如何处理 java.security.AccessControlException
我正在尝试在本地启动我的小程序，这是我得到的异常：
我不知道为什么会发生这种情况，mp3 已经位于 jar 文件中，为什么我无法访问它？
SEVERE: null
java.security.AccessControlException: access denied (java.io.FilePermission file:\C:\applet\CairoNightTrainClient.jar!\Music\train.mp3 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.FileInputStream.<init>(Unknown Source)
at com.sun.media.codec.audio.mp3.JS_MP3FileReader.getAudioInputStream(JS_MP3FileReader.java:113)
at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
at LogicEngine.DJ.createClip(DJ.java:56)
at LogicEngine.DJ.<init>(DJ.java:42)
at GUI.JPanelGameApplet$1.run(JPanelGameApplet.java:65)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
I'm trying to launch my applet locally and this is the exception I get:
I don't know why this is happening the mp3 is already located on the jar file, why can't I access it?
SEVERE: null
java.security.AccessControlException: access denied (java.io.FilePermission file:\C:\applet\CairoNightTrainClient.jar!\Music\train.mp3 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.FileInputStream.<init>(Unknown Source)
at com.sun.media.codec.audio.mp3.JS_MP3FileReader.getAudioInputStream(JS_MP3FileReader.java:113)
at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
at LogicEngine.DJ.createClip(DJ.java:56)
at LogicEngine.DJ.<init>(DJ.java:42)
at GUI.JPanelGameApplet$1.run(JPanelGameApplet.java:65)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
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不允许小程序（或至少不受信任的小程序）访问本地文件系统。这是一件好事，因为如果随机网站有这样的访问权限，大多数人可能会感到不安。
如果你想访问一个文件，请通过
javax.jnlp（只需谷歌一下），它将提供一个API，为用户提供一个文件选择器，以允许小程序读取他们选择的特定文件。如果它只是小程序一部分的文件，请使用资源 (Class.getResourceAsStream) 或通过 http 连接 (URL)
Applets (or at least untrusted applets) are not allowed to access the local file system. This is kind of a good thing as most people might get upset if random websites had such access.
If you want to access a file go through
javax.jnlp(just google it) and it'll provide an API that presents the user with a file chooser to allow applets to read a specific file of their choosing.If it's just a file that is part of the applet, use either a resource (Class.getResourceAsStream) or through an http connection (URL)