FileDownload is used to stream binary contents like files stored in database to the client. FileDownload is used by attaching it to any JSF command component like button or a link. Additionally presentation of download can be configured with the contentDisposition attribute that takes either "attachment" or "inline" as a value.
<p:commandLink id="downloadLink" value="Download" ajax="false">
<p:fileDownload value="#{fileDownloadController.file}" />
</p:commandLink>
package org.primefaces.examples.view;
import java.io.InputStream;
import javax.faces.context.FacesContext;
import javax.servlet.ServletContext;
import org.primefaces.model.DefaultStreamedContent;
import org.primefaces.model.StreamedContent;
public class FileDownloadController {
private StreamedContent file;
public FileDownloadController() {
InputStream stream = ((ServletContext)FacesContext.getCurrentInstance().getExternalContext().getContext()).getResourceAsStream("/images/optimusprime.jpg");
file = new DefaultStreamedContent(stream, "image/jpg", "downloaded_optimus.jpg");
}
public StreamedContent getFile() {
return file;
}
}
Running PrimeFaces-3.3-SNAPSHOT on Mojarra-2.1.7