@SuppressWarnings("unchecked")
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    HttpSession session = request.getSession();

    if (ServletFileUpload.isMultipartContent(request)) {
      try {

   
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html");

        FileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);

        List<FileItem> items = upload.parseRequest(request);

        logger.info("Items size: " + items.size());
        File file = null;
        String fileName = null;
        for (FileItem item : items) {
          DiskFileItem diskFileItem = (DiskFileItem) item;
          file = diskFileItem.getStoreLocation();
          logger.info("Uploaded file: " + file);
          getMD5(file);          
          fileName = item.getName();
          logger.info("Uploaded file name: " + fileName);
....
      }
      catch (Exception e) {
        logger.error(e.getMessage(), e);
        response.getWriter().print(e.getMessage());
      }
    }
    else {
      response.getWriter().print("Не поддерживаемый формат запроса");
    }
  }