脚本引擎Rhino执行javascript代码

1.javascript代码：a.js：

function test(){
	var a = 3;
	var b = 4;
	println("invoke a.js file:" + (3+4));
}

test();

2.java代码中执行a.js:

package com.buaa.testRhino;

import java.io.FileReader;
import java.net.URL;

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

public class Demo01 {
	public static void main(String[] args) {
		ScriptEngineManager sem = new ScriptEngineManager();
		ScriptEngine engine = sem.getEngineByName("javascript");
		
		//执行javascript文件a.js
		URL url = Demo01.class.getClassLoader().getResource("a.js");
		FileReader reader;
		try {
			reader = new FileReader(url.getPath());
			engine.eval(reader);
			reader.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}