My code sends HttpConnection and then tries to use either connection.getInputStream() or connection.getErrorStream() to deserialize response.
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())); // getErrorStream()
String content = in.lines().collect(Collectors.joining());
How can I pass connection to parse(HttpURLConnection connection) function and call connection.disconnect() after it's finished()?
I was thinking about
connection.disconnect();
return MyObject.fromString(connection.getInputStream(), connection.getErrorStream());
but not sure whether it makes sense to disconnect before reading the response.
You can do something like this:
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
String content = parse(connection);
connection.disconnect();
// do something with content
Related
when you open a connection via URLConnection to read the content of a Webpage,
try {
URL url = new URL("https://stackoverflow.com/questions/46939965/does-java-urlconnection-send-metadata");
URLConnection urlConnection = url.openConnection();
HttpURLConnection connection;
connection = (HttpURLConnection) urlConnection;
BufferedReader in = new BufferedReader(
new InputStreamReader(connection.getInputStream()));
String current;
while((current = in.readLine()) != null) {
urlString += current;
}
}catch(IOException e) {
e.printStackTrace();
}
what will Java leave for Information?
Will statistical data like the Webbrowser saved? Will that be the "Java"?
Thx for help,
~Corn
HTTP "metadata" is normally sent in the headers. The one that would indicate the web browser is typically called "USER_AGENT." I do not believe Java will populate these headers for you implicitly.
URL url = new URL("url");
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);// i can delete this nothing happens
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(valueIWantToSend);
wr.flush();
wr.close();
Reader in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));
This code above post my value: valueIWantToSend to my server. Everything is working fine, but i want to ask: Why then i remove this line:
Reader in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));
Nothing is shown on my server, but then i add this line everything is working great, but why ? I am not using Reader in this connection so what i miss understood?
I think u should call urlConnection.connect()
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("POST");
urlConnection.connect();
I am trying to do what I thought was a simple task. I need to POST data to a PHP server. I have tried this solution but in Apache HttpClient 4.5 I can't find BasicNameValuePair in the package. Upon further research I thought I'd try StringEntity...nope not in 4.5 either (that I can find at least). So I tried to do it with HttpsURLConnection. The problem with that is I can't figure out how to add a name to my parameter and with a name, I don't know how to access in PHP with $_POST['name'].
My Current Code:
String json = gson.toJson(data);
URL url = new URL("https://www.domain.com/test.php");
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length", String.valueOf(json.length()));
OutputStream os = conn.getOutputStream();
os.write(json.getBytes());
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String decodedString;
while ((decodedString = in.readLine()) != null) {
System.out.println(decodedString);
}
in.close();
Try to use DataOutputStream and flush it afterward.
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeChars(json);
wr.flush();
wr.close();
i'm trying to run a soap request in a basic http request...naturally i tried with external tools the message and is correct, like the endpoint i'm using as targetUrl, the wsdl is in something like
http://00.00.00.00/a-ws/services/basic?wsdl
and my actual end point is
http://00.00.00.00/a-ws/services/basic.targetservice
and i'm using this last as target url
URL url = new URL(targetUrl);
connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "text/xml;charset=UTF-8");
connection.setRequestProperty("SOAPAction", action);
connection.setRequestProperty("User-Agent", "myagent");
connection.setRequestProperty("Host", "localhost");
//connection.setRequestProperty("Content-Length", "" + Integer.toString(message.getBytes().length));
connection.setUseCaches (false);
connection.setDoInput(true);
connection.setDoOutput(true);
//Send request
OutputStream wr = connection.getOutputStream ();
wr.write (message.getBytes());
wr.flush ();
wr.close ();
//Get Response
InputStream is = connection.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
String line=null;
StringBuffer response = new StringBuffer();
while( (line = rd.readLine()) != null) {
if (line!=null)
response.append(line);
}
rd.close();
return response.toString();
the raw message is tested with chrome plugin, the only thing i can't test is headers but the result is always an exception on getInputStream
java.io.IOException: Server returned HTTP response code: 500 for URL:
why?
It was a very stupid issue of encoding (like I was supposing)...i didn't escape double quote inside the message.
The evidence of problem was visible using a fake http server that just echo contents.
UPDATE:
Another thing nobody already pointed out is that is useful in case of exception to retrieve
connection.getErrorStream()
that contains the response in case of error!
I'm trying to make a rest request in java. I tested the web service using RestClient in Firefox and it works great.
When i try to modify the HttpsUrlConnection instance in java the values aren't changing and i get a 500 response code.
Here's my code:
public String getAuthToken() throws IOException {
URL url =new URL("https://webserviceurl"); // webservice url is the url of the webservice
String data = URLEncoder.encode("username") + "=" + URLEncoder.encode("myusername","UTF-8");
data+= "&" + URLEncoder.encode("password") + "=" + URLEncoder.encode("pass","UTF-8");
HttpsURLConnection conn =(HttpsURLConnection) url.openConnection();
conn.setUseCaches(false);
conn.setHostnameVerifier(new AllowAllHostnameVerifier()); //this works HostName verifier changes
conn.setRequestMethod("POST"); // this doens't work. requestMethod is still set to GET
conn.setDoOutput(true); // this doesnt work. DoOutput still set on false
conn.setRequestProperty("Content-Type", "application/json"); // doens't work either
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream(),"UTF-8");
wr.write(data);
wr.flush();
wr.close();
//conn has a 500 response code
if (conn.getResponseCode()==200)
{
InputStream is = conn.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader rd = new BufferedReader(isr);
String token = rd.readLine();
rd.close();
return token;
}
else
return null;
}
I'm stucked at this point and cannot find anything to make this work.
Thank you!
I actually think it's a bug with HttpsURLConnection. As i changed it to a HttpURLConnection object everything works just fine.