Android 9 上 JSON 的 HttpURLConnection，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();

            ...

我尝试使用 Log.d 来查看未执行的代码，我看到它停止在 OutputStream os = urlConnection.getOutputStream();

你知道问题出在哪里吗？

Answer 1

试试这个添加 Manifest.xml

cleartextTrafficPermitted="true"

看起来像这样

Answer 2

这是因为 Apache HTTP 客户端折旧，所以添加以下行标签。

<uses-library android:name="org.apache.http.legacy" android:required="false"/>

Android 9 上 JSON 的 HttpURLConnection，API 28

HttpURLConnection with JSON on Android 9, API 28

java

android

json

httpurlconnection