使用 javafx 从 webview 获取内容

问题描述

我正在使用 JAVA FX 控件开发 Swing 应用程序.在我的应用程序中，我必须打印出 webview 中显示的 html 页面.我正在尝试的是在 HtmlDocuement 的帮助下将 webview 的 html 内容加载到字符串中.

I am working on a swing application using JAVA FX controls . In my application i have to take print out the html page displayed in the webview . What I am trying is to load the html content of webview in a string with the help of HtmlDocuement.

要从 Web 视图加载 html 文件的内容，我正在使用以下代码但它不起作用:

To load the content of html file from web view,I am using the following code but its not working:

try
{
    String str=webview1.getEngine().getDocment().Body().outerHtml();
}
catch(Exception ex)
{
}

推荐答案

WebEngine.getDocument 返回 org.w3c.dom.Document，而不是您期望判断的 JavaScript 文档通过你的代码.

WebEngine.getDocument returns org.w3c.dom.Document, not JavaScript document which you expect judging by your code.

不幸的是，打印org.w3c.dom.Document 需要大量的编码.您可以尝试 中的解决方案将 org.w3c.dom.Document 漂亮地打印到标准输出的最短方法是什么?，请参阅下面的代码.

Unfortunately, printing out org.w3c.dom.Document requires quite a bit of coding. You can try the solution from What is the shortest way to pretty print a org.w3c.dom.Document to stdout?, see code below.

请注意，在使用Document 之前，您需要等到文档加载完毕.这就是这里使用 LoadWorker 的原因:

Note that you need to wait until the document is loaded before working with Document. This is why LoadWorker is used here:

public void start(Stage primaryStage) {
    WebView webview = new WebView();
    final WebEngine webengine = webview.getEngine();
    webengine.getLoadWorker().stateProperty().addListener(
            new ChangeListener<State>() {
                public void changed(ObservableValue ov, State oldState, State newState) {
                    if (newState == Worker.State.SUCCEEDED) {
                        Document doc = webengine.getDocument();
                        try {
                            Transformer transformer = TransformerFactory.newInstance().newTransformer();
                            transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
                            transformer.setOutputProperty(OutputKeys.METHOD, "xml");
                            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
                            transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
                            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");

                            transformer.transform(new DOMSource(doc),
                                    new StreamResult(new OutputStreamWriter(System.out, "UTF-8")));
                        } catch (Exception ex) {
                            ex.printStackTrace();
                        }
                    }
                }
            });
    webengine.load("http://stackoverflow.com");
    primaryStage.setScene(new Scene(webview, 800, 800));
    primaryStage.show();
}

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