8.4（Java学习笔记）java脚本引擎（Rhino）

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


public class TestRhino {
    public static void main(String[] args) throws ScriptException {
        //获取脚本引擎，并指定脚本语言
        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine engine = sem.getEngineByName("Javascript");
        //定义上下文变量，被脚本和java共享
        engine.put("msg", "Javascript");
        //定义脚本代码
        String str = "var user = {name:'hcf',age:19,sex:'man'};";
        str+="print(user.name);";
        //执行脚本
        engine.eval(str);
        System.out.println("修改前的内容:"+engine.get("msg"));
        engine.eval("msg ='java';");//修改msg内容
        System.out.println("修改后的内容:"+engine.get("msg"));
        
    }
}

运行结果：
hcf
修改前的内容Javascript
修改后的内容java

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


public class TestRhino {
    public static void main(String[] args) throws ScriptException {
        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine engine = sem.getEngineByName("Javascript");
        //定义方法的字符串形式
        String funAdd = "function add(a,b){"
                    + "      var sum = a + b;"
                    + "     return sum;"
                    + "  }";
        engine.eval(funAdd);//这一步可以看做将方法写入脚本
        Invocable invo = (Invocable)engine;//转换成Invocable
        Object result = null;
        try {
            //执行脚本中方法
            result = invo.invokeFunction("add",new Object[]{17,23});
        } catch (NoSuchMethodException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println(result);
    }
}

运行结果：
40.0

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.Reader;

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


public class TestRhino {
    public static void main(String[] args) throws ScriptException {
        //E:\eclipse\Rhino
        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine engine = sem.getEngineByName("Javascript");
        //脚本文件路径
        String path = "E:\\eclipse\\Rhino\\test.js";
        Reader read = null;
        try {
            //通过脚本文件路径构造Reader对象
            read = new FileReader(new File(path));
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //执行脚本文件
        engine.eval(read);
    }
}

运行结果：
a+b = 7