JavaFX 8 WebEngine:如何在Java中将console.log()从javascript获取到System.out? [英] JavaFX 8 WebEngine: How to get console.log() from javascript to System.out in java?

问题描述

我同时使用JavaFX和JavaFX WebEngine中的javascript引擎来开发应用程序.我想从JavaScript中获取反馈信息以进行调试. WebEngine内的控制台输出会怎样?有什么方法可以访问它，或在Java中重定向到System.out?

I'm using both JavaFX and the javascript engine inside JavaFX WebEngine to develop an application. I'd like to get feedback from javascript for debugging purposes. What happens to the console output inside the WebEngine? Is there any way I can access it, or redirect to System.out in java?

推荐答案

以下代码将console.log()重定向到JavaBridge.log():

import netscape.javascript.JSObject;

[...]

public class JavaBridge
{
    public void log(String text)
    {
        System.out.println(text);
    }
}

// Maintain a strong reference to prevent garbage collection:
// https://bugs.openjdk.java.net/browse/JDK-8154127
private final JavaBridge bridge = new JavaBridge();

[...]

webEngine.getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) ->
{
    JSObject window = (JSObject) webEngine.executeScript("window");
    window.setMember("java", bridge);
    webEngine.executeScript("console.log = function(message)\n" +
        "{\n" +
        "    java.log(message);\n" +
        "};");
});

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