java - Forwarding data from one client to another using server -

i creating android application uses wifi direct transfer data. able send data client server. want send data 1 client client through server. let suppose there 2 clients , c , server b. want send data c through b. there possible way achieve task. 1 thing had heard forward data input stream of 1 socket ouput stream of another. can please me out this.

` protected string doinbackground(void... params) {             try {                 serversocket serversocket = new serversocket(8988);                 log.d(wifidirectactivity.tag, "server: socket opened");                 socket client = serversocket.accept();                 log.d(wifidirectactivity.tag, "server: connection done");                 final file f = new file(environment.getexternalstoragedirectory() + "/"                         + context.getpackagename() + "/wifip2pshared-" + system.currenttimemillis()                         + ".jpg");                  file dirs = new file(f.getparent());                 if (!dirs.exists())                     dirs.mkdirs();                 f.createnewfile();                  log.d(wifidirectactivity.tag, "server: copying files " + f.tostring());                 inputstream inputstream = client.getinputstream();                 copyfile(inputstream, new fileoutputstream(f));                 serversocket.close();                 return f.getabsolutepath();             } catch (ioexception e) {                 log.e(wifidirectactivity.tag, e.getmessage());                 return null;             }         }`