Java GUI显示网页并返回HTML

Question

我需要如下工作流程：

// load xyz.com in the browser window
// the browser is live, meaning users can interact with it
browser.load("http://www.google.com");

// return the HTML of the initially loaded page
String page = browser.getHTML();

// after some time
// user might have navigated to a new page, get HTML again
String newpage = browser.getHTML();

令我惊讶的是，这与Java GUI（例如JavaFX（http://lexandera.com/2009/01/extracting-html-from-
a-webview/
））和Swing 有多么困难。

有一些简单的方法可以在Java中获得此功能吗？

Answer 1

这是一个使用JavaFX的人为示例，该示例将html内容打印到System.out
－适应创建getHtml()方法应该不会太复杂。（我已经用JavaFX 8对其进行了测试，但是它也应该可以与JavaFX 2一起使用）。

每次加载新页面时，该代码都会打印HTML内容。

注意：我已printDocument从此答案中借用了代码。

public class TestFX extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        try {
            final WebView webView = new WebView();
            final WebEngine webEngine = webView.getEngine();

            Scene scene = new Scene(webView);

            stage.setScene(scene);
            stage.setWidth(1200);
            stage.setHeight(600);
            stage.show();

            webEngine.getLoadWorker().stateProperty().addListener(new ChangeListener<Worker.State>() {
                @Override
                public void changed(ObservableValue<? extends State> ov, State t, State t1) {
                    if (t1 == Worker.State.SUCCEEDED) {
                        try {
                            printDocument(webEngine.getDocument(), System.out);
                        } catch (Exception e) { e.printStackTrace(); }
                    }
                }
            });

            webView.getEngine().load("http://www.google.com");

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

    public static void printDocument(Document doc, OutputStream out) throws IOException, TransformerException {
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.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(out, "UTF-8")));
    }

    public static void main(String[] args) {
        launch(args);
    }
}