Download File

Use a StreamResource and FileDownloader. Wiki article written for 7.0.0 https://vaadin.com/wiki/-/wiki/Main/Letting+the+user+download+a+file
About resources in book of Vaadin https://vaadin.com/book/-/page/application.resources.html#application.resources.stream

Also I have to mention that the popular Viritin add-on has a DownloadButton, that does some of the work for you.

It's com.vaadin.server.FileDownloader available in vaadin-server jar. There since 7.0.0. Are you using Vaadin 6 or 7?

Johannes Häyry: It's com.vaadin.server.FileDownloader available in vaadin-server jar. There since 7.0.0. Are you using Vaadin 6 or 7?

There is not com.vaadin.server package, and I'm using 6.8.4v
 

Hi
Works fine for 6.8.16.

Wrapper class:

public class MyStreamResource extends StreamResource {

    private static final long serialVersionUID = 1;
    private DownloadStream downloadStream;

    public MyStreamResource(StreamSource streamSource, String filename, Application application) {
        super(streamSource, filename, application);
    }

    @Override
    public DownloadStream getStream() {
        final StreamSource streamSource = getStreamSource();
        if (streamSource == null) {
            return null;
        }
        if (downloadStream == null) {
            downloadStream = new DownloadStream(streamSource.getStream(), getMIMEType(), getFilename());
            downloadStream.setBufferSize(getBufferSize());
            downloadStream.setCacheTime(getCacheTime());
        }
        return downloadStream;
    }
}

Use:

StreamResource resource = new MyStreamResource(new StreamResource.StreamSource() {
     private static final long serialVersionUID = 1L;

     @Override
     public InputStream getStream() {
         InputStream fis = null;
         try {
             fis = <You input stream>
         } catch (FileNotFoundException ex) {
             log.error("Error getting file", ex);
         }
         return fis;
     }
}, "myfile", getApplication());
resource.setMIMEType("application/octet-stream");
resource.setCacheTime(0);
resource.getStream().setParameter("Content-Disposition", "attachment;filename=\"" + "myfile" + "\"");
resource.getStream().setParameter("Content-Transfer-Encoding", "binary");
getMainWindow().open(resource, "_self");

Andris Lapinsh: Hi
Works fine for 6.8.16.

Wrapper class:

public class MyStreamResource extends StreamResource {

    private static final long serialVersionUID = 1;
    private DownloadStream downloadStream;

    public MyStreamResource(StreamSource streamSource, String filename, Application application) {
        super(streamSource, filename, application);
    }

    @Override
    public DownloadStream getStream() {
        final StreamSource streamSource = getStreamSource();
        if (streamSource == null) {
            return null;
        }
        if (downloadStream == null) {
            downloadStream = new DownloadStream(streamSource.getStream(), getMIMEType(), getFilename());
            downloadStream.setBufferSize(getBufferSize());
            downloadStream.setCacheTime(getCacheTime());
        }
        return downloadStream;
    }
}

Use:

StreamResource resource = new MyStreamResource(new StreamResource.StreamSource() {
     private static final long serialVersionUID = 1L;

     @Override
     public InputStream getStream() {
         InputStream fis = null;
         try {
             fis = <You input stream>
         } catch (FileNotFoundException ex) {
             log.error("Error getting file", ex);
         }
         return fis;
     }
}, "myfile", getApplication());
resource.setMIMEType("application/octet-stream");
resource.setCacheTime(0);
resource.getStream().setParameter("Content-Disposition", "attachment;filename=\"" + "myfile" + "\"");
resource.getStream().setParameter("Content-Transfer-Encoding", "binary");
getMainWindow().open(resource, "_self");

 

Thanks it's working :D

Why are you using vaadin 6? It's only a matter of curiosity :p

I suspect that it is necessary to maintain the old project or move to the latest version is too expensive in time and money :)

Jon Inazio Sánchez Martínez: Why are you using vaadin 6? It's only a matter of curiosity :p

It was started already, I'm just fixing some sh*t overhere, who left my cowerker, now ex-coworker :P  
Btw I don't know how to upgrade to lates version, and I'm not sure if it will works again if I upgrade it.
I'm scared of getting lot of errors :D