HttpURLConnection with JSON on Android 9， API 28

Question

我正在尝试在Android 9，API 28中使用HttpURLConnection。它适用于Android 8.0.0，API 26，但不适用于API 28。

            JSONObject jsonObject = new JSONObject();

            jsonObject.accumulate("name", name);

            String json = jsonObject.toString();

            URL url = new URL("http://website_link");

            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

            urlConnection.setDoOutput(true);

            urlConnection.setRequestMethod("POST");

            urlConnection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");

            OutputStream os = urlConnection.getOutputStream();

            os.write(json.getBytes("UTF-8"));

            os.close();

            InputStream inputStream = new BufferedInputStream(urlConnection.getInputStream());

            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("utf-8")), 8);

            String line;

            json = "";

            while ((line = reader.readLine()) != null) {

                json += line;

            }

            inputStream.close();

            jsonObject = new JSONObject(json);

            inputStream.close();

            urlConnection.disconnect();

            ...

我试图使用以查看哪些代码未执行，我看到它停止在Log.dOutputStream os = urlConnection.getOutputStream();

你知道问题出在哪里吗？

Answer 1

试试这个添加Manifest.xmlcleartextTrafficPermitted="true"它看起来像这样 如何允许在Android（9）Pie中的所有网络连接类型HTTP和HTTPS？

Answer 2

这是因为Apache HTTP客户端的折旧，所以在标签中添加下面一行。<uses-library&nbsp;android:name="org.apache.http.legacy"&nbsp;android:required="false"/>