如果我将我的 class 之一的对象绑定到脚本引擎，我如何才能通过脚本引擎将其作为 class 的对象访问？

Question

我希望能够通过 put() 将对象传递到 ScriptEngine 并能够从脚本引擎中访问其属性和方法。

例如

public class MyClass {
    String getName() { return "abc"; }
}

MyClass my = new MyClass();
engine.put("abc", my);

我该怎么做？

Answer 1

这是 JavaScript 的完整工作示例。正如我在评论中提到的，您必须确保您的方法是 public.

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class JavaScriptEngineSample {

    public static class MyClass {
        private String name;

        public String getName() { return name; }
        public void setName(final String name) { this.name = name; }
    }

    public static void main(final String[] args) throws ScriptException {
        final MyClass my = new MyClass();
        my.setName("Input");

        final ScriptEngineManager factory = new ScriptEngineManager();

        // you could also use 'javascript' here, I'm using 'nashorn' to visualize that I'm using the new Java 8 Engine
        final ScriptEngine engine = factory.getEngineByName("nashorn");

        engine.put("my", my);

        String script = "java.lang.System.out.println(my.getName());";
        script += "my.setName('Output');";

        engine.eval(script);

        System.out.println(my.getName());
    }
}

如果我将我的 class 之一的对象绑定到脚本引擎，我如何才能通过脚本引擎将其作为 class 的对象访问？

If I bind an object of one of my classes to a scripting engine, how can I access it as an object of that class from withing the scripting engine?

java

scripting

java-scripting-engine