Wicket Dynamic Image URL

Question

Short question: I need to turn a dynamic image pulled from a database into a URL without adding a component to the displaying page (such as using a NonCachingImage) using Wi

Answer 1

Here's my example that does the same for a dynamically compiled list of identifiers, served up as a shared resource with a static URL..

public class WicketApplication extends WebApplication {
    ...snip...
    @Override
    protected void init() {
        //Spring
        addComponentInstantiationListener(new SpringComponentInjector(this));

        //Register export lists as shared resources
        getSharedResources().putClassAlias(ListInitializer.class, "list");
        new ListInitializer().init(this);
    }

And my ListInitializer that registers the resources as DBNAME_SUBSELECTION1(2/3/..)

public class ListInitializer implements IInitializer {
    public ListInitializer() {
        InjectorHolder.getInjector().inject(this);
    }

    @SpringBean
    private DatabankDAO dbdao;

    @Override
    public void init(Application application) {
        //For each databank
        for (Databank db : dbdao.getAll()) {
            String dbname = db.getName();
            //and all collection types
            for (CollectionType ct : CollectionType.values()) {
                //create a resource
                Resource resource = getResource(dbname, ct);
                //and register it with shared resources
                application.getSharedResources().add(this.getClass(), dbname + '_' + ct, null, null, resource);
            }
        }
    }

    @SpringBean
    private MyApp   MyApp;

    public Resource getResource(final String db, final CollectionType collectionType) {
        return new WebResource() {
            @Override
            public IResourceStream getResourceStream() {
                List entries = MyApp.getEntries(db, collectionType.toString());
                StringBuilder sb = new StringBuilder();
                for (String entry : entries) {
                    sb.append(entry.toString());
                    sb.append('\n');
                }
                return new StringResourceStream(sb, "text/plain");
            }

            @Override
            protected void setHeaders(WebResponse response) {
                super.setHeaders(response);
                response.setAttachmentHeader(db + '_' + collectionType);
            }
        }.setCacheable(false);
    }
}

I'm sorry but I can't seem to find the tutorial I used to set this up anymore, but it should be evident how this relates to the above example and can be adjusted to do the same for images.. (Sorry for the sparse explanation, if it's still unclear I could come back and edit my answer)