为什么 Java Applet 不能仅请求特定权限（例如，录制音频）
我正在构建一个录音小程序，因此它需要录制声音的权限。我签署了 jar 文件，现在当我加载小程序时，会弹出一个对话框，显示：“来自本地主机的小程序正在请求访问您的计算机”，并提供“允许”或“拒绝”选项。如果我点击允许，它就可以录制声音。但令我失望的是，似乎没有办法让它只要求它需要的东西；像“这个小程序想要录制声音的权限。允许或拒绝”？有办法做到这一点吗？
如果没有，您知道用这个“全有或全无”对话框抛弃 Java 细粒度安全模型的理由吗？我可以看到用户允许站点录制一些声音，但不想授予其对硬盘驱动器的读/写访问权限。
I'm building an audio recording applet, so it needs permission to record sound. I signed the jar file, and now when I load the applet, a dialog pops up that says: "The applet from localhost is requesting access to your computer", and gives options for "Allow" or "Deny". If I click allow, it can record sound. But I'm disappointed that there seems to be no way to have it ask only for what it needs; something like "This applet would like permission to record sound. Allow or Deny"? Is there a way to do this?
If not, any idea on the rationale for throwing away Java's fine grained security model with this all-or-nothing dialog box? I could see a user allowing a site to record some sound, but not wanting to give it read/write access to the hard drive.
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不。JRE 不向标准小程序提供如此细粒度的权限。
一个应用程序。使用 Java Web Start 启动可以访问本地文件系统、打印机和许多其他内容事情按照你建议的方式进行。但沙箱的“特定许可消息”放宽并不包括获取屏幕截图或捕获声音等内容。
No. The JRE does not offer such fine grained permissions to standard applets.
An app. launched using Java Web Start can get access to the local file system, the printer, and a number of other things in the way that you propose. But those 'specific permission message' relaxations of the sand-box do not include things like getting screen-shots or capturing sound.