JSF file upload on GAE - google-app-engine

Question

I'm trying to have a file upload element in my JSF over Google App Engine.
I have browsed the web for several alternatives but none seem to work with GAE.
I was able to do so using JSP and servlet with BlobstoreService but couldn't find a way to make it working with JSF.
As a workaround I was trying to see if there is a way to include a JSP within a JSF but I guess this isn't doable as well.
Would be thankful to get a working example.
Thanks!

Answer 1

First get library http://code.google.com/p/gmultipart/ and add to your project.
And than override class org.primefaces.webapp.filter.FileUploadFilter (just put in your src).
There is code of class org.primefaces.webapp.filter.FileUploadFilter:
package org.primefaces.webapp.filter;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.gmr.web.multipart.GFileItemFactory;
import org.primefaces.webapp.MultipartRequest;
public class FileUploadFilter implements Filter {
private final static Logger logger = Logger.getLogger(FileUploadFilter.class.getName());
private final static String THRESHOLD_SIZE_PARAM = "thresholdSize";
private final static String UPLOAD_DIRECTORY_PARAM = "uploadDirectory";
private String thresholdSize;
private String uploadDir;
public void init(FilterConfig filterConfig) throws ServletException {
thresholdSize = filterConfig.getInitParameter(THRESHOLD_SIZE_PARAM);
uploadDir = filterConfig.getInitParameter(UPLOAD_DIRECTORY_PARAM);
if(logger.isLoggable(Level.FINE))
logger.fine("FileUploadFilter initiated successfully");
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
boolean isMultipart = ServletFileUpload.isMultipartContent(httpServletRequest);
if(isMultipart) {
if(logger.isLoggable(Level.FINE))
logger.fine("Parsing file upload request");
//start change
FileItemFactory diskFileItemFactory = new GFileItemFactory();
/* if(thresholdSize != null) {
diskFileItemFactory.setSizeThreshold(Integer.valueOf(thresholdSize));
}
if(uploadDir != null) {
diskFileItemFactory.setRepository(new File(uploadDir));
}*/
//end change
ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
MultipartRequest multipartRequest = new MultipartRequest(httpServletRequest, servletFileUpload);
if(logger.isLoggable(Level.FINE))
logger.fine("File upload request parsed succesfully, continuing with filter chain with a wrapped multipart request");
filterChain.doFilter(multipartRequest, response);
} else {
filterChain.doFilter(request, response);
}
}
public void destroy() {
if(logger.isLoggable(Level.FINE))
logger.fine("Destroying FileUploadFilter");
}
}
In managed bean write method like:
public void handleFileUpload(FileUploadEvent event) {
UploadedFile uploadedFile = event.getFile();
try {
String blobKey = BlobUtils.uploadImageToBlobStore(uploadedFile.getContentType(), uploadedFile.getFileName(), uploadedFile.getContents());
this.iconKey = blobKey;
} catch (IOException e) {
log.log(Level.SEVERE, "Ошибка при попытке загрузить файл в blob-хранилище", e);
FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_ERROR, "Ошибка при попытке загрузить файл", event.getFile().getFileName() + " не загружен!");
FacesContext.getCurrentInstance().addMessage(null, msg);
return;
}
FacesMessage msg = new FacesMessage("Успешно.", event.getFile().getFileName() + " загружен.");
FacesContext.getCurrentInstance().addMessage(null, msg);
}
And that all.

Answer 2

First of all , I think that whatever you are doing with JSP should eventually work with JSF as well..
BUT,
If you are looking for a file upload component for JSF , that works on GAE ,
take a look at the PrimeFaces FileUpload
Here is another link that got an explanation on what to do in order it to work on GAE :Primefaces File Upload Filter
(haven't tried it myself...)