java.security.AccessControlException异常一般怎么处理

java.security.AccessControlException异常一般怎么处理

因为浏览器只能访问一定目录下的文件，不是可以访问所有的文件，Applet没有那么高的权限。所以解决方案有两个：

1，通过签名来解决：

2，通过更改java/lib/security/java.‍policy文件来实现。当然这种方式肯定不安全。具体做法是：将下面内容添加到java.policy文件中：
‍ permission java.util.PropertyPermission "user.dir ", "read ";
permission java.util.PropertyPermission "user.home ", "read ";
permission java.util.PropertyPermission "java.home ", "read ";
permission java.util.PropertyPermission "java.class.path ", "read ";
permission java.util.PropertyPermission "user.name ", "read ";
permission java.lang.RuntimePermission "accessClassInPackage.sun.misc ";
permission java.lang.RuntimePermission "accessClassInPackage.sun.audio ";
permission java.lang.RuntimePermission "modifyThread ";
permission java.lang.RuntimePermission "modifyThreadGroup ";
permission java.lang.RuntimePermission "loadLibrary.* ";
permission java.io.FilePermission " < > ", "read ";
permission java.io.FilePermission "${user.dir}${/}jmf.log ", "write ";
permission java.io.FilePermission "${user.home}${/}.JMStudioCfg ", "write ";
permission java.net.SocketPermission "* ", "connect,accept ";
permission java.io.FilePermission "C:\WINNT\TEMP\* ", "write ";
permission java.io.FilePermission "C:\WINNT\TEMP\* ", "delete ";
permission java.awt.AWTPermission "showWindowWithoutWarningBanner ";
permission javax.sound.sampled.AudioPermission "record ";
permission java.net.SocketPermission "- ", "listen ";
permission java.net.SocketPermission "- ", "accept ";
permission java.net.SocketPermission "- ", "connect ";
permission java.net.SocketPermission "- ", "resolve ";
permission java.security.AllPermission;