Mike Watson wrote:
Hi Folks,
I'm trying to figure out how to return binary data from the REST plugin.
I'd like to be able to return images that are generated on the fly by
a REST request but looking at ContentTypeHandlerManager, it assumes
that we'll only ever want to return a string and so passes a
StringWriter as the output for implementers of
ContentTypeHandler.fromObject.
At first, don't create a custom ContentTypeHander.
Just have your Controller declare a StreamResult. The default
ContentTypeHandler will drop through for result processing by XWork (as
per a ServletRedirectResult).
eg. GET /namespace/image/21
@Result("stream", type = StreamResult.class, value="image")
class ImageController {
public InputStream getImage() {}
public String show() {
// create the stream
return "stream";
}
}
See StreamResult for how to set the Content-type and other properties.
One that works, you could (potentially) register a ContentTypeHandler
for each image content type you want to return (eg. register the jpg and
png extensions). The ContentTypeHandler should do nothing except return
a result name for XWork that is mapped to a StreamResult. The image
retrieval would have to be performed in the Controller rather than the
Handler though. There is probably a bit of work to do in the plugin to
handle binary results better though.
Hope that gets you started.
Jeromy Evans
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