如何使用Wicket的DownloadLink与动态生成的文件？

public class MyResource implements IResource {
    private byte[] data;

    public MyResource(byte[] data) {
        this.data = data;
    }

    @Override
    public InputStream getData() {
        return new ByteArrayInputStream(data);
    }

    @Override
    public String getContentType() {
        return "application/octet-stream";
    }
}

public class MyResourceLink implements IResourceLink {
    private IResource resource;

    public MyResourceLink(IResource resource) {
        this.resource = resource;
    }

    @Override
    public IResource getResource() {
        return resource;
    }
}

public class MyPage extends WebPage {
    public MyPage() {
        byte[] data = new byte[]{1, 2, 3, 4, 5};
        IResource resource = new MyResource(data);
        IResourceLink resourceLink = new MyResourceLink(resource);
        DownloadLink downloadLink = new DownloadLink("download", resourceLink) {
            @Override
            public void onDownload() {
                IResource resource = getResourceLink().getResource();
                HttpServletResponse response = (HttpServletResponse) getResponse().getContainerResponse();
                response.setContentType(resource.getContentType());
                try (InputStream input = resource.getData()) {
                    IOUtils.copy(input, response.getOutputStream());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        };
        add(downloadLink);
    }
}