Java GUI中显示网页和HTML返回 [英] Java GUI to display webpages and return HTML

问题描述

我需要一个工作流程如下图所示：

I need a workflow like below:

// 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();

我很惊讶地发现这是多么辛苦与Java的GUI做的，如JavaFX的（的 http://lexandera.com/2009/01/extracting-html-from-a-webview/ ）和Swing。

有一些简单的方法来获得在Java中此功能？

Is there some simple way to get this functionality in Java?

推荐答案

下面是使用JavaFX，打印HTML内容到System.out一个人为的例子 - 它不应该太复杂，以适应创建一个 getHtml（）方法。 （我使用JavaFX 8测试它，但它应该使用JavaFX 2工作太）。

Here is a contrived example using JavaFX that prints the html content to System.out - it should not be too complicated to adapt to create a getHtml() method. (I have tested it with JavaFX 8 but it should work with JavaFX 2 too).

在code将打印HTML内容每次一个新的页面被加载。

The code will print the HTML content everytime a new page is loaded.

请注意：我已经借了从 的PrintDocument code这个答案。

Note: I have borrowed the printDocument code from this answer.

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);
    }
}

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