package com.lee;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.util.Scanner;

import javax.script.Bindings;

import javax.script.Invocable;

import javax.script.ScriptContext;

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

import javax.script.ScriptException;

/**

 *

 * @author liyanxue

 */

public class JavaInvokeJS {

    public static void main(String[] args) throws FileNotFoundException, ScriptException, NoSuchMethodException {

        ScriptEngine engine = new ScriptEngineManager().getEngineByName("javascript" );

        Bindings bind = engine.createBindings();

        bind.put( "factor", 0);

        engine.setBindings(bind, ScriptContext. ENGINE_SCOPE);

        // 输入方式

        /*

         Scanner input = new Scanner(System.in);

         while (input.hasNextInt()) {

         int first = input.nextInt();

         int second = input.nextInt();

         System.out.println("输入的参数是：" + first + ", " + second);

         engine.eval(new FileReader("/Users/ liyanxue/model.js"));

         if (engine instanceof Invocable ) {

         Invocable in = (Invocable ) engine;

         // 执行 js函数

         Double result = (Double) in.invokeFunction("formula", first, second);

         System.out.println("运算结果是：" + result.intValue());

         }

         }

         */

        int first = 23;

        int second = 7;

        System. out.println("输入的参数是：" + first + ", " + second);

        engine.eval( new FileReader("/Users/liyanxue/model.js" ));

        if (engine instanceof Invocable) {

            Invocable in = (Invocable) engine;

            // 执行js函数

            Double result = (Double) in.invokeFunction( "formula", first, second);

            System. out.println("运算结果是：" + result.intValue());

        }

    }

} 

function formula(var1, var2) {

     return var1 + var2 + factor;

}