Also.
> private LinkSource linkSource;
This is an internal class, you should be using PageRenderLinkSource.
You can replace:
> linkSource.createPageRenderLink(DisplayImagePage.class.getSimpleName(),
> false, new Object[]{imageId});
with
pageRenderLinkSource.createPageRenderLinkWithContext(DisplayImagePage.class,
imageId);
Josh
On Fri, Aug 5, 2011 at 1:39 PM, David Canteros
<davidcanteros....@gmail.com> wrote:
> Hi
> I have to show a image loaded from database BLOB field. I implemented
> Thiago's suggestion, I have created a page with the following code:
>
> public class ShowImagePage {
>
> @Inject
> private LinkSource linkSource;
> (...)
>
> public Link *getUploadedFile*(String imageId) {
> return
> linkSource.createPageRenderLink(DisplayImagePage.class.getSimpleName(),
> false, new Object[]{imageId});
> }
>
> public StreamResponse *onActivate*(String imageId) {
> this.filename = imageId;
> return new StreamResponse() {
>
> public String *getContentType*() {
> return contentType;
> }
>
> public InputStream *getStream*() throws IOException {
> User user =
> (User)_request.getSession(true).getAttribute("user");
> return user.getImage();
> }
>
> public void *prepareResponse*(Response response) {
> response.setHeader("Content-Disposition", "inline;
> filename=" + filename
> + ((extension == null) ? "" : ("." +
> extension)));
> }
> };
> }
> }
> **
> In the javacode of the page where i have to show the image, I injected the
> above page and wrote this method
>
> public Link *getImageLink*(ImageId){
> return showImagewPage.getUploadedFile(imageId);
> }
> and in html code I put this:
>
> <img src="${imageLInk}"/>
>
> It works fine, the image is showed but when I refresh the page (with F5),
> the image dissapear. It behavior does not occur if I submit some form placed
> in the same page that refresh the page too (the method "onSubmitFrom..."
> returns "this" ). I have debugged the code and everything works fine, do you
> have any idea about this behavior?
>
> Thanks!!
>
> ------------------------------------------------------------------
> David Germán Canteros
>
>
> 2011/3/11 Rich M <rich...@moremagic.com>
>
>> Thanks everyone for the responses so far, conceptually I think this is
>> coming together for me.
>>
>> So, I'm glad the context path was not a good idea, it felt dirty from the
>> beginning. Avoiding that, there are two main options: use the database to
>> store/retrieve the images, or use a configured system folder from where I
>> can load/save files with Java IO.
>>
>> Regardless of the option chosen there, the image file will be captured as
>> an InputStream and returned as a StreamResponse in some form to a
>> page/component.
>>
>> As far as linking the StreamResponse to an HTML IMG tag, I believe I
>> understand the various options presented here.
>>
>> LLTYK suggests using an EventLink. I was looking through my code and found
>> a Captcha implementation I have using a propertyExpression in the TML on the
>> src attribute of <IMG> to reference a getImageLink function that returns
>> ComponentResources.**createActionLink("image",null)**. Then there is an
>> onImage() action handler method that returns a StreamResponse. I understand
>> this is ActionLink and not EventLink, but I think the concept must be nearly
>> identical.
>>
>> Alternately, Thiago is suggesting that instead of using ComponentResources
>> to generate an ActionLink or EventLink, it may be easier to create a
>> seperate Page that handles returning just a StreamResponse. In that case the
>> EventLink can be replaced with a PageLink and using an activation context
>> the ID for the Image can be passed to the Page so it can load the Image,
>> build the StreamResponse, and return it.
>>
>> <30 minutes later> Okay, the PageLink works out, great! I can see the
>> biggest issue I was having was setting up the src attribute for IMG
>> correctly. I was stuck thinking it was either the URL to the context path or
>> the StreamResponse itself, rather than a link to an event or page that
>> returns the StreamResponse.
>>
>> Thanks,
>> Rich
>>
>>
>>
>> On 03/11/2011 08:08 AM, Thiago H. de Paula Figueiredo wrote:
>>
>>> On Fri, 11 Mar 2011 09:24:35 -0300, LLTYK <ll...@mailinator.com> wrote:
>>>
>>> Nobody's mentioned createEventLink. That's where you get the image url,
>>>> create an event link pointing to the event handler that returns the
>>>> stream response.
>>>>
>>>
>>> I haven't mentioned it because my preferred approach is to create a page
>>> just for returning StreamResponses. It's more reusable, as it can be used to
>>> serve images for any page, while an event must be only used inside a give
>>> page.
>>>
>>>
>>
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>>
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