java - HttpURLConnection to download file from Servlet not working, direct link works -

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have list of 8,000+ http links pdf files download. reading in each link , calling method downloadfile() , saving local window$ pc. coming across 2 link formats:

  • http://example.com/docs/pdfs/downloadable.pdf
  • http://example.com/docs/download.do?attchmentid=2000

    the first type (direct) works. second 1 not work. when saves file pdf, looks like: 

    <div id="error">     <ul>     </ul> </div> <form id="download" name="download" method="post" action="/caremanager/downloadformcontroller.do?attachmentid=2000"> <input type="hidden" name="attachid" value="2000" >   </form> <script language="javascript" type="text/javascript">  document.forms[0].submit(); </script> </body> </div>

    when follow non-working links in browser's developer tools, getting redirected https site (changing protocol https) javascript files.

    what missing?

    i have tried setting cookiehandler, setting system property http.strictpostredirect true, setting connections setfollowredirects , setinstancefollowredirects true, creating new url connection if forwarded/moved, setting connection setreadtimeout, creating httpsurlconnection ssl. have not worked servlet.

    public static void downloadfile(string downloadurl, string filename) throws exception {      cookiehandler.setdefault( new cookiemanager( null, cookiepolicy.accept_all ) );     // string cookie = cookiemanager.getinstance().getcookie( downloadurl.tostring() );     url url  = new url( downloadurl );     file file = new file( "c:\\temp\\smc1\\" + filename );      httpurlconnection c = (httpurlconnection) url.openconnection();     system.setproperty("http.strictpostredirect", "true");      int responsecode = c.getresponsecode();     inputstream is;      if( responsecode == httpurlconnection.http_moved_perm             || responsecode == httpurlconnection.http_moved_temp             || responsecode == httpurlconnection.http_see_other ) {          // new url (https) httpurlconnection frowarding         url newurl = new url( c.getheaderfield("location") );         httpurlconnection sc = (httpurlconnection) newurl.openconnection();          sc.setfollowredirects(true);         sc.setinstancefollowredirects(true);         responsecode = sc.getresponsecode();         // sc.setreadtimeout(15*1000);          = sc.getinputstream();     } else {         c.setfollowredirects(true);         c.setinstancefollowredirects(true);         responsecode = c.getresponsecode();         = c.getinputstream();     }     // system.out.println( " code: " + responsecode );      fileoutputstream fos = new fileoutputstream( file );      int bytesread;     byte[] buffer = new byte[ 1024 ];     while( ( bytesread = is.read(buffer) ) != -1 ) {         fos.write(buffer, 0, bytesread);     }      if( fos != null ) {         fos.flush();         fos.close();     }     if( != null ) {         is.close();     } }

    i consumer of servlet , have link access. ahead of time!

    • this never work, no matter how code write java default when redirecting.

    the html page auto-posts form causes download when loaded browser. java code never execute that.


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