upload file to folder servlet

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Java

JSP

servlet

firstname=lastname="";
       String asn = request.getSession().getAttribute("user").toString();

       response.setContentType("text/html;charset=UTF-8");
       java.io.PrintWriter out = response.getWriter( );
       HashMap<String, String> formdata = new HashMap<String, String>();

        boolean isMultipart = ServletFileUpload.isMultipartContent(request);
     response.setContentType("text/html");

     File file;
      String filePath = request.getServletContext().getRealPath("/StudentImages") + "/" ;
     if( !isMultipart ){

     }
     int maxSize=15*1024*1024;
       MultipartParser parser=  new MultipartParser(request, maxSize);
        com.oreilly.servlet.multipart.Part p=null;
         String sem="";
      String dep="";
      String gender="";
      String email="";
      String cast="";
      String address="";
      String mobile="";
      String bdate="";
      String filename="";
        while((p = parser.readNextPart()) != null)
   {
       if(p.isParam())
       {
           String pName=p.getName();
           if(pName.equals("fname"))
           {
               ParamPart pp=(ParamPart)p;
               dep=pp.getStringValue();
           }
           if(pName.equals("lname"))
           {
               ParamPart pp=(ParamPart)p;
               sem=pp.getStringValue();
           }
           if(pName.equals("gender"))
           {
               ParamPart pp=(ParamPart)p;
               gender=pp.getStringValue();
           }
           if(pName.equals("email"))
           {
               ParamPart pp=(ParamPart)p;
               email=pp.getStringValue();
           }
            if(pName.equals("cast"))
           {
               ParamPart pp=(ParamPart)p;
               cast=pp.getStringValue();
           }
             if(pName.equals("address"))
           {
               ParamPart pp=(ParamPart)p;
               address=pp.getStringValue();
           }
              if(pName.equals("mobile"))
           {
               ParamPart pp=(ParamPart)p;
               mobile=pp.getStringValue();
           }
                 if(pName.equals("bdate"))
           {
               ParamPart pp=(ParamPart)p;
               bdate=pp.getStringValue();
           }

             }
   }


     DiskFileItemFactory factory = new DiskFileItemFactory();
     // maximum size that will be stored in memory
     // Location to save data that is larger than maxMemSize.
     factory.setRepository(new File(filePath + "temp" ));

     // Create a new file upload handler
     ServletFileUpload upload = new ServletFileUpload(factory);

     try{
     // Parse the request to get file items.
     List fileItems = upload.parseRequest(request);

     // Process the uploaded file items
     Iterator i = fileItems.iterator();
     while ( i.hasNext () )
     {
        FileItem fi = (FileItem)i.next();
        if ( !fi.isFormField () && (fi.getContentType().equals("image/jpeg") || fi.getContentType().equals("image/png") ) )
        {
            String fieldName = fi.getFieldName();
           String fileName = fi.getName().trim();
           if(!fileName.equals("")) {
           String contentType = fi.getContentType();
           boolean isInMemory = fi.isInMemory();
           long sizeInBytes = fi.getSize();
           // Write the file
           fileName = asn + ".jpg";
           if( fileName.lastIndexOf("\\") >= 0 ){
              file = new File( filePath + fileName.substring( fileName.lastIndexOf("\\"))) ;
           }else{
              file = new File( filePath + fileName.substring(fileName.lastIndexOf("\\")+1)) ;
           }
           fi.write( file ) ;
           out.println("Uploaded Filename: " + fileName + "<br>");
           }
        }
        if (fi.isFormField()) {
            String name = fi.getFieldName();
            String value = fi.getString();
            formdata.put(name,value);
        }
     }
  }catch(Exception ex) {

      System.out.println(ex);
  }


       try {
           Class.forName("com.mysql.jdbc.Driver").newInstance();
           con = DriverManager.getConnection(connectionparams, uname, psword);
           PreparedStatement prep= con.prepareStatement("UPDATE reg1 SET "
                   + "firstname = ?, lastname = ?, gendar = ?, cast = ?, address = ?, bdate = ?, "
                   + "mobile = ?, email = ?  WHERE asn = ?");
           prep.setString(1,dep);
           prep.setString(2,sem);
           prep.setString(3,gender);
           prep.setString(4,cast);
           prep.setString(5,address);
           prep.setString(6,bdate);
           prep.setString(7,mobile);
           prep.setString(8,email);
           prep.setString(9,asn);
           prep.executeUpdate();
           prep.close();
           int random = new Random().nextInt();
           response.sendRedirect("Studenthome.jsp?rand="+random);
       } catch(Exception E) {
           System.out.println("-----------------------------");
           System.out.println(E);
       }

   }

The code is working perfect but image cant store in Give folder location with coustom name .where is the problem in my code.plz give me suggestion to solve this problem.