从签署Java小程序删除文件 [英] Deleting files from signed java applet

问题描述

我要删除用户系统的一些临时文件，当他登录的应用出来。该应用程序有小程序。小程序罐子签署。我下面来调用Applet的破坏方法来删除文件的策略。我调用由 JavaScript中的破坏小程序的方法
例如 document.myApplet.destroy（）。在调用此之后，我越来越对浏览器的误差

I have to delete some temporary file from a users system when he logs out of application. The application has applet. The applet jar is signed. I am following the strategy to call the applet's destroy method to delete files. I am invoking the destroy method of applet by javascript like document.myApplet.destroy() . After invoking this I am getting the error on browser as

未捕获的错误：java.security.AccessControlException：访问被拒绝（java.io.FilePermission中未被捕获的错误：错误调用NPObject法

推荐答案

好吧，我得到了自己的答案：指的是这个环节的 http://docs.oracle.com/javase/7/docs/api/java/security/AccessController.html ，我想通了，即读取，写入或删除，甚至可以通过在AccessController.doPrivileged方法包木窗它们来完成。

Ok I got the answer myself: After refering to this link http://docs.oracle.com/javase/7/docs/api/java/security/AccessController.html , I figured out ,that reading,writing or even deleting can be done by wraping them up in AccessController.doPrivileged method.

AccessController.doPrivileged(new PrivilegedAction() {

                @Override
                public Object run() {
                    try {
                        deleteAppCacheDirectory();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    return null;
                }

            });

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