java利用JDK调用并执行js源码

function merge(a, b) { 
 c = a * b; 
 return c; 
}

function isPrime (num)    
{    
    if (num <= 1) {    
        print("Please enter a positive integer >= 2.")    
        return false   
    }    
        
    var prime = true   
    var sqrRoot = Math.round(Math.sqrt(num))    
        
    for (var n = 2; prime & n <= sqrRoot; ++n) {    
        prime = (num % n != 0)    
    }    
        
    return prime    
} 

package com.yeezhao.common.js;

import java.io.FileReader;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**
 * JAVA 调用 js脚本
 * @author Administrator -> junhong
 * @since  2016年12月14日 上午11:20:00
 */
public class ScriptEngineTest {

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

        String jsFileName = "expression.js"; // 读取js文件

        String path = ScriptEngineTest.class.getClassLoader().getResource("").getPath();
        System.out.println("path=" + path);
        FileReader reader = new FileReader(path + jsFileName); // 执行指定脚本
        engine.eval(reader);

        if (engine instanceof Invocable) {
            Invocable invoke = (Invocable) engine; // 调用merge方法，并传入两个参数

            // c = merge(2, 3);

            Double c = (Double) invoke.invokeFunction("merge", 2, 3);

            System.out.println("c = " + c);

            // ok = isPrime(5);
            Integer[] nums = { 1, 2, 3, 5, 12, 112, 100, 4351561 };
            for (Integer num : nums) {
                System.out.println(num + " --> " + invoke.invokeFunction("isPrime", num));
            }
            
            //hellp
            invoke.invokeFunction("hello1", "John");
        }

        reader.close();

    }
}

path=/D:/Eclipse/workspace/yz-test-20161207/target/classes/
c = 6.0
Please enter a positive integer >= 2.1 --> false
2 --> true
3 --> true
5 --> true
12 --> false
112 --> false
100 --> false
4351561 --> true
before hello2    ----> hello2     John
after hello2