Did you try searching the wiki about this? http://cwiki.apache.org/WICKET/uploaddownload.html
There might be more... V. Jenks wrote:
I'm having non-stop issues w/ DynamicWebResource and trying to load images external to my .ear deployment now that I've moved to 1.3. First off, I'm hoping someone can suggest an easier way to do it because what I have now is code that someone was nice enough to give me, here on the Wicket mailing list. However, I don't entirely understand how it works and while it worked for 2 years in Wicket 1.2, it is now causing me problem after problem in Wicket 1.3.x - for whatever reason. First what I've got is a class called ImageResource which extends DynamicWebResource: /*****************************************************/ public class ImageResource extends DynamicWebResource { private ImageService imgSrv; public ImageResource() { super(); imgSrv = new ImageServiceEngine(); } public String getImage(String image) { String retImg = null; try { retImg = imgSrv.getImage(image).toString(); } catch (IOException exp) { LogProxy.saveEntry(exp); } return retImg; } protected ResourceState getResourceState() { ImageResourceState state = null; try { ValueMap params = getParameters(); byte[] data = null; String imageId = params.getString("file");//Date lastModified = getImageLastMod(imageId);state = new ImageResourceState(Time.valueOf(new Date())); state.setContentType("image/jpeg"); //SECURITY PRECAUTION - DO NOT ALLOW ANYTHING BUT IMAGES!if (imageId.contains(PropertyProxy.getExternalImagesRoot()) || imageId.contains(PropertyProxy.getExternalImagesAltRoot())){ data = imgSrv.getImage(imageId); } else { //change image to "not found" warning image data = imgSrv.getImage(PropertyProxy.getImageNotFound()); //TODO: send email to notify of inappropriate access } state.setData(data); } catch (FileNotFoundException exp) { LogProxy.saveEntry(exp); } catch (IOException exp) { LogProxy.saveEntry(exp); } catch (NullPointerException exp) { LogProxy.saveEntry(exp); } return state; } /*** * @author vjenks * */protected class ImageResourceState extends ResourceState { private String contentType; private byte[] data; private Time lastModified; ImageResourceState(Time lastModified) { super(); this.lastModified = lastModified; } public String getContentType() { return contentType; } void setContentType(String contentType) { this.contentType = contentType; } public byte[] getData() { return data; } void setData(byte[] data) { this.data = data; } public int getLength() { if (data != null) return data.length; else return 0; } public Time lastModifiedTime() { return lastModified; } } } /*****************************************************/ You can see that it uses a class called ImageServiceEngine: /*****************************************************/ public class ImageServiceEngine implements ImageService, Serializable { private int thumbnailSize; public ImageServiceEngine() { super(); } public int getThumbnailSize() { return this.thumbnailSize; } public void setThumbnailSize(int size) { this.thumbnailSize = size; } public byte[] getImage(String image) throws IOException { // Open the file, then read it in. ByteArrayOutputStream outStream = new ByteArrayOutputStream(); InputStream inStream = new FileInputStream(new File(image)); copy(inStream, outStream); inStream.close(); outStream.close(); return outStream.toByteArray(); } public Date getLastModifyTime(String image) { File f = new File(image); return new Date(f.lastModified()); } /* Spring Injected */ private File imageDir; public void setImageDir(String dirName) { imageDir = new File(dirName); } public byte[] getThumbnail(String image) throws IOException { // Open the file, then read it in. ByteArrayOutputStream outStream = new ByteArrayOutputStream(); InputStream inStream = new FileInputStream(new File(image)); copy(inStream, outStream); inStream.close(); outStream.close(); return outStream.toByteArray(); } /** * Copies data from src into dst. */ private void copy(InputStream source, OutputStream destination) throws IOException { try { // Transfer bytes from source to destination byte[] buf = new byte[1024]; int len; while ((len = source.read(buf)) > 0) { destination.write(buf, 0, len); } source.close(); destination.close(); } catch (IOException ioe) { throw ioe; } } private File createImageFile(String image) { File file = new File(imageDir, image); return file; } /** @see ImageService#save(ImageEntry) */ public void save(String image, InputStream imageStream) throws IOException { // Read in the image data. ByteArrayOutputStream baos = new ByteArrayOutputStream(); copy(imageStream, baos); baos.close(); byte[] imageData = baos.toByteArray(); baos = null; // Create a unique name for the file in the image directory and // write the image data into it. File newFile = createImageFile(image); OutputStream outStream = new FileOutputStream(newFile); outStream.write(imageData); outStream.close(); } } /*****************************************************/ ImageResource is setup in init() in the App class like so: /*****************************************************/ public void init() { //create external images resource getSharedResources().add("imageResource", new ImageResource()); } /*****************************************************/ Now, if there's a nicer, cleaner, more simple way of loading external images, I'd really appreciate some suggestions. As for what is now broken, it seems to have something to do w/ the fact that the Wicket Filter is looking at "/*" to find the application because if I use this URL to view an image via my "imageResource" like so: http://localhost/MyApp/resources/wicket.Application/imageResource?file=C:\\Images\\assets\\images\\newsletter\\test_bkg.jpg ...I get a 404 not found. This worked fine when my URL had an alias in Wicket 1.2, i.e. "/products" instead of the "/*" that is used now. If I use "/products" in the URL above, as I would have prior to 1.3 (since I have it listed as a mountable URL in the app class) - it throws an exception saying "java.lang.IllegalStateException: URL fragment has unmatched key/value pair: resources/wicket.Application/imageResource" So, I need help in both areas....one, making this easier, if possible. And, most importantly - being able to restore production and be able to view external images ASAP. Thanks very much in advance!
-- -Wicket for love Nino Martinez Wael Java Specialist @ Jayway DK http://www.jayway.dk +45 2936 7684 --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
