Gwt SampleUploadServlet, How to save a file into a folder in server (JAVA, GWT)?

I copied this code (allow user to upload image from client to server) from internet https://code.google.com/p/gwtupload/source/browse/samples/src/main/java/gwtuploadsample/server/SampleUploadServlet.java?r=e0b4acbaa632114978b085801a004116b6dbcf52

But it doesn't give an actual code to save the file into a folder in server

package my.server;  public class SampleUploadServlet extends UploadAction{      private static final long serialVersionUID = 1L;      Hashtable<String, String> receivedContentTypes = new Hashtable<String, String>();    /**     * Maintain a list with received files and their content types.      */    Hashtable<String, File> receivedFiles = new Hashtable<String, File>();      /**     * Override executeAction to save the received files in a custom place     * and delete this items from session.       */    @Override    public String executeAction(HttpServletRequest request, List<FileItem> sessionFiles) throws UploadActionException {      String response = "";      int cont = 0;      for (FileItem item : sessionFiles) {        if (false == item.isFormField()) {          cont ++;          try {            /// Create a new file based on the remote file name in the client            // String saveName = item.getName().replaceAll("[\\\\/><\\|\\s\"'{}()\\[\\]]+", "_");            // File file =new File("/tmp/" + saveName);              /// Create a temporary file placed in /tmp (only works in unix)            // File file = File.createTempFile("upload-", ".bin", new File("/tmp"));              /// Create a temporary file placed in the default system temp folder            File file = File.createTempFile("upload-", ".bin");            item.write(file);              /// Save a list with the received files            receivedFiles.put(item.getFieldName(), file);            receivedContentTypes.put(item.getFieldName(), item.getContentType());              //Window.alert(file.getAbsolutePath()+" oook");            //String s=file.getAbsolutePath()+" oook";            /// Send a customized message to the client.            response += "File saved as " + file.getAbsolutePath();            //FileWriter fstream = new FileWriter(file.getAbsolutePath()+"//folder//out.txt",true);            //SEEM WE NEED TO DO SOMETHING HERE TO SAVE A FILE INTO THE FOLDER.          } catch (Exception e) {            throw new UploadActionException(e);          }        }      }       // System.out.println(response);      /// Remove files from session because we have a copy of them      removeSessionFileItems(request);        /// Send your customized message to the client.      return response;    }      /**     * Get the content of an uploaded file.     */    @Override    public void getUploadedFile(HttpServletRequest request, HttpServletResponse response) throws IOException {      String fieldName = request.getParameter(UConsts.PARAM_SHOW);      File f = receivedFiles.get(fieldName);      if (f != null) {        response.setContentType(receivedContentTypes.get(fieldName));        FileInputStream is = new FileInputStream(f);        copyFromInputStreamToOutputStream(is, response.getOutputStream());      } else {        renderXmlResponse(request, response, XML_ERROR_ITEM_NOT_FOUND);     }    }      /**     * Remove a file when the user sends a delete request.     */    @Override    public void removeItem(HttpServletRequest request, String fieldName)  throws UploadActionException {      File file = receivedFiles.get(fieldName);      receivedFiles.remove(fieldName);      receivedContentTypes.remove(fieldName);      if (file != null) {        file.delete();      }    }  }

Sp suppose I have a folder image in Package "server", then How can I save the file into server/image?

(also http://stackoverflow.com/questions/22852538/gwt-sampleuploadservlet-how-to-save-a-file-into-a-folder-in-server-java-gwt)

I think you can do this with only Java knowlege, you don't need Gwt knowledge.

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