Another problem.
When user click on album component, application make a GWT-RPC call to
a servlet wich return a list of image content on abum directory.
List is a String array.
But, when I upload a new image, it's not shown.
Only when i click on reload button on GWT browser, new image are shown.
[CODE]
public void onClick(Widget sender) {
WebPhotoGalleryPhotoViewer viewer = new
WebPhotoGalleryPhotoViewer();
viewer.loadPhotoFromAlbum(album);
}
[...]
public void loadPhotoFromAlbum(String albumName){
cat = albumName;
Window.alert("Load photo from album call");
final LoadPhotoFromAlbumAsync load =
(LoadPhotoFromAlbumAsync)GWT.create(LoadPhotoFromAlbum.class);
ServiceDefTarget endPoint = (ServiceDefTarget)load;
endPoint.setServiceEntryPoint(GWT.getModuleBaseURL()+"load");
AsyncCallback callback = new AsyncCallback()
{
public void onSuccess(Object result)
{
photo = (String[])result;
if(photo.length == 0)
im.setUrl("wpgimg/noPhoto.png");
else
im.setUrl("wpgimg/album/"+ cat + "/" +
photo[totalImageToDisplay]);
im.setPixelSize(600,400);
photoCount.setText("Photo " +
totalImageToDisplay + " of " + photo.length);
}
public void onFailure(Throwable caught)
{
Window.alert("Error in async request: " +
caught.fillInStackTrace());
}
};
load.getImageName(cat, callback);
mainWindow.setText(cat);
mainWindow.show();
}
[/CODE]
Servlet's code is
public class LoadPhotoFromAlbumImpl extends RemoteServiceServlet
implements LoadPhotoFromAlbum{
/**
*
*/
private static final long serialVersionUID = 403L;
public String[] getImageName(String category) {
File photo = new
File("src/com/webphotogallery/public/wpgimg/album/"
+ category);
String[] photoList = photo.list();
return photoList;
}
}
I think problem is not in Upload servlet but i post is code if necessary.
Daniele.
2009/1/8, Daniele <[email protected]>:
> I think to use GWT's version of tomcat because application it's not
> implemented for business world, but only for my thesis.
> However link it's good to bookmarks! :)
>
> 2009/1/7 Nick <[email protected]>:
>>
>> Gregor wrote "if you want to create a directory somewhere else on the
>> host machine
>> disk (i.e. not part of the Tomcat set up) to store the images you need
>> to do more work. "
>>
>> You can add your external directory to tomcat's path. So basically D:
>> \images could be pathed to localhost:8080/YourApp/images
>> Then you can access them very easily using GWT by creating an Image
>> object and calling setURL("images/mycat.jpg");
>> Look at this to set up your path:
>> http://whatwouldnickdo.com/wordpress/157/tomcat-images-directory/
>>
>>
>> On Jan 6, 12:06 pm, gregor <[email protected]> wrote:
>>> I think the public part is assumed. If yourimagesare located in
>>> public/category then they should be accessible via the URL:
>>>
>>> String imageURL = GWT.getModuleBaseURL() + "category/" + fileName;
>>>
>>> if you want to create adirectorysomewhere else on the host machine
>>> disk (i.e. not part of theTomcatset up) to store theimagesyou need
>>> to do more work. You could use an ordinary HttpServlet (not a GWT RPC
>>> servet) to do it, something like:
>>>
>>> // assume you have passed "category" and "imageFileName" as
>>> parameters to the servlet.
>>> // in HttpServlet.doGet(..)
>>> FileInputStream in = new FileInputStream(new File(UPLOAD_DIRECTORY/
>>> + category/ + ImageFileName))
>>> response.setContentType("image/jpeg"); // or gif,png etc
>>> OutputStream out = response.getOutputStream();
>>> try {
>>> byte[] buffer = new byte[1024];
>>> int len;
>>> while ((len = in.read(buf)) > 0) {
>>> out.write(buffer, 0, len);
>>> }
>>> in.close();
>>> out.close();
>>> } catch (IOException e) {
>>> // do something
>>> }
>>>
>>> The effect of that it to make the browser believe it's just getting an
>>> image from a URL. You can't use GWT RPC because it won't deal with
>>> binary data (e.g. an image file). Look up "HttpServlet image download"
>>> on Google for examples.
>>>
>>> On Jan 6, 4:00 pm, Daniele <[email protected]> wrote:
>>>
>>> > I put category folder under public/ folder.
>>> > Same problem.
>>> > I do set UPLOAD_DIRECTORY with
>>> > ./src/com/webphotogallery/public/category because only public/category
>>> > doesn't work.
>>>
>>> > I try to create a tempdirectoryon /home/dany/TESI/project and we'll
>>> > put indirectoryimagesthat I use in my application
>>>
>>> > Daniele
>>>
>>> > 2009/1/4, gregor <[email protected]>:
>>>
>>> > > Hi Daniele,
>>>
>>> > > Your problem is that:
>>>
>>> > > private static String UPLOAD_DIRECTORY =
>>> > > "./src/com/webphotogallery/server/category/";
>>>
>>> > > does not exist under the temporary GWT dev shellTomcatinstance
>>> > > created when you run hosted mode, whatever your development
>>> > > environment. To sort this out you will have to think through where in
>>> > > a production environment the photos would actually be stored.
>>>
>>> > > To do this quick and get it to work in hosted mode, I think if you
>>> > > put
>>> > > them under the /publicdirectoryrather than /server, it might do the
>>> > > trick.
>>>
>>> > > regards
>>> > > gregor
>>>
>>> > > On Jan 4, 1:13 pm, Daniele <[email protected]> wrote:
>>> > >> It's doesn't work.
>>> > >> My projectdirectorystructure is:
>>>
>>> > >> /home/dany/TESI/projects/WebPhotoGallery/
>>> > >> -- build/
>>> > >> -- src
>>> > >> -- com
>>> > >> -- webphotogallery
>>> > >> -- server
>>> > >> -- category
>>> > >> -- [...]
>>> > >> -- client
>>> > >> -- public
>>> > >> --tomcat
>>> > >> -- WebConten
>>>
>>> > >> (I use Eclipse with Cypal studio plugin)
>>>
>>> > >> On servlet, the code for create categorydirectoryis:
>>>
>>> > >> private static String UPLOAD_DIRECTORY =
>>> > >> "./src/com/webphotogallery/server/category/";
>>> > >> [...]
>>>
>>> > >> if((it.getFieldName().equals("categoryBox"))){
>>> > >> String categoryFolder =
>>> > >> it.getString();
>>>
>>> > >> UPLOAD_DIRECTORY = UPLOAD_DIRECTORY
>>> > >> +
>>> > >> categoryFolder;
>>> > >> [...]
>>> > >> where categoryFolder is passed by client with a form.
>>> > >> But when I call setURL() method on client, what URL I
>>> > >> put??http://localhost:8888/com.webphotogallery.WebPhotoGallery/category/ca...
>>> > >> not works.
>>>
>>> > >> I'm totally disoriented.
>>>
>>> > >> Thanks.
>>>
>>> > >> Daniele.
>>>
>>> > >> 2008/12/28 Daniele <[email protected]>:
>>>
>>> > >> > Sorry, but I'm newbie of servlet & GWT...I'm here for learning GWT
>>> > >> > and
>>> > >> > servlet :)
>>> > >> > I try.
>>> > >> > Thanks.
>>>
>>> > >> > Daniele.
>>>
>>> > >> > 2008/12/28 rakesh wagh <[email protected]>:
>>>
>>> > >> >> Cannot comment on what you are doing wrong without looking into
>>> > >> >> the
>>> > >> >> code. However I see no need for setUrl on server side. You should
>>> > >> >> have
>>> > >> >> a "Servlet" that will parse the parameters, read the appropriate
>>> > >> >> image
>>> > >> >> file(either file system or db or any doc mgmt system for that
>>> > >> >> matter),
>>> > >> >> set a proper content type and just spit out the byte stream.
>>>
>>> > >> >> From the client just call this servlet with appropriate params
>>> > >> >> for it
>>> > >> >> to retrieve the image. In essence:
>>> > >> >> Image img = new Image();
>>> > >> >> img.setUrl("/servlet?photoId=39934&width=50");
>>>
>>> > >> >> Rakesh Wagh
>>>
>>> > >> >> On Dec 26, 4:26 pm, Daniele <[email protected]> wrote:
>>> > >> >>> I cannot planning image manipulation.
>>> > >> >>> Ifimagesare on client sides, setUrl() etc it works.
>>>
>>> > >> >>> On server side, I have an undefined number of folders that
>>> > >> >>> represent
>>> > >> >>> photo category, but if I put on setUrl() method path to folders
>>> > >> >>> on
>>> > >> >>> server, it's not work.
>>>
>>> > >> >>> 2008/12/26 rakesh wagh <[email protected]>:
>>>
>>> > >> >>> > ask yourself:
>>> > >> >>> > Even if you get your image/files using rpc, what will you do
>>> > >> >>> > with
>>> > >> >>> > it?
>>> > >> >>> > I mean there is no real application of getting binary files
>>> > >> >>> > using
>>> > >> >>> > rpc
>>> > >> >>> > yet. Are you planning to do image manipulations like rotation,
>>> > >> >>> > filters, etc on the client side? js is not yet ready for that.
>>> > >> >>> > However
>>> > >> >>> > if you wish, you can get the entire file using rpc method. But
>>> > >> >>> > sticking it to the image tag is very difficult. Search through
>>> > >> >>> > the
>>> > >> >>> > group, some one mentioned how you can embed the actual bytes
>>> > >> >>> > and
>>> > >> >>> > construct a img tag that will display the image. Good luck,
>>> > >> >>> > because
>>> > >> >>> > that is very non standard and your millage can greatly vary.
>>>
>>> > >> >>> > You might also want to look at Gears, it allows you to store
>>> > >> >>> > and
>>> > >> >>> > retrieve Blobs in client database... not sure if it has to do
>>> > >> >>> > anything
>>> > >> >>> > with your requirement but will come handy if you are playing a
>>> > >> >>> > lot
>>> > >> >>> > with files etc. ..
>>>
>>> > >> >>> > Rakesh Wagh
>>>
>>> > >> >>> > On Dec 24, 8:01 am, Daniele B <[email protected]> wrote:
>>> > >> >>> >> Hi.
>>> > >> >>> >> I work on a photogallery application for my thesis.
>>> > >> >>> >> I have a problem.
>>> > >> >>> >> How can I do to retrieve image files stored on a server
>>> > >> >>> >> folder
>>> > >> >>> >> trought
>>> > >> >>> >> GWT-RPC?
>>>
>>> > >> >>> >> Thanks at all!
>>> > >> >>> >> Sorry fo my english!!! :)
>>>
>>> > >> >>> >> Daniele.
>> >>
>>
>
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