Hi Friends
i try to use the below code
but i got an error at
*PhotoServlet as*
*
*
*Photo photo = PhotoDao.getInstance().getById(Long.parseLong(id));*
"The method getById(long) is undefined for the type
PhotoDao"
can any body help for this?
--------------------------------------------------------------------------------------
Thanks&Regards,
Nagarjuna Ch
Hyderabad,India
Mobile:+91-9949000658 |
"Whoever is happy will make others happy too."
2010/3/15 rissen <[email protected]>
> Step1:Defining a data class named Photo
> public class Photo{
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> private Long id;
>
> @Persistent
> private Blob photo;
> ...
> Set & Get
> ...
> }
>
>
> Step2:Defining a DAO PhotoDAO.java
> public class PhotoDao {
> private static PhotoDao _instance = null;
>
> public static PhotoDao getInstance() {
> if (_instance == null) {
> _instance = new PhotoDao();
> }
> return _instance;
> }
>
> //
> public String insertPhoto(Photo photo) {
> PersistenceManager pm = PMF.get().getPersistenceManager();
> try {
> pm.makePersistent(photo);
> } finally {
> pm.close();
> }
> return photo.getId().toString();
> }
> }
>
>
> Step3:UploadServlet.java
>
> import org.apache.commons.fileupload.FileItemIterator;
> import org.apache.commons.fileupload.FileItemStream;
> import org.apache.commons.fileupload.FileUploadException;
> import org.apache.commons.fileupload.servlet.ServletFileUpload;
> import org.apache.commons.io.IOUtils;
>
> UploadServlet.java
> ...
> ...
> ServletFileUpload upload = new ServletFileUpload();
> FileItemIterator iterator = null;
> try {
> iterator = upload.getItemIterator(req);
> } catch (FileUploadException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> try {
> while (iterator.hasNext()) {
> FileItemStream item = iterator.next();
> InputStream stream = item.openStream();
> if (item.isFormField()) {
> // Handle form field
> } else {
> // Handle the uploaded file
>
> Blob bImg = new
> Blob(IOUtils.toByteArray(stream));
> Photo photo = new Photo(bImg);
> String pid =
> PhotoDao.getInstance().insertPhoto(photo);
>
> //resp.sendRedirect("admin?type=photo&option=list");
> }
>
> }
> ...
> ...
>
>
> Step4: Show the photo which you upload. PhotoSerlvet.java
>
> public class PhotoServlet extends HttpServlet {
> public void doGet(HttpServletRequest req, HttpServletResponse resp)
> throws IOException {
> String id = req.getParameter("id");
> ...
> Photo photo =
> PhotoDao.getInstance().getById(Long.parseLong(id));
> ...
> Blob b = photo.getPhoto();
> resp.setContentType("image/jpeg;charset=utf-8");
> resp.getOutputStream().write(b.getBytes());
> resp.getOutputStream().close();
> }
> }
>
> demo: http://mimaiji.appspot.com/photo?id=4001
>
> On 3月14日, 下午1时12分, nag <[email protected]> wrote:
> > Hi
> > I am trying to build online reg form
> > can u help me how to upload image files to app engine.
> >
> > First: is there any way to upload images in app engine?
> >
> > thanks
> > Nag
>
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