How to handle Server side HTTP file upload from Java client -

i want upload file client server.

client: java using http post server: java servlet

i have added client side coding here. but, don't have idea server side processing. please me code snippet.

 private string tag = "uploader";     private string urlstring = "http://192.168.42.140:8080/sampweb";     httpurlconnection conn;     string exsistingfilename = "/sdcard/log.txt";     string lineend = "\r\n";     string twohyphens = "--";     string boundary = "*****";     try {         // ------------------ client request          log.e(tag, "inside second method");          fileinputstream fileinputstream = new fileinputstream(new file(                 exsistingfilename));          // open url connection servlet          url url = new url(urlstring);          // open http connection url          conn = (httpurlconnection) url.openconnection();          // allow inputs         conn.setdoinput(true);          // allow outputs         conn.setdooutput(true);          // don't use cached copy.         conn.setusecaches(false);          // use post method.         conn.setrequestmethod("post");          conn.setrequestproperty("connection", "keep-alive");          conn.setrequestproperty("content-type",                 "multipart/form-data;boundary=" + boundary);          dataoutputstream dos = new dataoutputstream(conn.getoutputstream());          dos.writebytes(twohyphens + boundary + lineend);         dos                 .writebytes("content-disposition: post-data; name=uploadedfile;filename="                         + exsistingfilename + "" + lineend);         dos.writebytes(lineend);          log.e(tag, "headers written");          // create buffer of maximum size          int bytesavailable = fileinputstream.available();         int maxbuffersize = 1000;         // int buffersize = math.min(bytesavailable, maxbuffersize);         byte[] buffer = new byte[bytesavailable];          // read file , write form...          int bytesread = fileinputstream.read(buffer, 0, bytesavailable);          while (bytesread > 0) {             dos.write(buffer, 0, bytesavailable);             bytesavailable = fileinputstream.available();             bytesavailable = math.min(bytesavailable, maxbuffersize);             bytesread = fileinputstream.read(buffer, 0, bytesavailable);         }          // send multipart form data necessary after file data...          dos.writebytes(lineend);         dos.writebytes(twohyphens + boundary + twohyphens + lineend);          // close streams         log.e(tag, "file written");         fileinputstream.close();         dos.flush();         dos.close();      } catch (malformedurlexception ex) {         log.e(tag, "error: " + ex.getmessage(), ex);     }      catch (ioexception ioe) {         log.e(tag, "error: " + ioe.getmessage(), ioe);     }      try {         bufferedreader rd = new bufferedreader(new inputstreamreader(conn                 .getinputstream()));         string line;         while ((line = rd.readline()) != null) {             log.e("dialoge box", "message: " + line);         }         rd.close();      } catch (ioexception ioex) {         log.e("mediaplayer", "error: " + ioex.getmessage(), ioex);     } } 

i'm new server programming. if have done mistakes clarify me. thanks!

the best library achieve still apache commons file upload. documented , easy use. if ran issues, please check faq first.