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, //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,注意參数传递的方法 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); //定义线程执行之 Thread t = new Thread(runner); t.start(); t.join(); //导入其它java包 String jsCode = "importPackage(java.util); var list2 = Arrays.asList(['A', 'B', 'C']); "; engine.eval(jsCode); List list2 = (List ) engine.get("list2"); for (String val : list2) { System.out.println(val);} }} 脚本引擎为实现动态功能(如插件机制)提供了良好的扩展性.
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