写入相对文本文件。JAVA

当试图写入一个相对的文本文件时，我要么创建一个无用的新文本文件，要么就是无法写入。 现在我正在这样做

String file = new File("").toURI().relativize(new File(Launcher.class.getResource("/Account.txt").toString()).toURI()).getPath();

及

错误是

java.io.FileNotFoundException: file:/Users/MyName/Folder/Folder2/Folder3/Launcher/bin/Account.txt (No such file or directory)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:212)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:104)
    at java.io.PrintWriter.<init>(PrintWriter.java:184)
    at Launcher$Account.actionPerformed(Launcher.java:382)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$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.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:729)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:688)
    at java.awt.EventQueue$3.run(EventQueue.java:686)
    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:702)
    at java.awt.EventQueue$4.run(EventQueue.java:700)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
    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)

java.io.FileNotFoundException:file:/Users/MyName/Folder/Folder2/Folder3/Launcher/bin/Account.txt（没有这样的文件或目录）
在java.io.FileOutputStream.open（本机方法）
位于java.io.FileOutputStream。（FileOutputStream.java:212）
位于java.io.FileOutputStream。（FileOutputStream.java:104）
位于java.io.PrintWriter（PrintWriter.java:184）
在Launcher$Account.actionPerformed处（Launcher.java:382）
在javax.swing.AbstractButton.fireActionPerformed上（AbstractButton.java:2018）
位于javax.swing.AbstractButton$Handler.actionPerformed（AbstractButton.java:2341）
在javax.swing.DefaultButtonModel.fireActionPerformed上（DefaultButtonModel.java:402）
在javax.swing.DefaultButtonModel.setPressed中（DefaultButtonModel.java:259）
在javax.swing.plaf.basic.BasicButtonListener.MouseRelease（BasicButtonListener.java:252）
在java.awt.AWTEventMulticaster.mousererelease（AWTEventMulticaster.java:289）
位于java.awt.Component.ProcessMouseeEvent（Component.java:6505）
位于javax.swing.JComponent.ProcessMouseeEvent（JComponent.java:3321）
位于java.awt.Component.processEvent（Component.java:6270）
位于java.awt.Container.processEvent（Container.java:2229）
位于java.awt.Component.dispatchEventImpl（Component.java:4861）
位于java.awt.Container.dispatchEventImpl（Container.java:2287）
位于java.awt.Component.dispatchEvent（Component.java:4687）
位于java.awt.LightweightDispatcher.RetargetMouseeEvent（Container.java:4832）
位于java.awt.LightweightDispatcher.ProcessMouseeEvent（Container.java:4492）
位于java.awt.LightweightDispatcher.dispatchEvent（Container.java:4422）
位于java.awt.Container.dispatchEventImpl（Container.java:2273）
位于java.awt.Window.dispatchEventImpl（Window.java:2719）
位于java.awt.Component.dispatchEvent（Component.java:4687）
位于java.awt.EventQueue.dispatchEventImpl（EventQueue.java:729）
在java.awt.EventQueue.access$200（EventQueue.java:103）
在java.awt.EventQueue$3.run（EventQueue.java:688）
在java.awt.EventQueue$3.run（EventQueue.java:686）
位于java.security.AccessController.doPrivileged（本机方法）
位于java.security.ProtectionDomain$1.doIntersectionPrivilege（ProtectionDomain.java:76）
位于java.security.ProtectionDomain$1.doIntersectionPrivilege（ProtectionDomain.java:87）
在java.awt.EventQueue$4.run（EventQueue.java:702）
在java.awt.EventQueue$4.run（EventQueue.java:700）
位于java.security.AccessController.doPrivileged（本机方法）
位于java.security.ProtectionDomain$1.doIntersectionPrivilege（ProtectionDomain.java:76）
位于java.awt.EventQueue.dispatchEvent（EventQueue.java:699）
位于java.awt.EventDispatchThread.pumpOneEventForFilters（EventDispatchThread.java:242）
在java.awt.EventDispatchThread.PumpeEventsforFilter（EventDispatchThread.java:161）
位于java.awt.EventDispatchThread.PumpeEventsforHierarchy（EventDispatchThread.java:150）
位于java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:146）
位于java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:138）
在java.awt.EventDispatchThread.run（EventDispatchThread.java:91）

---

但是，它所说的不存在的目录是正确的目录

哇，仅仅获得一个相对的文件名就需要做很多工作。您希望您的文件名与什么相关？如果你想让它相对于当前目录，你应该只使用

新文件（“Account.txt”）

。问题是，如果我这样做，它最终会使jar文件需要与它在同一文件夹中的txt文件。但是通过使其相对，文本文件从一开始就在jar文件中。请澄清“相对”的含义。相对于什么？相对于特定目录？相对于应用程序.class文件？嵌入到应用程序的.jar文件中？如果从.jar运行时打印或检查

Launcher.class.getResource

返回的值，您将看到URL不是

文件：

URL，无法转换为java.io.file实例。Class.getResource返回的应用程序资源不可写。好的。但有没有办法通过解析使其可写？

java.io.FileNotFoundException: file:/Users/MyName/Folder/Folder2/Folder3/Launcher/bin/Account.txt (No such file or directory)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:212)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:104)
    at java.io.PrintWriter.<init>(PrintWriter.java:184)
    at Launcher$Account.actionPerformed(Launcher.java:382)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$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.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:729)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:688)
    at java.awt.EventQueue$3.run(EventQueue.java:686)
    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:702)
    at java.awt.EventQueue$4.run(EventQueue.java:700)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
    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)