Java - 如何在 Java Web Start 中获取权限
您好，我成功地为我的 Java 应用程序创建了 jar 和 .jnlp 文件，但在运行时遇到了麻烦。使用 Java Web Start 启动正常，但我想我需要做点什么 像平常一样，当我运行它时，它不会请求访问 HD 进行文件 I/O 的权限。
希望得到一些帮助和建议，以了解如何获得许可权，即我必须做什么，这是我必须对所有班级做的事情，但不确定。错误 我在 Java Web Start 中收到的消息如下。
Exception in thread "AWT-EventQueue-0" java.security.AccessControlException:
access denied (java.io.FilePermission StockDatabase;Stocks.dat read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(Unknown Source)
at java.io.File.exists(Unknown Source)
at StockCodeDatabase.<init>(OptraderSA.java:782)
at OptraderSA.actionPerformed(OptraderSA.java:136)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unkno
Hi managed to create the jar and .jnlp files for my Java application but running into trouble when it runs. Launches okay with Java Web Start but I think I need to do something
extra as normally when I run it it doesn't ask for permission to access the HD for file I/O.
Would appreciate some help and advise to know what to do to get the permission rights i.e. what do I have to do is it something I have to do to all my classes not sure. The error
message I get in Java Web Start is as below.
Exception in thread "AWT-EventQueue-0" java.security.AccessControlException:
access denied (java.io.FilePermission StockDatabase;Stocks.dat read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(Unknown Source)
at java.io.File.exists(Unknown Source)
at StockCodeDatabase.<init>(OptraderSA.java:782)
at OptraderSA.actionPerformed(OptraderSA.java:136)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unkno
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您需要对 JNLP 文件进行签名并配置
You need to sign your JNLP file and configure the
<security>element, as discussed here.将以下内容添加到您的 JNLP：
这将弹出一个对话框，要求用户为您的应用程序授予必要的权限。
Add the following to your JNLP:
This will pop a dialogue asking the user the give the necessary permission to your app.
如果您想访问文件系统，您需要更改 JNLP 文件以包括：
这还要求您对 jar 文件进行签名。
另一种选择是将文件作为资源打包在 jar 内，而您不必执行所有这些操作。
If you want access to the file system you need to change your JNLP file to include:
This requires you to also sign your jar files.
Another option is to package the file inside the jar as a resource and you don't have to do all that.