[英]File Permissions error in Java Applet
我有一個 Java 小程序,它需要使用一些文件夾來讀取一些文件等。 這些文件夾位於正確的位置,並且與 index.html(運行該小程序)位於同一目錄中。 這是 JApplet 吐出的錯誤:
java.lang.reflect.InvocationTargetException
at com.sun.deploy.util.DeployAWTUtil.invokeAndWait(DeployAWTUtil.java:116)
at sun.plugin2.applet.Plugin2Manager.runOnEDT(Plugin2Manager.java:3541)
at sun.plugin2.applet.Plugin2Manager.createApplet(Plugin2Manager.java:3072)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1497)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.security.AccessControlException: access denied (java.io.FilePermission ./results read)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:374)
at java.security.AccessController.checkPermission(AccessController.java:546)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
at java.lang.SecurityManager.checkRead(SecurityManager.java:871)
at java.io.File.list(File.java:971)
at java.io.File.listFiles(File.java:1129)
at WhoHasMore.JShellFrame.getDefaultResultsFileName(JShellFrame.java:453)
at WhoHasMore.JShellFrame.<init>(JShellFrame.java:28)
at WhoHasMore.<init>(WhoHasMore.java:23)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at sun.plugin2.applet.Plugin2Manager$13.run(Plugin2Manager.java:3060)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:677)
at java.awt.EventQueue.access$000(EventQueue.java:85)
at java.awt.EventQueue$1.run(EventQueue.java:638)
at java.awt.EventQueue$1.run(EventQueue.java:636)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:647)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Exception: java.lang.reflect.InvocationTargetException
如您所見,錯誤似乎來自
Caused by: java.security.AccessControlException: access denied (java.io.FilePermission ./results read)
為什么拒絕訪問名為“結果”的文件夾? 我該如何解決?
您嘗試使用的方法 ( java.io.File.listFiles
) 不適用於 HTTP。您將需要選擇另一種列出文件的方式,例如將文件列表放入已知 URL 的文本文件中並下載,或使其成為 applet jarfile 的一部分。
為什么拒絕訪問名為“結果”的文件夾?
Java 沙箱阻止小程序訪問用戶機器上的文件系統。
我該如何解決?
如果你想讓你的小程序能夠做這種事情,你必須:
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