Question

In my app I display pdf’s using a ByteArrayResource.
This was working fine untill I started working with bigger files. The conversion to ByteArray keeps giving me an out of memory error.

This is how I do it at the moment:

        File myPdf=new File(thePath);
        FileInputStream fin = new FileInputStream(myPdf);
        final byte fileContent[] = new byte[(int)myPdf.length()];
        fin.read(fileContent);
        fin.close();
        ResourceReference rr = new ResourceReference(dePdf.getName()) {

        @Override
        public IResource getResource() {
            return new ByteArrayResource("Application/pdf", fileContent);

        }
        };
        if (rr.canBeRegistered()) {
            getApplication().getResourceReferenceRegistry().registerResourceReference(rr);
        }        

        return wmc;

Is there a better way to display a big file?

Answer 1

Try using ResourceStreamResource and FileResourceStream:

File myPdf=new File(thePath);
FileResourceStream frs = new FileResourceStream(myPdf);

ResourceStreamResource rsr = new ResourceStreamResource(frs);
rsr.setContentDisposition(ContentDisposition.ATTACHMENT);
rsr.setFileName(fileName);

//the same code for resource reference creation and registration
//...