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 <nagarjuna...@gmail.com> 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 -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.