Nashorn - JS引擎

ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
        engine.eval("print(‘hello‘);"); // execute js from source
        File f = new File("resources/scripts.js");
        engine.eval(new FileReader(f)); // execute js from file

function add(a, b) {
    return a + b;
}

var f1 = function(name) {
    print("JS: " + name);
    return "Greeting from JS";
}
var f2 = function(obj) {
    print("JS Class: " + Object.prototype.toString.call(obj));
}

        ScriptEngine engine = new ScriptEngineManager()
                .getEngineByName("nashorn");
        engine.eval("print(‘hello‘);"); // execute js from source
        File f = new File("resources/scripts.js");
        engine.eval(new FileReader(f)); // execute js from file
        Invocable invocable = (Invocable) engine;
        Object sum = invocable.invokeFunction("add", 1, 2);
        System.out.println(sum);
        invocable.invokeFunction("f2", new Date());
        invocable.invokeFunction("f2", LocalDateTime.now());            

    public static String greeting(String name) {
        System.out.println("From Java " + name);
        return "From Java";
    }

    public static void getCls(Object obj) {
        System.out.println(obj.getClass());
    }

     ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
     File f = new File("resources/scripts.js");
     engine.eval(new FileReader(f)); // execute js from file

var cls = Java.type("nashorn.NashornTest");
print(cls.greeting(‘Zhijie‘));

cls.getCls(123);
//class java.lang.Integer

cls.getCls(49.99);
//class java.lang.Double

cls.getCls(true);
//class java.lang.Boolean

cls.getCls("hi there")
//class java.lang.String

cls.getCls(new Number(23));
//class jdk.nashorn.internal.objects.NativeNumber

cls.getCls(new Date());
//class jdk.nashorn.internal.objects.NativeDate

cls.getCls(new RegExp());
//class jdk.nashorn.internal.objects.NativeRegExp

cls.getCls({foo: ‘bar‘});
//class jdk.nashorn.internal.scripts.JO4

    
    public static void f(ScriptObjectMirror mirror) {
        System.out.println(mirror.getClassName() + ": " +
            Arrays.toString(mirror.getOwnKeys(true)));
    }
    
    public static void callMethodOfJSObject(ScriptObjectMirror person) {
        System.out.println("Full Name is: " + person.callMember("getFullName"));
    }

cls.f({a:‘a‘,b:‘b‘});

function Person(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.getFullName = function() {
        return this.firstName + " " + this.lastName;
    }
}

var person1 = new Person("Zhijie", "Liu");
cls.callMethodOfJSObject(person1);