如何使用Rhino JS從Javascript訪問Java類（和函數）

Question

我正在使用Rhino JS在Java上運行Javascript，問題是，有沒有辦法從Javascript訪問Java類？

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();
        }
}

上面的代碼示例非常簡單，但是想法是如何從腳本內部訪問請求和響應對象？ 可能嗎？

例：

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

Answer 1

ScriptableObject.defineProperty API可以在范圍中定義屬性。 javascript可以毫無問題地訪問變量。

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));