Form component that corresponds to a <input type="file">. When a FileInput component is nested in a {@link org.apache.wicket.markup.html.form.Form}, that has multipart == true, its model is updated with the {@link org.apache.wicket.markup.html.form.upload.FileUpload}for this component.
NOTEThe model of this component is reset with {@code null} at the end of therequest because {@link FileUpload} instances do not survive across requests since the inputstreams they point to will be closed. Because of this, the {@link FileUpload} instance should beprocessed within the same request as the form containing it was submitted.
@author Eelco Hillenius