java脚本执行简单的js文件中的函数

import java.io.File;
import java.io.FileReader;

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

public class 执行JS文件 {
 
 public static void main(String[] args) {
  try {
   执行JS文件 engine = new 执行JS文件();
   engine.exeFunAdd(100, 200);
  } catch(Exception e) {
   e.printStackTrace();
  }
 }
 
 public String getPath() {
  File f = new File("");
  return f.getAbsolutePath() + "/js/";
 }
 
 public void exeFunAdd(int a ,int b) {
  ScriptEngineManager sem = new ScriptEngineManager();
  ScriptEngine jsEngine = sem.getEngineByName("javascript");
  try {
   jsEngine.eval(new FileReader(getPath()+"funs.js"));
  } catch (Exception e) {
   e.printStackTrace();
  }
  Invocable invocableEngine = (Invocable)jsEngine;
  try {
   Object ret = invocableEngine.invokeFunction("add", a,b);
   System.out.println(ret);
  } catch (Exception e) {
   
  }
 }
}