Java Server Android client Wifi sending file, socket error -

i have problem sending file server (desktop app) client (android)....

before send file, server send meta data size of file, name etc.....

server side send method:

private void sendpdfdata(outputstream os, file file) throws ioexception {      os.flush();     fileinputstream fis = new fileinputstream(file);     byte[] buffor = new byte[1024];     long count = 0l;     long size = file.length();     int current = 0;         while (count < size) {           current = fis.read(buffor, 0, buffor.length);         os.write(buffor, 0, current);         count += current;     }      fis.close();     os.flush(); } 

client side receive method:

@override protected string doinbackground(void... params) {      string pathtopdf = "";      if (pdf.getlength() > 0) {          inputstream is;          try {             byte b = 0;             clientsocket.getoutputstream().write(b);             = clientsocket.getinputstream();             pathtopdf = pathtoexternalstoragefolder+pdf.getmeta().getname();             pathtopdf = pathtopdf.replace(".\\", "/");             pathtopdf = pathtopdf.replace("\\", "/");             int size = pdf.getlength();             byte[] buffor = new byte[1024];             int current = 0;             int count = 0;              if (pdf.getmeta() != null) {                 fileoutputstream fos = new fileoutputstream(pathtopdf);                  while (count < size) {                     current = is.read(buffor, 0, buffor.length);                     fos.write(buffor, 0, current);                     count += current;                 }                 fos.close();             }          } catch (ioexception e) {             e.printstacktrace();         }     }         return pathtopdf; } 

some random errors when sending file:

java.net.socketexception: software caused connection abort: socket write error java.net.socketexception: connection reset peer: socket write error  file size: 2317679 sended: 44032 

update 08.09.2013

i create desktop client app check server app. when run server , client in netbeans runs great, use interface address (not lopback). when run client jar have issue: file list null on server side not null , not empty, when connect android files list wtfigo - magic.

"this error can occur when local network system aborts connection, such when winsock closes established connection after data retransmission fails (receiver never acknowledges data sent on datastream socket).".

http://msdn.microsoft.com/en-us/library/ms832256.aspx

https://forums.oracle.com/thread/1691330

socket.close() in 1 thread while reading or writing socket, results in exception being thrown since socket closed.

try adding autoreconnect=true jdbc connection string