How can I use JavaScript in Java? [closed]

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?

Solution 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.

Solution 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.
  }
}

Solution 3:

You can use ScriptEngine, example:

public class Main {
    public static void main(String[] args) {
        StringBuffer javascript = null;
        ScriptEngine runtime = null;

        try {
            runtime = new ScriptEngineManager().getEngineByName("javascript");
            javascript = new StringBuffer();

            javascript.append("1 + 1");

            double result = (Double) runtime.eval(javascript.toString());

            System.out.println("Result: " + result);
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }
}