Execute Javascript script in a file : Script Engines « Development « Java Tutorial

1. Java Tutorial
2. Development
3. Script Engines

import java.io.FileReader;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class RunScriptFileDemo {
  public static void main(String[] args) {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("js");
    try {
      FileReader reader = new FileReader("yourFile.js");
      engine.eval(reader);
      reader.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}
/* File: yourFile.js
 * 
 function add(a, b) {
    c = a + b;
    return c;
}

result = add (10, 5);
print ('Result = ' + result);
*/