从签名的 Java 小程序中删除文件 [英] Deleting files from signed java applet

问题描述

当他退出应用程序时，我必须从用户系统中删除一些临时文件.该应用程序有小程序.小程序jar 已签名.我遵循调用applet 的destroy 方法来删​​除文件的策略.我正在通过 javascript 调用小程序的销毁方法像 document.myApplet.destroy() .调用此后，我在浏览器上收到错误

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 未捕获的错误:在 NPObject 上调用方法时出错.

推荐答案

好的，我自己得到了答案:参考此链接后 http://docs.oracle.com/javase/7/docs/api/java/security/AccessController.html ，我想通了，读取、写入甚至删除都可以通过将它们封装在 AccessController.doPrivileged 方法中来完成.

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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