Annotation Type GraphicImageBean
-
@Inherited @Documented @Stereotype @Named @ApplicationScoped @Retention(RUNTIME) @Target(TYPE) public @interface GraphicImageBean
Stereo type that designates a bean with one or more methods returning
byte[]
orInputStream
as a named application scoped bean specifically for serving graphic images via<o:graphicImage>
component or#{of:graphicImageURL()}
EL functions.import org.omnifaces.cdi.GraphicImageBean; @GraphicImageBean public class Images { @Inject private ImageService service; public byte[] get(Long id) { return service.getContent(id); } }
When using
@Named @ApplicationScoped
instead, serving graphic images via a Faces page will continue to work, but when the server restarts, then hotlinking/bookmarking will stop working until the Faces page referencing the same bean method is requested for the first time. This is caused by a security restriction which should prevent users from invoking arbitrary bean methods by manipulating the URL. The@GraphicImageBean
basically enables endusers to invoke any public method returning abyte[]
orInputStream
on the bean by just a HTTP GET request.Usage
You can use
#{of:graphicImageURL()}
EL functions to generate URLs referring the@GraphicImageBean
bean, optionally with the imagetype
andlastModified
arguments. Below are some usage examples:<ui:repeat value="#{bean.products}" var="product"> <!-- Basic, using default type and last modified. --> <a href="#{of:graphicImageURL('images.full(product.imageId)')}"> <o:graphicImage value="#{images.thumb(product.imageId)}" /> </a> <!-- With specified type and default last modified. --> <a href="#{of:graphicImageURLWithType('images.full(product.imageId)', 'png')}"> <o:graphicImage value="#{images.thumb(product.imageId)}" type="png" /> </a> <!-- With specified type and last modified. --> <a href="#{of:graphicImageURLWithTypeAndLastModified('images.full(product.imageId)', 'png', product.lastModified)}"> <o:graphicImage value="#{images.thumb(product.imageId)}" type="png" lastModified="#{product.lastModified}" /> </a> </ui:repeat>
Note that in the
#{of:graphicImageURL()}
EL functions the expression string represents the same value as you would use in<o:graphicImage>
and that it must be a quoted string. Any nested quotes can be escaped with backslash.The
type
argument/attribute is the image type represented as file extension. E.g. "jpg", "png", "gif", "ico", "svg", "bmp", "tiff", etc. When unspecified then the content type will default to"image"
without any subtype. This should work for most images in most browsers. This may however fail on newer images or in older browsers. In that case, you can explicitly specify the image type via thetype
argument/attribute which must represent a valid file extension.The
lastModified
argument/attribute is the "last modified" timestamp, can beLong
orDate
, or otherwise an attempt will be made to parse it asLong
. When unspecified, then the "default resource maximum age" as set in either the Mojarra specific context parametercom.sun.faces.defaultResourceMaxAge
or MyFaces specific context parameterorg.apache.myfaces.RESOURCE_MAX_TIME_EXPIRES
will be used, else a default of 1 week will be assumed.- Since:
- 2.5
- Author:
- Bauke Scholtz
- See Also:
GraphicImage
,GraphicResource
,DynamicResource
,GraphicResourceHandler
,DefaultResourceHandler
,ExpressionInspector
,MethodReference