检测WebView中的超链接hover并打印链接

我想从WebView添加hover的超链接并将其显示在角落中。

我怎样才能实现？ 它应该像Chromesfunction：

实施例 – 铬 – 截图

带有许多链接的示例WebView代码：

import javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.ScrollPane; import javafx.scene.web.WebEngine; import javafx.scene.web.WebView; import javafx.stage.Stage; public class core extends Application { @Override public void start(final Stage stage) { Scene scene = new Scene(new Group()); final WebView browser = new WebView(); final WebEngine webEngine = browser.getEngine(); ScrollPane scrollPane = new ScrollPane(); scrollPane.setContent(browser); webEngine.load("http://java2s.com"); scene.setRoot(scrollPane); stage.setScene(scene); stage.show(); } public static void main(String[] args) { launch(args); } } 

Answer 1

首先 – 你的Scene应该包含多个元素，而不仅仅是ScrollPane 。 你需要一个TextField来显示超链接的内容，这两个Control应该放在某种窗格上。 要在鼠标经过超链接时处理显示内容，您需要获取所有超链接类型的节点，然后为它们添加适当的侦听器。

看看下面的代码，它可以实现您想要实现的目标（它部分基于’灵感和表达’博客中的’JavaFX WebView addHyperlinkListener’文章 ）：

 public class Main extends Application { @Override public void start(final Stage stage) { Scene scene = new Scene(new Group()); final WebView browser = new WebView(); final WebEngine webEngine = browser.getEngine(); ScrollPane scrollPane = new ScrollPane(); scrollPane.setContent(browser); TextField textField = new TextField(); textField.setVisible(false); textField.setEditable(false); webEngine.getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) -> { if (newValue == Worker.State.SUCCEEDED) { EventListener mouseOverEventListener = new EventListener() { @Override public void handleEvent(Event ev) { String href = ((Element) ev.getTarget()).getAttribute("href"); textField.setText(href); textField.setVisible(true); textField.setPrefWidth(textField.getText().length() * 6); // System.out.println(href); } }; EventListener mouseOutEventListener = new EventListener() { @Override public void handleEvent(Event ev) { textField.setVisible(false); } }; Document document = webEngine.getDocument(); NodeList nodeList = document.getElementsByTagName("a"); for (int i = 0 ; i < nodeList.getLength() ; i++) { ((EventTarget) nodeList.item(i)).addEventListener("mouseover",mouseOverEventListener,false); ((EventTarget) nodeList.item(i)).addEventListener("mouseout",mouseOutEventListener,false); } } }); String content = "http://java2s.com"; webEngine.load(content); AnchorPane anchorPane = new AnchorPane(); anchorPane.getChildren().add(scrollPane); anchorPane.getChildren().add(textField); AnchorPane.setBottomAnchor(textField, 0.0); AnchorPane.setLeftAnchor(textField, 0.0); scene.setRoot(anchorPane); stage.setScene(scene); stage.show(); } public static void main(String[] args) { launch(args); } } 

Answer 2

我是如何显示所有元素的链接的完整示例：

 import org.w3c.dom.Document; import org.w3c.dom.NodeList; import org.w3c.dom.events.Event; import org.w3c.dom.events.EventListener; import org.w3c.dom.events.EventTarget; import org.w3c.dom.html.HTMLIFrameElement; import org.w3c.dom.Element; import javafx.application.Application; import javafx.concurrent.Worker; import javafx.scene.Scene; import javafx.scene.control.Label; import javafx.scene.control.TextField; import javafx.scene.layout.AnchorPane; import javafx.scene.layout.BorderPane; import javafx.scene.web.WebEngine; import javafx.scene.web.WebView; import javafx.stage.Stage; public class getWeblinksInCorner extends Application { EventListener mouseOverEventListener; EventListener mouseOutEventListener; @Override public void start(final Stage stage) { final WebView browser = new WebView(); Label textField = new Label(); final WebEngine webEngine = browser.getEngine(); textField.setVisible(false); webEngine.getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) -> { if (newValue == Worker.State.SUCCEEDED) { mouseOverEventListener = new EventListener() { @Override public void handleEvent(Event ev) { String href = getNextHref((Element) ev.getTarget()); if (href != null && !href.isEmpty()) { if (href.startsWith("/")) { href = ((Element) ev.getTarget()).getBaseURI() + href; } textField.setText(href + " "); textField.setPrefHeight(22); textField.setMaxWidth(650); textField.setStyle("-fx-border-color: #C6C6C7; -fx-background-color: #F2F2F2;"); textField.setVisible(true); } } private String getNextHref(Element target) { while (target.getAttribute("href") == null) { if (target.toString().contains("HTMLHtmlElement")) { return ""; } target = (Element) target.getParentNode(); if (target == null) { return ""; } } return target.getAttribute("href"); } }; mouseOutEventListener = new EventListener() { @Override public void handleEvent(Event ev) { textField.setVisible(false); } }; Document document = webEngine.getDocument(); addListener(document.getElementsByTagName("*")); } }); String content = "http://java2s.com"; webEngine.load(content); TextField tf = new TextField(); tf.textProperty().bind(webEngine.locationProperty()); BorderPane pane = new BorderPane(); AnchorPane ap = new AnchorPane(browser, textField); AnchorPane.setBottomAnchor(browser, 0.0); AnchorPane.setLeftAnchor(browser, 0.0); AnchorPane.setTopAnchor(browser, 0.0); AnchorPane.setRightAnchor(browser, 0.0); AnchorPane.setBottomAnchor(textField, 0.0); AnchorPane.setLeftAnchor(textField, 0.0); pane.setCenter(ap); pane.setTop(tf); Scene scene = new Scene(pane); stage.setScene(scene); stage.show(); } private void addListener(NodeList nodeList) { for (int i = 0; i < nodeList.getLength(); i++) { try { HTMLIFrameElement iFrame = ((HTMLIFrameElement) nodeList.item(i)); addListener(iFrame.getContentDocument().getElementsByTagName("*")); } catch (Exception e) { Element el = (Element) nodeList.item(i); while (!el.toString().contains("HTMLHtmlElement")) { el = (Element) el.getParentNode(); ((EventTarget) el).removeEventListener("mouseover", mouseOverEventListener, false); ((EventTarget) el).removeEventListener("mouseout", mouseOutEventListener, false); } ((EventTarget) nodeList.item(i)).addEventListener("mouseover", mouseOverEventListener, false); ((EventTarget) nodeList.item(i)).addEventListener("mouseout", mouseOutEventListener, false); } } } public static void main(String[] args) { launch(args); } }