如何使用Rhino JS从Javascript访问Java类（和函数）

Question

我正在使用Rhino JS在Java上运行Javascript，问题是，有没有办法从Javascript访问Java类？

public void execute(Request request, Response response){
        String script = "function abc(x,y) {return x+y;}"; // example how to access the request and response object from within the script? 
        Context context = Context.enter();
        try {
            ScriptableObject scope = context.initStandardObjects();
            Scriptable that = context.newObject(scope);
            Function fct = context.compileFunction(scope, script, "script", 1, null);
            Object result = fct.call(context, scope, that, new Object[] { 2, 3 });
            System.out.println(Context.jsToJava(result, int.class));
        }
        finally {
            Context.exit();
        }
}

上面的代码示例非常简单，但是想法是如何从脚本内部访问请求和响应对象？ 可能吗？

例：

function abc(request,response) {
    var body = request.body;
    response.body = body;
    return response;
}

Answer 1

ScriptableObject.defineProperty API可以在范围中定义属性。 javascript可以毫无问题地访问变量。

ScriptableObject scope = context.initStandardObjects();
Scriptable that = context.newObject(scope);
scope.defineProperty("req", request, ScriptableObject.READONLY);
scope.defineProperty("res", response, ScriptableObject.READONLY);
Object result = context.evaluateString(that, "function abc(request,response) {return response.body;}\n abc(req, res)", "script", 1, null);
System.out.println(Context.jsToJava(result, String.class));