Java file upload and download general version

Upload file version

public void upload2(HttpServletRequest request , HttpServletResponse response){
        //Create a generic multipart parser  
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
        //Determine whether the request has a file upload, that is, a multipart request (that is, check whether there is enctype="multipart/form-data" in the form)
        if(multipartResolver.isMultipart(request)){
            //Convert to multipart request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            //Get the name of all inputs in the request
            Iterator<String> iter = multiRequest.getFileNames();
            while(iter.hasNext()){
                //Get all uploaded files in an input  
                List<MultipartFile> list = multiRequest.getFiles(iter.next());
                for(MultipartFile file : list){
                    if(file != null){
                        //Get the file name of the currently uploaded file
                        String myFileName = file.getOriginalFilename();
                        //If the name is not "", the file exists, otherwise the file does not exist  
                        if(myFileName.trim() != null){
                            //Rename the uploaded file name  
                            String saveName = UUID.randomUUID().toString() + myFileName.substring(myFileName.lastIndexOf("."));
                            //Define the upload path  
                            File localFile = new File("C:\\test\\",saveName);
                            try {
                                //keep
                                file.transferTo(localFile);
                            } catch (IllegalStateException e) {
                                e.printStackTrace ();
                            } catch (IOException e) {
                                e.printStackTrace ();
                            }
                        }
                    }
                }

            }
        }
    }

File Download Universal

// file path
		String filePath = basePath + fileName;

		try {
			File file = new File(filePath);
			if (file.exists()) {
				InputStream fis = new BufferedInputStream(new FileInputStream(
						filePath));
				byte[] buffer = new byte[fis.available()];
				fis.read(buffer);
				fis.close();
				// clear the response
				response.reset();
				// Set the Header of the response
				response.addHeader("Content-Disposition","attachment;filename="
				+ new String(fileName.getBytes("iso8859-1"),"UTF-8"));
				
				response.addHeader("Content-Length", "" + file.length());
				OutputStream toClient = new BufferedOutputStream(
						response.getOutputStream());
				response.setContentType("application/octet-stream");
				toClient.write(buffer);
				toClient.flush();
				toClient.close();
			} else {
				String errorMsg = "No file found, path: " + filePath;
			}
		} catch (Exception e) {
			String errorMsg = "File download, an exception occurred: " + e.getMessage();
		}