使用java执行javascript脚本

原来java可以执行javascript脚本的，这个可帮了大忙。

以下代码可以执行一个js文件中的某个js方法：

public class RunJs {

	public static void main(String[] args) throws FileNotFoundException, ScriptException, NoSuchMethodException {
		ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
        ScriptEngine engine = scriptEngineManager.getEngineByExtension("js");
        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("google_tk.js")));
        
        engine.eval(reader);
        
        Invocable invocable = (Invocable)engine;
		//这里参数 第一个是js文件中的js function名字，第二个是funciton接受的参数
        Object result = invocable.invokeFunction("VL", "happy new year!");
        System.out.println(result);
	}
	
	/**
	 * java调用js
	 * @param filePath
	 * @param menthod
	 * @param parm
	 * @return
	 */
	public static String invokeJs(String filePath,String menthod,String parm) throws Exception{
		
		ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
        ScriptEngine engine = scriptEngineManager.getEngineByExtension("js");
        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath)));
        
        engine.eval(reader);
        
        Invocable invocable = (Invocable)engine;
        Object result = invocable.invokeFunction(menthod,parm);
		
		return result.toString();
	}

}