To store upload images as blob using the filesystem api. Then be able to access the raw image files via a file/url resource path when wrapped around <img tag or accessed directly through the browser.
On 3/1/12, Jeff Schnitzer <j...@infohazard.org> wrote: > What are you trying to do? > > Jeff > > On Thu, Mar 1, 2012 at 2:29 PM, Kayode Odeyemi <drey...@gmail.com> wrote: > >> 2012/3/1 Ronoaldo José de Lana Pereira <rpere...@beneficiofacil.com.br> >> >>> Hello Odeyemi, >>> >>> If I got your problem right, yes, you can use the Files API to create an >>> image blob, then use the ImageService to create a dedicated URL to serve >>> that image as Jeff said. You can safely cache the generated URL, it will >>> be >>> available as long as you don't delete de blob. >>> >>> Double check that you called the closeFinally as documented here when >>> creating the blob, and use the method >>> getBlobKey<http://code.google.com/intl/en/appengine/docs/java/javadoc/com/google/appengine/api/files/FileService.html#getBlobKey%28com.google.appengine.api.files.AppEngineFile%29>from >>> the Files api to get the blob key after you finalize your file. You >>> can then use this to call the ImageService.getServingUrl(). This proccess >>> works for both your unit tests and the local dev server. >>> >>> I think I implemented this just exactly the way you guys described it: >> >> Here's the code I'm working it: >> >> @RequestMapping(method=RequestMethod.POST) >> public void handleFileRequest(HttpServletRequest request, >> HttpServletResponse response) throws Exception { >> Assert.notNull(request, "HttpServletRequest required"); >> >> // get the POST data >> Map files = request.getParameterMap(); >> Iterator iter = files.values().iterator(); >> List<Object> gg = new ArrayList<Object>(); >> while(iter.hasNext()) { >> gg.add(iter.next()); >> } >> >> log.log(Level.INFO, "Parameter values are {0}", >> request.getParameter("qqfile")); >> >> InputStream stream = request.getInputStream(); >> FileService fileService = FileServiceFactory.getFileService(); >> AppEngineFile writableFile = null; >> >> for(Object s : gg) { >> writableFile = fileService.createNewBlobFile(s.toString()); >> } >> //writableFile = >> fileService.createNewBlobFile(request.getParameter("qqfile")); >> >> // Open a channel to write to it >> boolean lock = false; >> FileWriteChannel writeChannel = >> fileService.openWriteChannel(writableFile, lock); >> ByteBuffer buffer = ByteBuffer.allocateDirect(stream.available()); >> lock = true; >> writeChannel = fileService.openWriteChannel(writableFile, lock); >> writeChannel.write(buffer); >> writeChannel.closeFinally(); >> >> // get the created files path and pass to PrintWriter >> // Now read from the file using the Blobstore API >> BlobKey blobKey = fileService.getBlobKey(writableFile); >> BlobstoreService blobStoreService = >> BlobstoreServiceFactory.getBlobstoreService(); >> >> // MAX_BLOB_FETCH_SIZE = 1015808 >> String segment = new String(blobStoreService.fetchData(blobKey, >> 30, 1024)); >> >> ImagesService imagesService = >> ImagesServiceFactory.getImagesService(); >> String imageUrl = imagesService.getServingUrl(blobKey); >> log.log(Level.INFO, "Imgae url is {0}", imageUrl); >> >> response.setContentType("application/json; charset=UTF-8"); >> PrintWriter out = response.getWriter(); >> out.write("{\"result1\" : " + '\"' + writableFile.getFullPath() + >> '\"' + "}"); >> >> When the file was sent, it wasn't sent with the full path to the file. I >> only got the filename + extension. Something like: file-name.jpg. So I >> just >> simply used that to create the new blob file. >> >> Perhaps I might be doing something wrong. I stand to be corrected. >> >> Thanks >> >>> >>> Em quinta-feira, 1 de março de 2012 14h19min41s UTC-3, drecute escreveu: >>> >>>> On Thu, Mar 1, 2012 at 3:03 PM, Jeff Schnitzer >>>> <j...@infohazard.org>wrote: >>>> >>>>> Look at the documentation for the images service. There is a method >>>>> that gives you a serving url directly to the CDN. >>>>> >>>>> Warning: This method has a surprising amount of latency, you probably >>>>> want to cache the value in memcache for a reasonable duration. >>>>> >>>>> Can the Image Service work with the filesystem where the blob is >>>> stored? Everytime I try to retrieve it using the method you mentioned >>>> getServingUrl(blobkey), I get the error: >>>> >>>> [java] java.lang.**IllegalArgumentException: Failed to read image >>>> [java] at com.google.appengine.api.**images.ImagesServiceImpl.** >>>> getServingUrl(**ImagesServiceImpl.java:222) >>>> >>>> Also, I'm think this action is not possible on the dev server. >>>> >>>>> >>>>> On Thu, Mar 1, 2012 at 7:42 AM, Kayode Odeyemi >>>>> <drey...@gmail.com>wrote: >>>>> >>>>>> Hi everyone, >>>>>> >>>>>> I have images uploaded to the blobstore using filesystem API. The >>>>>> files have been uploaded successfully and I can see the blobs in the >>>>>> respective directory. >>>>>> >>>>>> But then, how do I decode these files such that when sent back to the >>>>>> client or retrieved using the blobstore API, I'm able to get an image? >>>>>> Right now /blobstore/writable:xxx is not useful for me because when I >>>>>> wrap >>>>>> the path in <img src="/blobstore/writable:xxx" />, it doesn't give me >>>>>> an >>>>>> image. >>>>>> >>>>>> Any help is appreciated. >>>>>> >>>>>> Thanks >>>>>> >>>>>> >>>>>> -- >>>>>> Odeyemi 'Kayode O. >>>>>> http://ng.linkedin.com/in/**kayodeodeyemi<http://ng.linkedin.com/in/kayodeodeyemi>. >>>>>> t: @charyorde blog: >>>>>> http://sinati.com/tree/java-**cheat-sheet<http://sinati.com/tree/java-cheat-sheet> >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "Google App Engine" group. >>>>>> To post to this group, send email to google-appengine@googlegroups.** >>>>>> com <google-appengine@googlegroups.com>. >>>>>> To unsubscribe from this group, send email to >>>>>> google-appengine+unsubscribe@**googlegroups.com<google-appengine%2bunsubscr...@googlegroups.com> >>>>>> . >>>>>> For more options, visit this group at http://groups.google.com/** >>>>>> group/google-appengine?hl=en<http://groups.google.com/group/google-appengine?hl=en> >>>>>> . >>>>>> >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Google App Engine" group. >>>>> To post to this group, send email to google-appengine@googlegroups.** >>>>> com <google-appengine@googlegroups.com>. >>>>> To unsubscribe from this group, send email to >>>>> google-appengine+unsubscribe@**googlegroups.com<google-appengine%2bunsubscr...@googlegroups.com> >>>>> . >>>>> For more options, visit this group at http://groups.google.com/** >>>>> group/google-appengine?hl=en<http://groups.google.com/group/google-appengine?hl=en> >>>>> . >>>>> >>>> >>>> >>>> >>>> -- >>>> Odeyemi 'Kayode O. >>>> http://ng.linkedin.com/in/**kayodeodeyemi<http://ng.linkedin.com/in/kayodeodeyemi>. >>>> t: @charyorde blog: >>>> http://sinati.com/tree/java-**cheat-sheet<http://sinati.com/tree/java-cheat-sheet> >>>> >>>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Google App Engine" group. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msg/google-appengine/-/uX0cs5hKeoEJ. >>> >>> To post to this group, send email to google-appengine@googlegroups.com. >>> To unsubscribe from this group, send email to >>> google-appengine+unsubscr...@googlegroups.com. >>> For more options, visit this group at >>> http://groups.google.com/group/google-appengine?hl=en. >>> >> >> >> >> -- >> Odeyemi 'Kayode O. >> http://ng.linkedin.com/in/kayodeodeyemi. t: @charyorde blog: >> http://sinati.com/tree/java-cheat-sheet >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google App Engine" group. >> To post to this group, send email to google-appengine@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/google-appengine?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to google-appengine@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- Odeyemi 'Kayode O. http://ng.linkedin.com/in/kayodeodeyemi. t: @charyorde blog: http://sinati.com/tree/java-cheat-sheet -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. 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