java 脚本引擎执行javascript脚本

public class ScriptTest {
public static void main(String args[]) throws ScriptException, NoSuchMethodException, IOException {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("javascript");

//声明一个msg 变量
engine.put("msg","this is msg!");

String jsCode = "var a = 10; var b =20;println(a+b);";
//执行javascript代码
engine.eval(jsCode);
//修改变量
engine.eval("msg = 'this is msg2!';println(msg);");
//使用java获取变量
System.err.println(engine.get("msg"));
//执行js方法
String jsFunc="function add(a,b){return a+b}";
engine.eval(jsFunc);
Invocable invocable = (Invocable) engine;
Object res = invocable.invokeFunction("add",new Object[]{5,7});
System.err.println(res);

//在脚本中使用java
String importJava = "importPackage(java.util);var list = Arrays.asList([\"嘻嘻\",\"哈哈\",\"咕咕\"]);";
engine.eval(importJava);
List list = (List) engine.get("list");
System.err.println(list);

//执行js文件
URL url = ScriptTest.class.getClassLoader().getResource("test.js");
FileReader reader = new FileReader(url.getPath());
engine.eval(reader);
reader.close();

}

test.js(src下)

var a = 10;
var b = 30;
function mul() {
return a*b;
}

println(mul());