Scala 对象序列化

Question

我在打开序列化为单个 .bin 文件的多个对象时遇到问题。现在，当我尝试打开文件时只能读取一个对象。读取第一个对象后，将显示错误消息（并且不再读取其他对象）。我的代码如下所示：

val ois = new ObjectInputStream(new BufferedInputStream(newFileInputStream(chooser.selectedFile)))
val toRead:Int = ois.readInt()
    for (i <- 0 to toRead) {
      ois.readObject() match {
         case anObject : myObject =>
           aMutableBuffer += anObject
         case _ =>
      }
    ois.close()
    }

我收到的错误有很多如下：

Exception in thread "AWT-EventQueue-0" java.security.PrivilegedActionException:java.security.PrivilegedActionException: java.io.IOException: Stream closed
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:649)
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)
Caused by: java.security.PrivilegedActionException: java.io.IOException: Stream closed
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$2.run(EventQueue.java:652)
at java.awt.EventQueue$2.run(EventQueue.java:650)
... 9 more
Caused by: java.io.IOException: Stream closed
at java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:145)
at java.io.BufferedInputStream.read(BufferedInputStream.java:241)
at java.io.ObjectInputStream$PeekInputStream.peek(ObjectInputStream.java:2248)
at java.io.ObjectInputStream$BlockDataInputStream.peek(ObjectInputStream.java:2541)
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2551)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1296)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
atABCk.PhotoshopApp$$anonfun$ABCPhotoshopApp$$fileOpenPicture$1.apply$mcVI$sp(PhotoshopApp.scala:32)
at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:75)
at ABC.PhotoshopApp$.ABC$PhotoshopApp$$fileOpenPicture(PhotoshopApp.scala:31)
at ABC.PhotoshopApp$$anon$9$$anon$11$$anon$1$$anonfun$2.apply$mcV$sp(PhotoshopApp.scala:111)
at scala.swing.Action$$anon$2.apply(Action.scala:60)
at scala.swing.Action$$anon$1.actionPerformed(Action.scala:78)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:389)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:809)
at com.apple.laf.AquaMenuItemUI.doClick(AquaMenuItemUI.java:137)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.menuDragMouseReleased(BasicMenuItemUI.java:913)
at javax.swing.JMenuItem.fireMenuDragMouseReleased(JMenuItem.java:568)
at javax.swing.JMenuItem.processMenuDragMouseEvent(JMenuItem.java:465)
at javax.swing.JMenuItem.processMouseEvent(JMenuItem.java:411)
at javax.swing.MenuSelectionManager.processMouseEvent(MenuSelectionManager.java:305)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:852)
at java.awt.Component.processMouseEvent(Component.java:6373)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6138)
at java.awt.Container.processEvent(Container.java:2085)
at java.awt.Component.dispatchEventImpl(Component.java:4735)
at java.awt.Container.dispatchEventImpl(Container.java:2143)
at java.awt.Component.dispatchEvent(Component.java:4565)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4621)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4282)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4212)
at java.awt.Container.dispatchEventImpl(Container.java:2129)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4565)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:679)
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)
... 14 more

仅当我将对象读入跟踪对象的缓冲区时才会发生这种情况。此外，我能够正确保存文件（因为我已经完成了测试以确保一切都到达那里）。有人知道这里发生了什么吗？

Answer 1

您将在最后但在循环内部关闭 Stream ois 。然后你尝试在循环的第一行读取它。这显然会失败，并出现 IOException: Stream closeed