Javafx 调用 java 脚本在 webview 中执行 java 函数不起作用

Javafx calling javascript to excute java function in webview not working

根据 JavaFX 文档,您可以使用 JavaScript 函数执行 Java 代码。下面是我的代码:

engine = webview.getEngine();
engine.load("http://localhost:8080/testing.php");
openExcel callback = new openExcel();
JSObject window = (JSObject) engine.executeScript("window");
window.setMember("app", callback);

上面是在初始化方法中,然后对于其他class(openExcel)我有这样的东西:

public class openExcel {

    public void open() {
        if (Desktop.isDesktopSupported()) {
            try {
                File myFile = new File("C:\Users\HP\Desktop\v3.01.xlsm");
                Desktop.getDesktop().open(myFile);
            } catch(IOException ex) {
                System.out.println("Your application is not support");
            }
        }
    }

}

HTML 文件:

<html>
    <head>
        <script>
            function openExcel() {
                app.open();
                alert('hello world');
            }
        </script>
    </head>
    <body>
        <button onclick="openExcel()">Open excel</button>
    </body>

我面临的问题是,当我点击按钮 "openExcel" 时,它什么也没做?我需要帮助!

我已尝试重现您的问题,您的桥似乎正在抛出 error/message 并且您看不到输出。我用你的代码用 JavaScript 消息侦听器创建了一个简单的测试:

public class WebEngineTest extends Application {

    @Override
    public void start(Stage primaryStage) {
        WebConsoleListener.setDefaultListener((webView, message, lineNumber, sourceId) -> {
            System.out.println(message + "[at " + lineNumber + "]");
        });

        WebView webView = new WebView();
        WebEngine engine = webView.getEngine();
        engine.loadContent("<html><head><script>function openExcel() { app.open(); alert('hello world'); } </script></head><body><button onclick=\"openExcel()\">Open excel</button></body></html>");

        JSObject window = (JSObject) engine.executeScript("window");
        window.setMember("app", new OpenExcel());

        Scene scene = new Scene(webView, 300, 150);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public class OpenExcel {

        public void open() {
            if (!Desktop.isDesktopSupported()) {
                throw new RuntimeException("Desktop is not supported");
            }

            try {
                File myFile = new File("C:\Users\HP\Desktop\v3.01.xlsm");
                // File myFile = new File("C:\Users\dzikoysk\Desktop\panda.txt");
                Desktop.getDesktop().open(myFile);
            } catch(IOException ex) {
                System.out.println("Your application is not support");
            }
        }

    }

}

如果我删除 System.out.println(message + "[at " + lineNumber + "]"); 并且文件不存在或桌面不受支持,那么 什么都不会发生 但消息侦听器:

所以我已经将 myFile 更新为 new File("C:\Users\dzikoysk\Desktop\panda.txt");,它存在于我的电脑上,现在一切正常:

无论如何,您的代码中缺少 </html> 标记。在某些较旧版本的 WebEngine 中,它也可能导致问题,请注意此类细节 - 引擎有很多错误且未实现功能。