java - 如何在vaadin中设置图像数据源

Question

我有一个水平分割面板，我想在其中显示组合框中选择的图像，但无法设置图像文件的数据源。

FilesystemContainer container = new FilesystemContainer(new File("C:/myData/wallpaper"));
ComboBox box = new ComboBox("Documents", container);


@Override
    protected void init(VaadinRequest request) {
        setContent(box);

        com.vaadin.ui.HorizontalSplitPanel horizontalSplitPanel = new com.vaadin.ui.HorizontalSplitPanel();
        setContent(horizontalSplitPanel);
        horizontalSplitPanel.addComponent(box);
        //horizontalSplitPanel.addComponent(label);
        final Image image = new Image();
        horizontalSplitPanel.addComponent(image);
        box.addValueChangeListener(new ValueChangeListener() {

            @Override
            public void valueChange(ValueChangeEvent event) {
                image.setData(event.getProperty().getValue());
                ///label.set//setPropertyDataSource( (Property) ImageIO.read((ImageInputStream) new TextFileProperty((File) event.getProperty().getValue())));

            }
        });

        box.setImmediate(true);

如何设置图像的数据源。我是 Vaadin 的新手。

Answer 1

我建议这样:

@Override
public void valueChange(ValueChangeEvent event) {
    image.setSource(new FileResource((File)box.getValue()));
}