How to access Java classes (and functions) from Javascript using Rhino JS

Question

I am using Rhino JS for running Javascript on Java, the question, is there a way to access Java classes from Javascript?

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();
        }
}

The code example above is very simplistic, but the idea is how to access the request and response object from within the script? Is it possible?

Example:

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

Beck Yang · Accepted Answer · 2016-06-25 09:00:20Z

1

The ScriptableObject.defineProperty API can define a property in the scope. The javascript access the variable without problem.

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));

answered Jun 25, 2016 at 9:00

Beck Yang

3,0242 gold badges23 silver badges27 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to access Java classes (and functions) from Javascript using Rhino JS

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related