java.lang.RuntimeException：执行doInBackground时发生错误（
处理：com.example.dell.api，PID：22968 java.lang.RuntimeException：在java.util.concurrent处的android.os.AsyncTask $ 3.done（AsyncTask.java:304）处执行doInBackground（）时发生错误。 FutureTask.finishCompletion（FutureTask.java:355）at java.util.concurrent.FutureTask.setException（FutureTask.java:222）at java.util.concurrent.FutureTask.run（FutureTask.java:242）at android.os.AsyncTask $ java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112）上的$ SerialExecutor $ 1.run（AsyncTask.java:231）at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:587）at java .lang.Thread.run（Thread.java:818）导致：java.lang.SecurityException：在java.net上的java.net.InetAddress.lookupHostByName（InetAddress.java:451）处的权限被拒绝（缺少INTERNET权限？）。 InetAddress.getAllByNameImpl（InetAddress.java:252）at java.net.InetAddress.getAllByName（InetAddress.java:215）at com.android.okhttp.HostResolver $ 1.getAllByName（HostResolver.java:29）at com.an droid.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress（RouteSelector.java:232）at com.android.okhttp.internal.http.RouteSelector.next（RouteSelector.java:124）at com.android.okhttp.internal.http。 HttpEngine.connect（HttpEngine.java:370）at com.android.okhttp.internal.http.HttpEngine.sendRequest（HttpEngine.java:298）at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute（HttpURLConnectionImpl.java： 399）at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect（HttpURLConnectionImpl.java:110）at com.android.okhttp.internal.http.DelegatingHttpsURLConnection.connect（DelegatingHttpsURLConnection.java:89）at com.android.okhttp .internal.http.HttpsURLConnectionImpl.connect（HttpsURLConnectionImpl.java:25）at com.example.dell.api.MainActivity $ JSONTask.doInBackground（MainActivity.java:147）at com.example.dell.api.MainActivity $ JSONTask.doInBackground （MainActivity.java:131）at android.os.AsyncTask $ 2.call（AsyncTask.java:292）at java.util.concurrent.FutureTask.run（FutureTas 在java.util.concurrent.ThreadPoolExecutor上的java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112）$ android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231） Worker.run（ThreadPoolExecutor.java:587）在java.lang.Thread.run（Thread.java:818）
这是我的代码：
protected List<MovieModel> doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
String finalJson = buffer.toString();
JSONObject parentObject = new JSONObject(finalJson);
JSONArray parentArray = parentObject.getJSONArray("movies");
List<MovieModel> movieModelList = new ArrayList<>();
Gson gson = new Gson();
for (int i = 0; i < parentArray.length(); i++) {
JSONObject finalObject = parentArray.getJSONObject(i);
/**
* below single line of code from Gson saves you from writing the json parsing yourself
* which is commented below
*/
MovieModel movieModel = gson.fromJson(finalObject.toString(), MovieModel.class); // a single line json parsing using Gson
movieModel.setMovie(finalObject.getString("movie"));
movieModel.setYear(finalObject.getInt("year"));
movieModel.setRating((float) finalObject.getDouble("rating"));
movieModel.setDirector(finalObject.getString("director"));
movieModel.setDuration(finalObject.getString("duration"));
movieModel.setTagline(finalObject.getString("tagline"));
movieModel.setImage(finalObject.getString("image"));
movieModel.setStory(finalObject.getString("story"));
List<MovieModel.Cast> castList = new ArrayList<>();
for (int j = 0; j < finalObject.getJSONArray("cast").length(); j++) {
MovieModel.Cast cast = new MovieModel.Cast();
cast.setName(finalObject.getJSONArray("cast").getJSONObject(j).getString("name"));
castList.add(cast);
}
movieModel.setCastList(castList);
// adding the final object in the list
movieModelList.add(movieModel);
}
return movieModelList;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
enter code here
你忘了在你的清单中添加INTERNET权限
<uses-permission android:name="android.permission.INTERNET" />
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