package com.dasenlin.baidu;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.util.List;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

/**
 * 用java代码编写javascript
 * @author Administrator
 *
 */
public class JavaScriptRhino {

    /**
     * @param args
     */
    public static void main(String[] args) {
        //获取脚本引擎对象
        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine engine =sem.getEngineByName("javascript");
        //定义变量，存储到引擎上下文中。
        engine.put("msg", "you are a good man!");
        String str ="var user ={name:'gaoqi',age:18,school:['清华大学','北京尚学堂']};";
        str +="println(user.name);";
        //执行脚本
        try {
            engine.eval(str);
            engine.eval("msg ='xiaoming is a diaosi man';");
            System.out.println(engine.get("msg"));
        } catch (ScriptException e) {
            e.printStackTrace();
        }
        try {
            //定义函数
            engine.eval("function add(a,b){var sum =a+b;return sum;}");
            //取得调用接口
            Invocable jsInvoke =(Invocable)engine;
            Object result1 =jsInvoke.invokeFunction("add", new Object[]{13,20});
            System.out.println(result1);
        } catch (ScriptException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }
        //导入其他java的包，使用其他包中的java类
        try {
            String jsCode="importPackage(java.util); var list=Arrays.asList([\"北京尚学堂\",\"清华大学\",\"北京大学\"])";
            engine.eval(jsCode);
            List<String>list2 = (List<String>)engine.get("list");
            for(String temp:list2){
                System.out.println(temp);
            }
        } catch (ScriptException e) {
            e.printStackTrace();
        }
        //执行一个src下的a.js文件
        try {
            URL url=JavaScriptRhino.class.getClassLoader().getResource("a.js");
            FileReader fr=new FileReader(url.getPath());
            engine.eval(fr);
            fr.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (ScriptException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}