java - Is it possible to check progress of URLconnection.getInputStream()? -

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i want check progress of downloading file urlconnection. possible or should use library? urlconnection function:

public static string sendpostrequest(string httpurl, string data) throws unsupportedencodingexception, malformedurlexception, ioexception {     url url = new url(httpurl);      urlconnection conn = url.openconnection();     //conn.addrequestproperty("content-type", "text/html; charset=iso-8859-2");     conn.setdooutput(true);     outputstreamwriter wr = new outputstreamwriter(conn.getoutputstream());     wr.write(data);     wr.flush();      bufferedreader rd = new bufferedreader(new inputstreamreader(conn.getinputstream(), "iso-8859-2"));     string line, = "";     while ((line = rd.readline()) != null) {         = + line;     }     wr.close();     rd.close();     return all; }

i understand whole file downloaded in line (or worng)?:

bufferedreader rd = new bufferedreader(new inputstreamreader(conn.getinputstream(), "iso-8859-2"));

so possible in code?

just check if http content-length header present in response.

int contentlength = connection.getcontentlength();  if (contentlength != -1) {     // (readbytes / contentlength) * 100 calculate percentage. } else {     // you're lost. show "progress: unknown" }

update per update, you're wrapping inputstream inside bufferedreader , reading inside while loop. can count bytes follows:

int readbytes = 0;  while ((line = rd.readline()) != null) {     readbytes += line.getbytes("iso-8859-2").length + 2; // crlf bytes!!     // line. }

the + 2 cover crlf (carriage return , linefeed) bytes eaten bufferedreader#readline(). more clean approach read inputstream#read(buffer) don't need massage bytes forth , characters calculate read bytes.

see also:


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