How can I use JavaScript in Java? [closed]

Question

I wanted to build a small product in which I wanted to give a kind of feature in which user can write a script language kind of JavaScript.

And also from JavaScript able to build objects and calling methods on them.

Is there any framework for this?

Answer 1

Rhino is what you are looking for.

Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

Update: Now Nashorn, which is more performant JavaScript Engine for Java, is available with jdk8.

Answer 2

Java includes a scripting language extension package starting with version 6.

See the Rhino project documentation for embedding a JavaScript interpreter in Java.

[Edit]

Here is a small example of how you can expose Java objects to your interpreted script:

public class JS {   public static void main(String args[]) throws Exception {     ScriptEngine js = new ScriptEngineManager().getEngineByName("javascript");     Bindings bindings = js.getBindings(ScriptContext.ENGINE_SCOPE);     bindings.put("stdout", System.out);     js.eval("stdout.println(Math.cos(Math.PI));");     // Prints "-1.0" to the standard output stream.   } }