UPload de arquivos usando ajax!

boolean isMultipart = FileUpload.isMultipartContent(request);
		if (isMultipart) {

			// Create a new file upload handler
			DiskFileUpload upload = new DiskFileUpload();
			
			// Set upload parameters
			upload.setSizeMax(50*1024*1024); //50Mb
			upload.setRepositoryPath(request.getRealPath(""));//("c:/");
	
			// Parse the request
			List items= null;
			try {
				items = upload.parseRequest(request);
		
				// pega campos da tela que invocou a Servlet
				Iterator itAux = items.iterator();
				while (itAux.hasNext()) {
					FileItem fitem = (FileItem) itAux.next();
					if (fitem.getFieldName().equalsIgnoreCase("autor")) {
						autor = fitem.getString().replace(" ","_");
						autor = Utilidades.eliminaAcentuacao(autor);
					} else if (fitem.getFieldName().equalsIgnoreCase("cmd")) {
						cmd = fitem.getString();
					} else if (fitem.getFieldName().equalsIgnoreCase("cod")) {
						cod = fitem.getString();
					}		
					
				}
	
					Iterator it = items.iterator();
					while (it.hasNext()) {			
						FileItem fitem = (FileItem) it.next();		 
						if (!fitem.isFormField()) {
															
							String nomeArq = fitem.getName().substring(fitem.getName().lastIndexOf("\\")+1);
								
							fitem.write(new File(request.getRealPath("")+"\\fotos\\"+nomeArq)); 
							System.out.println(fitem.getName() +"-"+ fitem.getSize() +"bytes");
								
							NgcAutor.atualizaFoto(cod, nomeArq);
							}		
					}
							
				proximo = "ServletControle?cmd=verautor&cod="+cod;
				request.getSession().removeAttribute("erroLoad");				
		
			} catch (FileUploadException e) {
				e.printStackTrace();
				request.getSession().setAttribute("erroLoad", "Tamanho do Arquivo maior que o Permitido!");
			} catch (Exception e) {
				e.printStackTrace();
				request.getSession().setAttribute("erroLoad", e.getMessage());
			}finally{
				try {
					try {
						request.getRequestDispatcher(proximo).forward(request, response);
					} catch (ServletException e) {
						e.printStackTrace();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}
		
			}

		}

// pega campos da tela que invocou a Servlet