我正在尝试调用文件选择器选项并获取文件名作为输入。但是我得到了java AccessControlException。当我使用Web浏览器启动applet时，这很正常，但在尝试使用applet viewer时抛出异常。
我试过以下
AccessController.doPrivileged。但我仍然得到如下例外情况。
Exception in thread "AWT-EventQueue-1" java.security.AccessControlException: acc
ess denied (java.util.PropertyPermission user.dir read)
at java.security.AccessControlContext.checkPermission(AccessControlConte
xt.java:374)
at java.security.AccessController.checkPermission(AccessController.java:
546)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:12
85)
at java.lang.System.getProperty(System.java:650)
at java.io.Win32FileSystem.getUserPath(Win32FileSystem.java:296)
at java.io.Win32FileSystem.resolve(Win32FileSystem.java:312)
at java.io.File.getAbsolutePath(File.java:501)
at javax.swing.filechooser.WindowsFileSystemView.isFloppyDrive(FileSyste
mView.java:734)
at javax.swing.plaf.basic.BasicFileChooserUI$BasicFileView.getIcon(Basic
FileChooserUI.java:1200)
at javax.swing.JFileChooser.getIcon(JFileChooser.java:1538)
at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxRenderer.g
etListCellRendererComponent(MetalFileChooserUI.java:854)
at javax.swing.plaf.basic.BasicListUI.updateLayoutState(BasicListUI.java
:1344)
at javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(BasicListUI
.java:1294)
at javax.swing.plaf.basic.BasicListUI$Handler.valueChanged(BasicListUI.j
ava:2611)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSel
ectionModel.java:167)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSel
ectionModel.java:147)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSel
ectionModel.java:194)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSele
ctionModel.java:388)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSele
ctionModel.java:398)
at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultLis
tSelectionModel.java:442)
at javax.swing.JList.setSelectedIndex(JList.java:2179)
at javax.swing.plaf.basic.BasicComboPopup.setListSelection(BasicComboPop
up.java:1126)
at javax.swing.plaf.basic.BasicComboPopup.access$300(BasicComboPopup.jav
a:46)
at javax.swing.plaf.basic.BasicComboPopup$Handler.itemStateChanged(Basic
ComboPopup.java:964)
at javax.swing.JComboBox.fireItemStateChanged(JComboBox.java:1205)
at javax.swing.JComboBox.selectedItemChanged(JComboBox.java:1262)
at javax.swing.JComboBox.contentsChanged(JComboBox.java:1309)
at javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.j
ava:100)
at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.setS
electedItem(MetalFileChooserUI.java:1001)
at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.addI
tem(MetalFileChooserUI.java:972)
at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.acce
ss$900(MetalFileChooserUI.java:897)
at javax.swing.plaf.metal.MetalFileChooserUI.doDirectoryChanged(MetalFil
eChooserUI.java:648)
at javax.swing.plaf.metal.MetalFileChooserUI.access$1200(MetalFileChoose
rUI.java:38)
at javax.swing.plaf.metal.MetalFileChooserUI$5.propertyChange(MetalFileC
hooserUI.java:734)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup
port.java:339)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup
port.java:276)
at java.awt.Component.firePropertyChange(Component.java:8154)
at javax.swing.JFileChooser.setCurrentDirectory(JFileChooser.java:568)
at javax.swing.JFileChooser.<init>(JFileChooser.java:334)
at javax.swing.JFileChooser.<init>(JFileChooser.java:286)
at StegnoMainFrame.selectFileAction(StegnoMainFrame.java:596)
at StegnoMainFrame.access$800(StegnoMainFrame.java:48)
at StegnoMainFrame$4.actionPerformed(StegnoMainFrame.java:201)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:19
95)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.jav
a:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel
.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242
)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonL
istener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6289)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6054)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4652)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4482)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577
)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Component.dispatchEvent(Component.java:4482)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)
at java.awt.EventQueue.access$000(EventQueue.java:85)
at java.awt.EventQueue$1.run(EventQueue.java:603)
at java.awt.EventQueue$1.run(EventQueue.java:601)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessCo
ntrolContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessCo
ntrolContext.java:98)
at java.awt.EventQueue$2.run(EventQueue.java:617)
at java.awt.EventQueue$2.run(EventQueue.java:615)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessCo
ntrolContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre
ad.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.
java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
请在我使用doPrivileged的代码中找到我的代码部分。
private boolean selectFileAction(final String titleTextIn, final JTextField fileLocIn, final boolean allowFileFilter,
final boolean setOutFile)
{
String isOkSelected = "false";
final JFileChooser chooser = new JFileChooser();
isOkSelected = (String) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
if (allowFileFilter)
{
FileNameExtensionFilter filter = new FileNameExtensionFilter("GIF Images", "gif");
chooser.setFileFilter(filter);
}
if (setOutFile)
{
if (hideRadiButton.isSelected())
{
if (titleTextIn.contains("Key"))
chooser.setSelectedFile(new File("enckey"));
else
chooser.setSelectedFile(new File("output.gif"));
}
else
chooser.setSelectedFile(new File("output.txt"));
}
chooser.setDialogTitle(titleTextIn);
int returnVal = chooser.showOpenDialog(getContentPane());
boolean tempSelected = false;
if(returnVal == JFileChooser.APPROVE_OPTION) {
tempSelected = true;
fileLocIn.setText(chooser.getSelectedFile().getAbsolutePath());
}
System.loadLibrary("awt");
return tempSelected;
}
});
return Boolean.parseBoolean(isOkSelected);
}
答案 0 :(得分：0)
当我使用webbrowser
启动applet时，这很好用
那么没有（真正的）问题。
..但在尝试appletviewer时抛出异常。
SDK配置的最新版本的applet查看器沙盒，即使代码已签名并且您选择了相信它的菜单选项。从IDE启动时，Applet查看器通常具有包含所有权限的安全策略（即使未签名）。