基于 java 或 jwebpane 的 JavaScript 引擎下载链接

Question

我想在我的 java 网络浏览器中添加 javascript 启用窗格。 我听说过 Rhinno、v8 等 javaScript 引擎 但不知道如何使用它。 是否有任何关于他们实现这一点的教程的链接，因为我是 java 中的新手。 或者您能否将下载 JWebPane 的链接发送给我。 谢谢你

Answer 1

听起来您正在编写或修改一个用 Java 编写的 Web 浏览器，它还没有 JavaScript 解释器功能。如果是这样，那么 Rhino 可能是最容易添加它的东西。

Mozilla Rhino examples page 上有很多如何使用它的示例。正如this example 所展示的那样，Rhino 很容易调用：

/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
 *
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 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Rhino code, released
 * May 6, 1998.
 *
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 * Netscape Communications Corporation.
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import org.mozilla.javascript.*;

/**
 * RunScript: simplest example of controlling execution of Rhino.
 *
 * Collects its arguments from the command line, executes the
 * script, and prints the result.
 *
 * @author Norris Boyd
 */
public class RunScript {
    public static void main(String args[])
    {
        // Creates and enters a Context. The Context stores information
        // about the execution environment of a script.
        Context cx = Context.enter();
        try {
            // Initialize the standard objects (Object, Function, etc.)
            // This must be done before scripts can be executed. Returns
            // a scope object that we use in later calls.
            Scriptable scope = cx.initStandardObjects();

            // Collect the arguments into a single string.
            String s = "";
            for (int i=0; i < args.length; i++) {
                s += args[i];
            }

            // Now evaluate the string we've colected.
            Object result = cx.evaluateString(scope, s, "<cmd>", 1, null);

            // Convert the result to a string and print it.
            System.err.println(Context.toString(result));

        } finally {
            // Exit from the context.
            Context.exit();
        }
    }
}

因此，当设置执行网页中包含的 JavaScript 时，您需要将各种环境对象（document 等）添加到 scope 对象，然后使用 evaluateString 对其进行评估。

这将是一项非常重要的任务。如果您还是 Java 新手，我建议您从较小的开始。

Answer 2

使用很简单

public static void main(String[] args) {
   ScriptEngineManager mgr = new ScriptEngineManager();
   ScriptEngine engine = mgr.getEngineByName("JavaScript");
   try {
       engine.eval("print('Hello, world!')");
   } catch (ScriptException ex) {
       ex.printStackTrace();
   }
 }

最好的文档在 Mozilla 的网站http://www.mozilla.org/rhino/doc.html