JDK8中Java调用Javascript脚本引擎动态定义与执行代码

import java.lang.*;
import java.util.Arrays;
import java.util.List;

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

public class ScriptEngineTest {

public static void main(String[] args) throws Exception {
ScriptEngineManager sem = new ScriptEngineManager();
ScriptEngine engine = sem.getEngineByName("javascript");     //python or jython,

<pre name="code" class="html">   //向上下文中存入变量
engine.put("msg", "just a test");
//定义类user
String str = "msg += '!!!';var user = {name:'tom',age:23,hobbies:['football','basketball']}; ";
engine.eval(str);

//从上下文引擎中取值
String msg = (String) engine.get("msg");
String name = (String) engine.get("name");
String[] hb = engine.get("hb");
System.out.println(msg);
System.out.println(name + ":" + hb[0]);

//定义数学函数
engine.eval("function add (a, b) {c = a + b; return c; }");

//取得调用接口
Invocable jsInvoke = (Invocable) engine;

//定义加法函数

Object result1 = jsInvoke.invokeFunction("add", new Object[] { 10, 5 });

System.out.println(result1);

//调用加法函数,注意参数传递的方法

Adder adder = jsInvoke.getInterface(Adder.class);

int result2 = adder.add(10, 35);

System.out.println(result2);

//定义run()函数

engine.eval("function run() {print('www.java2s.com');}");

Invocable invokeEngine = (Invocable) engine;

Runnable runner = invokeEngine.getInterface(Runnable.class);
//定义线程运行之

Thread t = new Thread(runner);

t.start();

t.join();

//导入其他java包

String jsCode = "importPackage(java.util);

var list2 = Arrays.asList(['A', 'B', 'C']); ";

engine.eval(jsCode);

List<String> list2 = (List<String>) engine.get("list2");

for (String val : list2) { System.out.println(val);}

}

}