java - 将 JsonObject 在 POST 中从 android 发送到服务器

Question

这个问题已经有答案了:

How can I fix 'android.os.NetworkOnMainThreadException'? (65 个回答)

已关闭 6 年前。

我想发送这个jsonobject finalObject到此服务器地址 http://www.xxxx.com/app/pruebaurl我正在使用这段代码

     try {

                URL url = new URL("http://www.xxxx.com/app/pruebaurl");

                HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setRequestProperty("Content-Type","application/json");
                httpURLConnection.setRequestProperty("Accept", "application/json");
                httpURLConnection.connect();

                OutputStream outputStream = httpURLConnection.getOutputStream();
                OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream, "UTF-8");
                outputStreamWriter.write(finalObject.toString());
                outputStreamWriter.flush();
                outputStreamWriter.close();

   BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "UTF-8"));

            String line = null;
            StringBuilder sb = new StringBuilder();

            while ((line = bufferedReader.readLine()) != null) {
                sb.append(line);
            }

            bufferedReader.close();
            result = sb.toString();

      }catch (Exception e) {
                e.printStackTrace();
      }

但是当我通过调试运行代码时，我注意到从行跳转时

 httpURLConnection.connect();

到行

OutputStream outputStream = httpURLConnection.getOutputStream();

生成错误并转到异常，它告诉我以下内容

android.os.NetworkOnMainThreadException

我正在处理一个 fragment ，我可以做些什么来修复这个错误。

Answer 1

您需要使用AsyncTask用于执行网络操作。您不能在主线程上执行它。