");

Answer 2

响应大小应由您正在联系的 Web 服务器给出。您可以使用 响应大小 ：

httpResponse.getEntity().getContentLength()

另外，可能会发生连接超时，导致客户端无法接收到响应的所有数据。在这种情况下，请尝试使用足够长的超时 确保您获得所有数据。

如果您的 json 太大，那么在移动环境中期望所有数据都出现在单个请求中并不是一个好主意，那么您可能必须设计一个可以为您提供响应块的 Web 服务器，然后您需要第一个块，然后是另一个块，依此类推。

通常，http 协议的部分内容是这回答这个问题。