Example usage for javax.script ScriptEngineManager getEngineByName

Introduction

In this page you can find the example usage for javax.script ScriptEngineManager getEngineByName.

Prototype

public ScriptEngine getEngineByName(String shortName)

Source Link

Document

Looks up and creates a ScriptEngine for a given name.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");

    if (!(engine instanceof Compilable)) {
        System.out.println("Script compilation not supported.");
        return;/*  w  w w  . ja  va2 s . co m*/
    }
    Compilable comp = (Compilable) engine;

    CompiledScript cScript = comp.compile("print(n1 + n2)");

    Bindings scriptParams = engine.createBindings();
    scriptParams.put("n1", 2);
    scriptParams.put("n2", 3);
    cScript.eval(scriptParams);

    scriptParams.put("n1", 9);
    scriptParams.put("n2", 7);
    cScript.eval(scriptParams);
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");

    if (!(engine instanceof Invocable)) {
        System.out.println("Interface implementation in script" + "is not supported.");
        return;//from  w  w w  . j a va 2 s  .  c o m
    }
    Invocable inv = (Invocable) engine;
    String scriptPath = "c:/Java_Dev/cal.js";
    engine.eval("load('" + scriptPath + "')");
    Calculator calc = inv.getInterface(Calculator.class);
    if (calc == null) {
        System.err.println("Calculator interface " + "implementation not found.");
        return;
    }
    double x = 2.0;
    double y = 1.0;
    double addResult = calc.add(x, y);

    System.out.println(addResult);
}

From source file:RunJavaScript.java

public static void main(String args[]) {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("javascript");
    try {/*from   ww  w.ja  va 2s. c  o m*/
        Double hour = (Double) engine.eval("var date = new Date();" + "date.getHours();");
        String msg;
        if (hour < 10) {
            msg = "Good morning";
        } else if (hour < 16) {
            msg = "Good afternoon";
        } else if (hour < 20) {
            msg = "Good evening";
        } else {
            msg = "Good night";
        }
        System.out.println(hour);
        System.out.println(msg);
    } catch (ScriptException e) {
        System.err.println(e);
    }
}

From source file:Main.java

public static void main(String[] args) {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("js");
    engine.put("a", 1);
    engine.put("b", 5);

    Bindings bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE);
    Object a = bindings.get("a");
    Object b = bindings.get("b");
    System.out.println("a = " + a);
    System.out.println("b = " + b);

    Object result;/*from  w w  w . ja  v a 2 s . c  om*/
    try {
        result = engine.eval("c = aaaa + bbbb;");
        System.out.println("a + b = " + result);
    } catch (ScriptException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

From source file:TestCompilationSpeed.java

public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");

    String fact = "function fact (n){if (n == 0)return 1; else return n*fact (n-1);};";

    long time = System.currentTimeMillis();
    for (int i = 0; i < MAX_ITERATIONS; i++)
        engine.eval(fact);//from   w  w  w  .  ja  v  a2  s.  c  om
    System.out.println(System.currentTimeMillis() - time);

    Compilable compilable = null;
    if (engine instanceof Compilable) {
        compilable = (Compilable) engine;
        CompiledScript script = compilable.compile(fact);

        time = System.currentTimeMillis();
        for (int i = 0; i < MAX_ITERATIONS; i++)
            script.eval();
        System.out.println(System.currentTimeMillis() - time);
    }
}

From source file:FuncEvaluator.java

  public static void main(String[] args) {
  if (args.length != 2) {
    System.err//from   w w w  . ja va  2s  .c  om
        .println("usage: java FuncEvaluator scriptfile " + "script-exp");
    return;
  }

  ScriptEngineManager manager = new ScriptEngineManager();
  ScriptEngine engine = manager.getEngineByName("rhino");

  try {
    System.out.println(engine.eval(new FileReader(args[0])));
    System.out.println(engine.eval(args[1]));
  } catch (ScriptException se) {
    System.err.println(se.getMessage());
  } catch (IOException ioe) {
    System.err.println(ioe.getMessage());
  }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");
    if (!(engine instanceof Invocable)) {
        System.out.println("Invoking methods is not supported.");
        return;//  ww w .  j  a v a  2  s  . com
    }
    Invocable inv = (Invocable) engine;
    String scriptPath = "c:/Java_Dev/calculator.js";

    engine.eval("load('" + scriptPath + "')");

    Object calculator = engine.get("calculator");

    int x = 3;
    int y = 4;
    Object addResult = inv.invokeMethod(calculator, "add", x, y);
    Object subResult = inv.invokeMethod(calculator, "subtract", x, y);
    Object mulResult = inv.invokeMethod(calculator, "multiply", x, y);
    Object divResult = inv.invokeMethod(calculator, "divide", x, y);

    System.out.println(addResult);
    System.out.println(subResult);
    System.out.println(mulResult);
    System.out.println(divResult);
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    // create a script engine manager
    ScriptEngineManager factory = new ScriptEngineManager();
    // create a JavaScript engine
    ScriptEngine engine = factory.getEngineByName("JavaScript");
    // evaluate JavaScript code from String
    Object obj = engine.eval("1+2");
    System.out.println(obj);/* w w  w. j a va 2  s .c o m*/
}

From source file:Main.java

public static void main(String[] args) throws ScriptException {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");

    manager.put("n1", 1);
    String script = "var sum = n1 + n2;print(msg + " + "' n1=' + n1 + ', n2=' + n2 + " + "', sum=' + sum);";

    engine.put("n2", 2);
    engine.put("msg", "a string");
    engine.eval(script);/*from w w  w  .  ja  v  a 2  s  .  c  o  m*/

    Bindings bindings = engine.createBindings();
    bindings.put("n2", 3);
    bindings.put("msg", "another string");
    engine.eval(script, bindings);

    ScriptContext ctx = new SimpleScriptContext();
    Bindings ctxGlobalBindings = engine.createBindings();
    ctx.setBindings(ctxGlobalBindings, GLOBAL_SCOPE);
    ctx.setAttribute("n1", 4, GLOBAL_SCOPE);
    ctx.setAttribute("n2", 5, ENGINE_SCOPE);
    ctx.setAttribute("msg", "ScriptContext:", ENGINE_SCOPE);
    engine.eval(script, ctx);

    engine.eval(script);
}

From source file:Main.java

public static void main(String[] args) {
    // Create a script engine manager
    ScriptEngineManager manager = new ScriptEngineManager();

    // Obtain a script engine from the manager
    ScriptEngine engine = manager.getEngineByName("JavaScript");

    // Store the script in a String
    String script = "print('hi from java2s.com!')";
    try {/*  www.  j a v  a2s.c  o m*/
        // Execute the script
        engine.eval(script);
    } catch (ScriptException e) {
        e.printStackTrace();
    }
}