Java 如何关闭PDF文件以重新创建它？（正在使用的文件）_Java_Pdf_Itext

Java 如何关闭PDF文件以重新创建它？（正在使用的文件）

java pdf itext

Java 如何关闭PDF文件以重新创建它？（正在使用的文件）,java,pdf,itext,Java,Pdf,Itext,我有一个可以创建PDF文件的Java应用程序。例如，我从我的程序中创建了一个简单的文件，我构建了代码来打开这个文件。所以我创建了这个文件，我看到它，然后就可以了。如果我想修改该文件，我必须关闭该文件，然后重新创建它，如果我不关闭该文件，我会出现以下错误： java.io.FileNotFoundException: Archivio_Etichette\_12-4-2015.pdf (Impossibile accedere al file. Il file è utilizzato da

我有一个可以创建PDF文件的Java应用程序。例如，我从我的程序中创建了一个简单的文件，我构建了代码来打开这个文件。所以我创建了这个文件，我看到它，然后就可以了。如果我想修改该文件，我必须关闭该文件，然后重新创建它，如果我不关闭该文件，我会出现以下错误：

java.io.FileNotFoundException: Archivio_Etichette\_12-4-2015.pdf (Impossibile accedere al file. Il file è utilizzato da un altro processo)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:171)
    at com.mcsolution.easyMgmt.print.pdf.FoglioFattura.stampaEtichette(FoglioFattura.java:2215)
    at Etichette.PanelBigliettiAdesivi.stampaEtichette(PanelBigliettiAdesivi.java:242)
    at Etichette.PanelBigliettiAdesivi$1.actionPerformed(PanelBigliettiAdesivi.java:273)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.Component.processMouseEvent(Component.java:6516)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
    at java.awt.Component.processEvent(Component.java:6281)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4872)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4698)
    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:4698)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    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:708)
    at java.awt.EventQueue$4.run(EventQueue.java:706)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

如何修复它？

您的程序中的流即使在到达程序末尾后仍然是打开的。您可以先关闭流，然后重新打开以供下次使用。例如，您需要在最后一个catch块的末尾添加一个finally块，并在其中关闭您正在使用的流

finally{
 os.close();
}

接下来，您将需要添加用于编辑目的的代码，通过提供创建文件的路径，您可以再次打开流以读取先前的文件。请记住再次关闭流。

您的程序中的流即使在到达程序末尾后仍处于打开状态。您可以先关闭流，然后重新打开以供下次使用。例如，您需要在最后一个catch块的末尾添加一个finally块，并在其中关闭您正在使用的流

finally{
 os.close();
}

接下来，您将需要添加用于编辑目的的代码，通过提供创建文件的路径，您可以再次打开流以读取先前的文件。请记住再次关闭流。

您需要关闭文件。问题类似于试图删除或重命名打开的文件：如果您在Windows上工作，Windows将显示此错误：

java.io.FileNotFoundException: Archivio_Etichette\_12-4-2015.pdf (Impossibile accedere al file. Il file è utilizzato da un altro processo)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:171)
    at com.mcsolution.easyMgmt.print.pdf.FoglioFattura.stampaEtichette(FoglioFattura.java:2215)
    at Etichette.PanelBigliettiAdesivi.stampaEtichette(PanelBigliettiAdesivi.java:242)
    at Etichette.PanelBigliettiAdesivi$1.actionPerformed(PanelBigliettiAdesivi.java:273)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.Component.processMouseEvent(Component.java:6516)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
    at java.awt.Component.processEvent(Component.java:6281)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4872)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4698)
    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:4698)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    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:708)
    at java.awt.EventQueue$4.run(EventQueue.java:706)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

您遇到了完全相同的问题：在本例中，我尝试在Windows资源管理器中重命名名为hello.pdf的文件。但是，此操作无法完成，因为文件已在Adobe Acrobat中打开。Adobe Reader和Adobe Acrobat等工具需要随机访问该文件，因此会锁定该文件，以便其他进程无法删除、重写和重命名该文件

该解决方案也显示在对话框中：关闭文件，然后重试。您正在尝试做一些不可能的事情，这些事情与您使用iText无关或不受您的限制

注

在处理iText项目时，我遇到了与您经常描述的相同的问题：我编写一些代码，运行它，查看生成的PDF，更改代码，运行它，然后得到与您得到的相同的异常。为了避免这种情况，我经常创建名称中带有时间戳的文件。例如，hello-201504111163400.pdf，然后在30秒后运行相同的代码hello-201504111163430.pdf等等，文件名是基于当前日期和时间创建的。这样，我就可以避免这种异常。

您需要关闭该文件。问题类似于试图删除或重命名打开的文件：如果您在Windows上工作，Windows将显示此错误：

java.io.FileNotFoundException: Archivio_Etichette\_12-4-2015.pdf (Impossibile accedere al file. Il file è utilizzato da un altro processo)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:171)
    at com.mcsolution.easyMgmt.print.pdf.FoglioFattura.stampaEtichette(FoglioFattura.java:2215)
    at Etichette.PanelBigliettiAdesivi.stampaEtichette(PanelBigliettiAdesivi.java:242)
    at Etichette.PanelBigliettiAdesivi$1.actionPerformed(PanelBigliettiAdesivi.java:273)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.Component.processMouseEvent(Component.java:6516)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
    at java.awt.Component.processEvent(Component.java:6281)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4872)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4698)
    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:4698)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    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:708)
    at java.awt.EventQueue$4.run(EventQueue.java:706)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

该解决方案也显示在对话框中：关闭文件，然后重试。您正在尝试做一些不可能的事情，这些事情与您使用iText无关或不受您的限制

注

当abrire为false且该方法被调用两次时，是否会发生错误？如果不是，则问题在于Desktopopen启动的桌面应用程序。请注意，如果您在Linux下工作，某些lsof可能会帮助您解决问题。当abrire为false且该方法被调用两次时，是否会发生错误？如果不是，则问题在于Desktopopen启动的桌面应用程序。请注意，如果您在linux下工作，一些lsof可能会帮助您解决问题