Rhino conversion java.lang.String to JavaScript String

Question

Context.javaToJS seems to just pass java.lang.Strings straight through.

I am sandboxing the JavaScript (according to http://codeutopia.net/blog/2009/01/02/sandboxing-rhino-in-java/) so java.lang.String is not useable in JavaScript unless I punch holes through the ClassShutter (which I would rather not do).

Am I missing something obvious?

Valijon · Accepted Answer · 2015-07-16 08:36:55Z

1

Try this:

ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("JavaScript");
ScriptContext context = engine.getContext();
context.setAttribute("jsString", "I am Java String", ScriptContext.ENGINE_SCOPE);
context.setAttribute("jsBoolean", true, ScriptContext.ENGINE_SCOPE);
context.setAttribute("jsNumber",  123456, ScriptContext.ENGINE_SCOPE);
engine.eval("function getValueAndType(obj){return obj + ' - ' + typeof obj;}");
Assert.assertEquals("Something wen wrong", "I am Java String - string", engine.eval("getValueAndType(jsString)"));
Assert.assertEquals("Something wen wrong", "true - boolean", engine.eval("getValueAndType(jsBoolean)"));
Assert.assertEquals("Something wen wrong", "123456 - number", engine.eval("getValueAndType(jsNumber)"));

answered Jul 16, 2015 at 8:36

Valijon

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1 Comment

Tuntable Over a year ago

Yes, the setAttributes seems to create js strings, while Context.javaToJS just passes through Java strings. I suppose that I could fudge things that way. But ideally would like returned values. Thanks.

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