JavaFX 2.2在javascript和Webview中的双向通信

Question

I am working on JavaFX 2.2, I am using webview to integrate html code in the JavaFX scene and was able to load the html correctly. 我正在使用JavaFX 2.2，正在使用webview在JavaFX场景中集成html代码，并且能够正确加载html。 I was following this link and was trying to pass some objects from javascript to webview/controller but I am getting null values at java side. 我正在跟踪此链接，并试图将一些对象从javascript传递到webview / controller，但在Java端却得到了空值。

I have saved a interface object in JSObject like below 我已经在JSObject中保存了一个接口对象，如下所示

webEngine.getLoadWorker().stateProperty().addListener(
        new ChangeListener<State>() {
            @Override
            public void changed(ObservableValue<? extends State> ov,
                State oldState, State newState) {
                if (newState == State.SUCCEEDED) {
                        JSObject win = (JSObject) webEngine.executeScript("window");
                        win.setMember("app", new JavaApp());
                    }
                }
            }
    );

I have created a class 我创建了一个班

public class JavaApp {

        public void exit() {
           Platform.exit();
        }
        public void print(Date date) {
            System.out.println("Parm:"+date);
         }
        public Date getValue() {
            return new Date();
         }
    }

My html is 我的HTML是

<html lang="en">
<head>
    <script type="text/javascript">
        function callJava(){
            app.print(new Date());
            var val = app.getValue();
            app.print(val);
        }
    </script>
</head>
<body>
<p>Help</p>    
<p><a href="about:blank" onclick="callJava();">Exit the Application</a></p>    
</body>
</html>

In above code I always get null values printed in JavaApp.print() method. 在上面的代码中，我总是在JavaApp.print（）方法中打印出空值。 Interesting point is when I changed the parameter from Date to String in print method and pass the string from javascript, I get correct values. 有趣的一点是，当我在打印方法中将参数从日期更改为字符串并从javascript传递字符串时，我得到了正确的值。

How I can transfer objects in this case especially Date object. 在这种情况下，我如何传输对象，尤其是Date对象。 Any help is much appritiated 任何帮助都值得

Answer 1

Java does not know the Date class of javascript . Java不知道javascript的Date类。

2.3 Data Type Conversions 2.3数据类型转换

You can pass a javascript object to Java , ( you have to wrap it in a JSObject ) but you can get directly only parameters like these: 您可以将javascript对象传递给Java ，（必须将其包装在JSObject ），但是您只能直接获取如下参数：

Numbers , 数字
Boolean , 布尔值
String , 字符串 ，
arrays , 数组
The same object which you have put into javascript before. 这之前已投入 JavaScript中的同一个对象。

My solution for you: 我为您提供的解决方案：

public class JavaApp {

    public void exit() {
       Platform.exit();
    }
    //public void print(Date date) {
    //    System.out.println("Parm:"+date);
    // }
    public void print(long date) {
        System.out.println("Parm:"+new Date(date));
     }
    public Date getValue() {
        return new Date();
     }
}

<html lang="en">
<head>
    <script type="text/javascript">
        function callJava(){
            // app.print(new Date());
            app.print(new Date().getTime());
            var val = app.getValue();
            app.print(val);
        }
    </script>
</head>
<body>
<p>Help</p>    
<p><a href="about:blank" onclick="callJava();">Exit the Application</a></p>    
</body>
</html>

JavaFX 2.2在javascript和Webview中的双向通信

问题描述

1 个解决方案

解决方案1
5 已采纳 2013-02-11 02:21:51

JavaFX 2.2在javascript和Webview中的双向通信

问题描述

1 个解决方案

解决方案1 5 已采纳 2013-02-11 02:21:51

解决方案1
5 已采纳 2013-02-11 02:21:51