如何使用 Apache Rhino 调用子属性函数

Question

如果我有一个如下所示的 js 对象存储在 js 文件中，

var _sampleProcessor = {
    process: function(data){
        ...
    }

}

我将如何使用 Apache Rhino 来调用 process 函数？

// sb holds the contents of the js file
Context cx = Context.enter();
Scriptable scope = cx.initStandardObjects();
cx.evaluateString(scope, sb.toString(), "Test", 1, null);

Object processor = scope.get("sampleProcessor ", scope);
if (processor  == Scriptable.NOT_FOUND) {
    System.out.println("processor  is not defined.");
}

到达对象的根很容易，但是我如何遍历对象树以获取过程函数属性

提前致谢

Answer 1

该示例做了一些事情。像您的示例一样提取 sampleProcessor，并且还提取 process 属性并执行该函数。

它还展示了将 Java 对象添加到作用域中以便可以使用它们 - 示例中的 System.out 对象。

package grimbo.test.rhino;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;

public class InvokeFunction {
    public static void main(String[] args) {
        String sb = "var sampleProcessor = {\n" + "    process: function(data){\n    out.println(0); return 1+1;\n    }\n" + "}";

        Context cx = Context.enter();
        Scriptable scope = cx.initStandardObjects();

        Object out = Context.javaToJS(System.out, scope);
        ScriptableObject.putProperty(scope, "out", out);

        cx.evaluateString(scope, sb.toString(), "Test", 1, null);

        // get the sampleProcessor object as a Scriptable
        Scriptable processor = (Scriptable) scope.get("sampleProcessor", scope);
        System.out.println(processor);

        // get the process function as a Function object
        Function processFunction = (Function) processor.get("process", processor);
        System.out.println(processFunction);

        // execute the process function
        Object ob = cx.evaluateString(scope, "sampleProcessor.process()", "Execute process", 1, null);
        System.out.println(ob);
    }
}

输出：

[object Object]
org.mozilla.javascript.gen.Test_1@b169f8
0.0
2