java - A one step upload for uploading images using google app engine -


i trying implement basic functionality of uploading images android,iphone , web clients google app engine. did initial version of implementation this blog:

however there seems 2 step process uploading image:

  1. get initial upload url post using createuploadurl(). attaching fragment of code use : 
     public class createuploadurl extends httpservlet {      @override     public void doget(httpservletrequest req, httpservletresponse resp) throws ioexception {         blobstoreservice blobstoreservice = blobstoreservicefactory.getblobstoreservice();         string uploadurl = blobstoreservice.createuploadurl("/image/uploadimage");         resp.setcontenttype("text/plain");         resp.getwriter().println(uploadurl);     } }
  1. post image using url "got" 
      public void dopost(httpservletrequest req, httpservletresponse res) throws servletexception, ioexception {         blobkey blobkey = parameterextractor.getblobparameter(req, "blob-key", blobstoreservice);         if (blobkey == null) {             log.info("blob id null. post failed");         } else {             log.info("ze business logic");         }     }

my question if possible in 1 step since right clients need http get upload url , http post post image.

is not possible 1 http post predefined url.

thanks rajat

this possible, limitations. can bypass uploadurl mechanism creating blobs directly in servlet using (currently experimental) createnewblobfile api. in mobile app(s) create http request encoded multipart/form-data, , teach servlet how decode such thing (consult e.g. how upload files in jsp/servlet?). aware http requests limited 32mb; form encoding amount of binary data can upload less that.


Comments

Post a Comment

Popular posts from this blog

java - Play! framework 2.0: How to display multiple image? -

i need display gallery of photos. here template: @(photos: list[photo]) @title = { <bold>gallery</bold> } @main(title,"photo"){ <ul class="thumbnails"> @for(photo <- photos) { <li class="span3"> <a href="#" class="thumbnail"> <img src="@photo.path" alt=""> </a> </li> } </ul> } and here controller method: public static result getphotos() { return ok(views.html.photo.gallery.render(photo.get())); } and here photo bean : @entity public class photo extends model { @id public long id; @required public string label; public string path; public photo(string path, string label) { this.path = path; this.label = label; } private static finder<long, photo> find = new finder<long, photo>( long.class, photo.class); public static list<phot...
Read more

gmail - Is there any documentation for read-only access to the Google Contacts API? -

i want read-only access user's google contacts. there stackoverflow member wanted this, , received following answer : yes, there is, use https://www.googleapis.com/auth/contacts.readonly scope , "view contacts". this exchange reference read-only access google contacts can find using google. simply using access token obtained attempt read usual google contacts api (i.e. https://www.google.com/m8/feeds ) fails insufficient permissions. similarly, using google contacts api on new target fails 404 errors (for example https://www.googleapis.com/auth/contacts.readonly/default/full ). is there documentation anywhere on how use api, or permissible way access google contacts api full read-write access?
Read more

php - Controller/JToolBar not working in Joomla 2.5 -

relevant code: jtoolbarhelper::custom('savecategories', 'save', '', 'save', false, false); ... <input type="hidden" name="controller" value="easyblogcontroller"> according can dig docs , own previous questions, should call savecategories() function in easyblogcontroller . i've tried setting value easyblog , easyblog.php (file name) current easyblogcontroller (class name). clicking on save button refreshes page. not redirect, echo or var_dump test code put in savecategories() function. var_dump ing jrequest::getvar('controller') , 'task' return correct values. creating controller object , using $controller->execute('task'); works. the values going depend on location of controller trying call, , have couple options here. typically there controller in base folder of component (likely components/com_easyblog) in file called controller.php , class name inside ...
Read more