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

灌木 2013-05-26 09:41:23

写的一个Applet小程序，在读入一个图片时，出现了java.security.AccessControlException异常，怎么处理。
Exception in thread "Thread-3" java.security.AccessControlException: access deni
ed ("java.io.FilePermission" "\D:\java\javaAppletExample\ch2\html\Sunset.gif" "r
ead")
at java.security.AccessControlContext.checkPermission(AccessControlConte
xt.java:366)
at java.security.AccessController.checkPermission(AccessController.java:
555)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at java.lang.SecurityManager.checkRead(SecurityManager.java:888)
at sun.awt.image.URLImageSource.<init>(URLImageSource.java:55)
at sun.applet.AppletImageRef.reconstitute(AppletImageRef.java:51)
at sun.misc.Ref.get(Ref.java:64)
at sun.applet.AppletViewer.getCachedImage(AppletViewer.java:395)
at sun.applet.AppletViewer.getImage(AppletViewer.java:390)
at java.applet.Applet.getImage(Applet.java:274)
at java.applet.Applet.getImage(Applet.java:296)
at Ripple.run(Ripple.java:47)
at java.lang.Thread.run(Thread.java:722)
源程序47行是：
image = getImage(getDocumentBase(),name);

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Emily_cao 2015-06-29

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追问一下，出现AccessControlException，需要修改jdk//lib/security/java.‍policy文件还是，jdk/jre//lib/security/java.‍policy文件

灌木 2013-06-08

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引用 2 楼 jintianhen1 的回复:

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 " < <ALL FILES> > ", "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;

看着好复杂啊

静山晚风 2013-05-28

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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 " < <ALL FILES> > ", "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;

静山晚风 2013-05-28