So I'm facing some difficulty in trying to, what seems simply, obtain a JSON file from a webpage, and then parse it on Android. I have already built the parser, and tested it in Eclipse (in fact, all of the code works in Eclipse). However, when I run the HttpURLConnection and try to retrieve the JSON data in a string in Android Studio, I end up getting no exceptions and an almost empty string (I think I am getting the 1st, 2nd, 3rd, and last character, but not too sure). I have included parts of the code below, and
URL url = null;
HttpURLConnection urc = null;
try {
url = new URL(query);
urc = (HttpURLConnection) url.openConnection();
InputStream in = new BufferedInputStream(urc.getInputStream());
jsoncontent = readStream(in);
System.out.println(jsoncontent);
} catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
urc.disconnect();
}
The code for readStream() is below
private static String readStream(InputStream is) throws IOException {
StringBuilder sb = new StringBuilder();
BufferedReader r = new BufferedReader(new InputStreamReader(is),1000);
for (String line = r.readLine(); line != null; line =r.readLine()){
sb.append(line);
}
is.close();
return sb.toString();
}
Here is an exact chunk from an assignment I did last semester:
URL u = new URL(url);
HttpURLConnection conn = (HttpURLConnection) u.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "text/html");
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
JSONObject searchResults = new JSONObject(in.readLine());
...
conn.disconnect();
You seem to be missing setRequestMethod("GET") and setRequestProperty("Accept", "text/html") in your code. Hope this helps.
Related
I'm using api to get xml.
but English text is okay to get xml
and also number text is okay
however korean text can't get
this is my code
StringBuffer result = new StringBuffer();
try {
String urlstr = "https://openapi.gg.go.kr/OrganicAnimalProtectionFacilit?" +
"KEY=secret" +
"&Type=xml" +
"&pIndex=1"+
"&pSize=100";
URL url = new URL(urlstr);
HttpURLConnection urlconnection = (HttpURLConnection) url.openConnection();
urlconnection.setRequestMethod("GET");
BufferedReader br = new BufferedReader(new InputStreamReader(urlconnection.getInputStream(), StandardCharsets.UTF_8 ));
String returnLine;
result.append("<xmp>");
while((returnLine = br.readLine())!=null) {
result.append(returnLine+"\n");
}
urlconnection.disconnect();
}catch(Exception e) {
e.printStackTrace();
}
return result+"</xmp>";
I have implemented reCaptcha in the application I am working on. Somehow I am getting a blank reCaptcha response.
It works fine with localhost, but I am having a problem in upper environments like DEV, TEST. User response is being verified on server side (servlet).
Anyone having idea or faced similar problem ? Let me know if you need more info.
String userresponse = (String) request.getAttribute("g-recaptcha-response");
URL url = null;
HttpURLConnection conn = null;
String line, outputString = "";
try {
url = new URL(https://www.google.com/recaptcha/api/siteverify?secret=privateKey&response=userresponse);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
BufferedReader reader = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
while ((line = reader.readLine()) != null) {
outputString += line;
}
Log.debug("Google response is :- "+outputString);
} catch (IOException e) {
e.printStackTrace();
}
When I run this code from Java app I get correct response (UTF-8 encoded).
The problem is, when I run it from my servlet, I'm geting:
"פשטות הי� התחכו� המושל�"
ל×�×•× ×¨×“×• די סר פיירו דה ×•×™× ×¦'×™
Any idea how to fix it?
URL url;
HttpURLConnection conn;
BufferedReader rd;
String line;
String result = "";
try {
url=new URL("http://www.walla.co.il");
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuffer sb = new StringBuffer("");
String s1="";
String NL = System.getProperty("line.separator");
while ((s1 = rd.readLine()) != null)
sb.append(s1+NL);
System.out.println(sb);
rd.close();
return sb.toString();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return "";
set "JAVA_OPTS=%JAVA_OPTS% -Dfile.encoding=UTF8"
i run this from *.bat file in my tomcat\bin
and it fix the problem seems like i had to set the encode for tomcat/jvm
not 100% sure but it works now :)
I'm doing a simple JSON grab from two links with the same code. I'm doing it two separate times, so the cause of my issue isn't because they're running into each other or something.
Here is my code:
#Override
protected String doInBackground(Object... params) {
try {
URL weatherUrl = new URL("my url goes here");
HttpURLConnection connection = (HttpURLConnection) weatherUrl
.openConnection();
connection.connect();
responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
InputStream inputStream = connection.getInputStream();
Reader reader = new InputStreamReader(inputStream);
int contentLength = connection.getContentLength();
char[] charArray = new char[contentLength];
reader.read(charArray);
String responseData = new String(charArray);
Log.v("test", responseData);
When I try this with:
http://www.google.com/calendar/feeds/developer-calendar#google.com/public/full?alt=json
I get an error of having an array lenth of -1
For this link:
http://api.openweathermap.org/data/2.5/weather?id=5815135
It returns fine and I get a log of all of the JSON. Does anyone have any idea why?
Note: I tried stepping through my code in debug mode, but I couldn't catch anything. I also downloaded a Google chrome extension for parsing json in the browser and both urls look completely valid. I'm out of ideas.
Log this: int contentLength = connection.getContentLength();
I don't see the google url returning a content-length header.
If you just want String output from a url, you can use Scanner and URL like so:
Scanner s = new Scanner(new URL("http://www.google.com").openStream(), "UTF-8").useDelimiter("\\A");
out = s.next();
s.close();
(don't forget try/finally block and exception handling)
The longer way (which allows for progress reporting and such):
String convertStreamToString(InputStream is) throws UnsupportedEncodingException {
BufferedReader reader = new BufferedReader(new
InputStreamReader(is, "UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null)
sb.append(line + "\n");
} catch (IOException e) {
// Handle exception
} finally {
try {
is.close();
} catch (IOException e) {
// Handle exception
}
}
return sb.toString();
}
}
and then call String response = convertStreamToString( inputStream );
I have strange problem with BufferedReader reading from web.
This URL content is different in browsers than in pasted Java code.
In content fetched using Java first elements result is empty in browser it is not.
My code:
public static void main(String[] args) {
try {
String url = "https://api.freebase.com/api/service/mqlread?queries={\"q1\":{\"query\":[{\"name\":\"Pulp Fiction\",\"*\":null,\"type\":\"/film/film\"}]},\"q3\":{\"query\":[{\"name\":\"Portal\",\"*\":null,\"type\":\"/cvg/computer_videogame\"}]}}";
URL u = new URL(url);
System.out.println(u.toString());
URLConnection urlConn = u.openConnection();
InputStreamReader is = new InputStreamReader(urlConn.getInputStream());
BufferedReader br = new BufferedReader(is);
String line = null;
String data = "";
while ((line = br.readLine()) != null) {
data += line + "\n";
}
br.close();
System.out.println(data);
} catch (Exception ex) {
System.err.println(ex);
}
}
EDIT: Ahh. Figured it out. No space characters in URLs. Just replace them with %20.