JavaFX - 如何将字符串从 'webEngine createWebEngine(Stage stage)' 显示到其他类中的 Pane

Question

我正在尝试将下面代码中的字符串显示到其他类中的 Pane 。

public WebEngine helloWebEngine(Stage stage) {

    WebView wv = getWebView();
    webEngine = wv.getEngine();

    webEngine.getLoadWorker().stateProperty().addListener(new ChangeListener<State>() {
        @Override
        public void changed(ObservableValue<? extends State> ov, State oldState, State newState) {
            if (newState == Worker.State.RUNNING) {  
                stage.setTitle(webEngine.getLocation());


                 try {
                      TransformerFactory transformerFactory = TransformerFactory
                          .newInstance();
                      Transformer transformer = transformerFactory.newTransformer();
                      StringWriter stringWriter = new StringWriter();
                      transformer.transform(new DOMSource(webEngine.getDocument()),
                          new StreamResult(stringWriter));
                      String xml = stringWriter.getBuffer().toString();
                      System.out.println(xml);



                    } catch (Exception e) {
                      e.printStackTrace();
                    }
            }
        }
    });
    return webEngine;

所以，代码中有字符串“xml”。当然，我可以在控制台中打印。但我想在另一个类的 Pane 上显示。我尝试使用 Text 对象通过 setText(xml) 和 getText() 来保存 String，但它对我不起作用，或者我使用了错误的方式。

你对此有什么想法吗？谢谢。

Answer 1

如果这是在某个类中，例如 WebViewTransformer(您可能可以选择更好的名称)，请向该类添加一个 StringProperty 并从处理程序中设置它:

public class WebViewTransformer {

    private final StringProperty xml = new SimpleStringProperty();

    public StringProperty xmlProperty() {
        return xml ;
    }

    public final String getXml() {
        return xmlProperty().get();
    }

    public final void setXml(String xml) {
        xmlProperty().set(xml);
    }

    // not really sure why this takes a stage as parameter....
    public WebEngine helloWebEngine(Stage stage) {

        WebView wv = getWebView();
        webEngine = wv.getEngine();

        webEngine.getLoadWorker().stateProperty().addListener(new ChangeListener<State>() {
            @Override
            public void changed(ObservableValue<? extends State> ov, State oldState, State newState) {
                if (newState == Worker.State.RUNNING) {  
                    stage.setTitle(webEngine.getLocation());


                     try {
                          TransformerFactory transformerFactory = TransformerFactory
                              .newInstance();
                          Transformer transformer = transformerFactory.newTransformer();
                          StringWriter stringWriter = new StringWriter();
                          transformer.transform(new DOMSource(webEngine.getDocument()),
                              new StreamResult(stringWriter));
                          String xml = stringWriter.getBuffer().toString();


                          setXml(xml);



                        } catch (Exception e) {
                          e.printStackTrace();
                        }
                }
            }
        });
        return webEngine;
    }

}

现在你只需要做

WebViewTransformer transformer = new WebViewTransformer() ;
transformer.xmlProperty().addListener((obs, oldXML, newXML) -> {
    // display newXML wherever you need...
});
WebEngine engine = transformer.helloWebEngine(primaryStage);