Question

When I Implement primefaces FileDownload Class which is in Primefaces UserGuide at this point my IDE showing set method return type to void or change to constructor.

public FileDownloadController()

public class FileBean {

private StreamedContent file;

public FileDownloadController() {
InputStream stream = this.getClass().getResourceAsStream("yourfile.pdf");
file = new DefaultStreamedContent(stream, "application/pdf",
"downloaded_file.pdf");
}
public StreamedContent getFile() {
return this.file;
}
}

what is the exact problem.

Answer 1

change your code to like this..

package org.primefaces.examples.view;

 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;
}  
}