以下是从URL获取JSON响应的代码。我使用AsyncTask下载响应。从logcat输出中，错误显示在readFromStream方法中。
private class MovieAsyncTask extends AsyncTask<String, Void, List<Movie>>{
@Override
protected List<Movie> doInBackground(String... urls) {
URL url = createUrl(urls[0]);
String jsonresponse = "";
try{
jsonresponse = makeHttpRequest(url);
}
catch (IOException e){
}
List<Movie> movieList = extractMovieFromJson(jsonresponse);
return movieList;
}
@Override
protected void onPostExecute(List<Movie> movieList) {
MovieAdapter adapter = new MovieAdapter(movieList);
recyclerView.setAdapter(adapter);
}
private URL createUrl(String stringUrl) {
URL url = null;
try {
url = new URL(stringUrl);
} catch (MalformedURLException e) {
return null;
}
return url;
}
private String makeHttpRequest(URL url) throws IOException{
String jsonresponse = null;
HttpURLConnection urlConnection = null;
InputStream inputStream = null;
try {
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setReadTimeout(10000);
urlConnection.setConnectTimeout(15000);
urlConnection.connect();
inputStream = urlConnection.getInputStream();
jsonresponse = readFromStream(inputStream);
}
catch (IOException e){
}
finally {
if(urlConnection != null)
urlConnection.disconnect();
if (inputStream != null)
inputStream.close();
}
return jsonresponse;
}
private String readFromStream(InputStream inputStream) throws IOException {
StringBuilder output = new StringBuilder();
if(inputStream != null){
InputStreamReader inputStreamReader = new InputStreamReader(inputStream , Charset.forName("UTF-8"));
BufferedReader reader = new BufferedReader(inputStreamReader);
String line = reader.readLine();
while (line != null){
output.append(line);
reader.readLine();
}
}
Log.v("response",output.toString());
return output.toString();
}
private List<Movie> extractMovieFromJson(String movieJson){
List<Movie> movieList = new ArrayList<>();
if (TextUtils.isEmpty(movieJson))
return null;
try{
JSONObject basejsonresponse = new JSONObject(movieJson);
JSONObject data = basejsonresponse.getJSONObject("data");
JSONArray movieArray = data.getJSONArray("movies");
for (int i = 0; i < movieArray.length(); i++) {
JSONObject movie = movieArray.getJSONObject(i);
String movieName = movie.getString("title_long");
String movieUrl = movie.getString("url");
String movieImg = movie.getString("background_image_original");
movieList.add(new Movie(movieName,movieUrl,movieImg));
}
return movieList;
}
catch (JSONException e){
}
return null;
}
}
}
JSON响应不是太大。
以下是JSON响应。
{
"status":"ok",
"status_message":"Query was successful",
"data":{
"movie_count":6727,
"limit":1,
"page_number":1,
"movies":[
{
"id":7078,
"url":"https:\/\/yts.am\/movie\/battlecreek-2017",
"imdb_code":"tt1880415",
"title":"Battlecreek",
"title_english":"Battlecreek",
"title_long":"Battlecreek (2017)",
"slug":"battlecreek-2017",
"year":2017,
"rating":6.5,
"runtime":97,
"genres":[
"Drama",
"Romance"
],
"summary":"Henry is a loner, living with his overprotective mother in a small Southern town called Battlecreek. Henry has a rare sun disease and must avoid sunlight. He lives his life at night -- hanging out at the diner, working the night shift at the gas station and swimming in the creek under the moonlight. Henry doesn't know who he is or what he wants, until he meets Alison. When Alison's car breaks down in Battlecreek, she answers the \"help wanted\" sign at the diner to pay for the repair. Henry is immediately drawn to the mysterious girl. Alison shows Henry that he can live a life he thought impossible, even at the cost of losing his mom and freeing him from his past.",
"description_full":"Henry is a loner, living with his overprotective mother in a small Southern town called Battlecreek. Henry has a rare sun disease and must avoid sunlight. He lives his life at night -- hanging out at the diner, working the night shift at the gas station and swimming in the creek under the moonlight. Henry doesn't know who he is or what he wants, until he meets Alison. When Alison's car breaks down in Battlecreek, she answers the \"help wanted\" sign at the diner to pay for the repair. Henry is immediately drawn to the mysterious girl. Alison shows Henry that he can live a life he thought impossible, even at the cost of losing his mom and freeing him from his past.",
"synopsis":"Henry is a loner, living with his overprotective mother in a small Southern town called Battlecreek. Henry has a rare sun disease and must avoid sunlight. He lives his life at night -- hanging out at the diner, working the night shift at the gas station and swimming in the creek under the moonlight. Henry doesn't know who he is or what he wants, until he meets Alison. When Alison's car breaks down in Battlecreek, she answers the \"help wanted\" sign at the diner to pay for the repair. Henry is immediately drawn to the mysterious girl. Alison shows Henry that he can live a life he thought impossible, even at the cost of losing his mom and freeing him from his past.",
"yt_trailer_code":"rMSP6i7KrHE",
"language":"English",
"mpa_rating":"R",
"background_image":"https:\/\/yts.am\/assets\/images\/movies\/battlecreek_2017\/background.jpg",
"background_image_original":"https:\/\/yts.am\/assets\/images\/movies\/battlecreek_2017\/background.jpg",
"small_cover_image":"https:\/\/yts.am\/assets\/images\/movies\/battlecreek_2017\/small-cover.jpg",
"medium_cover_image":"https:\/\/yts.am\/assets\/images\/movies\/battlecreek_2017\/medium-cover.jpg",
"large_cover_image":"https:\/\/yts.am\/assets\/images\/movies\/battlecreek_2017\/large-cover.jpg",
"state":"ok",
"torrents":[
{
"url":"https:\/\/yts.am\/torrent\/download\/72CEC05285BF162BCD6AFD4566A6DF81DA7AA39F",
"hash":"72CEC05285BF162BCD6AFD4566A6DF81DA7AA39F",
"quality":"720p",
"seeds":0,
"peers":0,
"size":"727.84 MB",
"size_bytes":763195556,
"date_uploaded":"2018-02-11 18:10:39",
"date_uploaded_unix":1518390639
},
{
"url":"https:\/\/yts.am\/torrent\/download\/AD72D4BF14B9D4DDC8EC446016C6010473CED78B",
"hash":"AD72D4BF14B9D4DDC8EC446016C6010473CED78B",
"quality":"1080p",
"seeds":0,
"peers":0,
"size":"1.51 GB",
"size_bytes":1621350154,
"date_uploaded":"2018-02-11 20:29:05",
"date_uploaded_unix":1518398945
}
],
"date_uploaded":"2018-02-11 18:10:39",
"date_uploaded_unix":1518390639
}
]
},
"@meta":{
"server_time":1518444748,
"server_timezone":"EST5EDT",
"api_version":2,
"execution_time":"0 ms"
}
}
我不明白为什么会这样。我看过一些提到使用GSON的帖子。但我认为这不是一个大的回应。请帮帮我。
答案 0 :(得分：1)
你有无限循环，因为你永远不会更新你的行变量。试试这个：
while (line != null) {
output.append(line);
line = reader.readLine();
}