java IOexception：Stream Closed
这是我目前的代码：
public class FileStatus extends Status{ FileWriter writer; public FileStatus(){ try { writer = new FileWriter("status.txt",true); } catch (IOException e) { e.printStackTrace(); } } public void writeToFile(){ String file_text= pedStatusText + " " + gatesStatus + " " + DrawBridgeStatusText; try { writer.write(file_text); writer.flush(); writer.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 一切都按预期工作（文件在调用writeToFile方法时写入）。 但是当第二次调用writeToFile方法时，我收到以下错误：
java.io.IOException: Stream closed at sun.nio.cs.StreamEncoder.ensureOpen(StreamEncoder.java:45) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:118) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:135) at java.io.OutputStreamWriter.write(OutputStreamWriter.java:220) at java.io.Writer.write(Writer.java:157) at FileStatus.writeToFile(FileStatus.java:19) at MenuBar$9.actionPerformed(MenuBar.java:115) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.AbstractButton.doClick(AbstractButton.java:376) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877) at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289) at java.awt.Component.processMouseEvent(Component.java:6505) at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) at java.awt.Component.processEvent(Component.java:6270) at java.awt.Container.processEvent(Container.java:2229) at java.awt.Component.dispatchEventImpl(Component.java:4861) at java.awt.Container.dispatchEventImpl(Container.java:2287) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422) at java.awt.Container.dispatchEventImpl(Container.java:2273) at java.awt.Window.dispatchEventImpl(Window.java:2719) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:703) at java.awt.EventQueue.access$000(EventQueue.java:102) at java.awt.EventQueue$3.run(EventQueue.java:662) at java.awt.EventQueue$3.run(EventQueue.java:660) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87) at java.awt.EventQueue$4.run(EventQueue.java:676) at java.awt.EventQueue$4.run(EventQueue.java:674) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:673) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139) at java.awt.EventDispatchThread.run(EventDispatchThread.java:97) java.io.IOException: Stream closed at sun.nio.cs.StreamEncoder.ensureOpen(StreamEncoder.java:45) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:118) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:135) at java.io.OutputStreamWriter.write(OutputStreamWriter.java:220) at java.io.Writer.write(Writer.java:157) at FileStatus.writeToFile(FileStatus.java:19) at MenuBar$9.actionPerformed(MenuBar.java:115) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.AbstractButton.doClick(AbstractButton.java:376) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877) at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289) at java.awt.Component.processMouseEvent(Component.java:6505) at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) at java.awt.Component.processEvent(Component.java:6270) at java.awt.Container.processEvent(Container.java:2229) at java.awt.Component.dispatchEventImpl(Component.java:4861) at java.awt.Container.dispatchEventImpl(Container.java:2287) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422) at java.awt.Container.dispatchEventImpl(Container.java:2273) at java.awt.Window.dispatchEventImpl(Window.java:2719) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:703) at java.awt.EventQueue.access$000(EventQueue.java:102) at java.awt.EventQueue$3.run(EventQueue.java:662) at java.awt.EventQueue$3.run(EventQueue.java:660) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87) at java.awt.EventQueue$4.run(EventQueue.java:676) at java.awt.EventQueue$4.run(EventQueue.java:674) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:673) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139) at java.awt.EventDispatchThread.run(EventDispatchThread.java:97) java.io.IOException: Stream closed at sun.nio.cs.StreamEncoder.ensureOpen(StreamEncoder.java:45) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:118) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:135) at java.io.OutputStreamWriter.write(OutputStreamWriter.java:220) at java.io.Writer.write(Writer.java:157) at FileStatus.writeToFile(FileStatus.java:19) at MenuBar$9.actionPerformed(MenuBar.java:115) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.AbstractButton.doClick(AbstractButton.java:376) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877) at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289) at java.awt.Component.processMouseEvent(Component.java:6505) at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) at java.awt.Component.processEvent(Component.java:6270) at java.awt.Container.processEvent(Container.java:2229)
该文件仍然按预期第二次写入，但它会在第二次和将来调用writeToFile（）时抛出此错误。 我想知道是什么导致这个错误发生。
你正在调用writer.close(); 在你写完之后。 流关闭后，无法再次写入。 通常，我实现这个的方法是通过移动write to方法的结束。
public void writeToFile(){ String file_text= pedStatusText + " " + gatesStatus + " " + DrawBridgeStatusText; try { writer.write(file_text); writer.flush(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }
并添加方法cleanUp来关闭流。
public void cleanUp() { writer.close(); }
这意味着您有责任确保在写完文件后调用cleanUp 。 如果不这样做，将导致内存泄漏和资源锁定。
编辑 ：通过将writer移动到writeToFile()方法，您可以在每次要写入文件时创建新流。
public void writeToFile() { FileWriter writer = new FileWriter("status.txt", true); // ... Write to the file. writer.close(); }
不要在writeToFile()调用writeToFile() 。
你调用writer.close(); 在writeToFile所以writeToFile在第二次调用writeToFile时已经关闭。
为什么不将FileStatus合并到writeToFile ？