jar中的Java访问文件导致java.nio.file.FileSystemNotFoundException [英] Java access files in jar causes java.nio.file.FileSystemNotFoundException

问题描述

尝试使用我的java应用程序将jar文件中的某些文件复制到临时目录时，会抛出以下异常：

While trying to copy some files in my jar file to a temp directory with my java app, the following exception is thrown:

java.nio.file.FileSystemNotFoundException
    at com.sun.nio.zipfs.ZipFileSystemProvider.getFileSystem(ZipFileSystemProvider.java:171)
    at com.sun.nio.zipfs.ZipFileSystemProvider.getPath(ZipFileSystemProvider.java:157)
    at java.nio.file.Paths.get(Unknown Source)
    at com.sora.util.walltoggle.pro.WebViewPresentation.setupTempFiles(WebViewPresentation.java:83)
   ....

这是我的 setupTempFiles的一小部分（包含行号）：

and this is a small part of my setupTempFiles(with line numbers):

81. URI uri = getClass().getResource("/webViewPresentation").toURI();
//prints: URI->jar:file:/C:/Users/Tom/Dropbox/WallTogglePro.jar!/webViewPresentation
82. System.out.println("URI->" + uri );
83. Path source = Paths.get(uri);

webViewPresentation 目录位于根目录我的罐子：

the webViewPresentation directory resides in the root directory of my jar:

此问题仅在我将应用程序打包为jar时退出，在Eclipse中进行调试没有问题。我怀疑这与此错误有关，但我是不确定如何纠正这个问题。

This problem only exits when I package my app as a jar, debugging in Eclipse has no problems. I suspect that this has something to do with this bug but I'm not sure how to correct this problem.

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如果事项：

我在使用Java 8 build 1.8.0-b132

I'm on Java 8 build 1.8.0-b132

Windows 7 Ult。 x64

Windows 7 Ult. x64

推荐答案

FileSystemNotFoundException 表示无法自动创建文件系统;并且你还没有在这里创建它。

A FileSystemNotFoundException means the file system cannot be created automatically; and you have not created it here.

鉴于你的URI，你应该做的是分解！，使用之前的部分打开文件系统，然后从之后的部分获取路径！：

Given your URI, what you should do is split against the !, open the filesystem using the part before it and then get the path from the part after the !:

final Map<String, String> env = new HashMap<>();
final String[] array = uri.toString().split("!");
final FileSystem fs = FileSystems.newFileSystem(URI.create(array[0]), env);
final Path path = fs.getPath(array[1]);

请注意，您应该 .close（）一旦你完成了它，你的文件系统。

Note that you should .close() your FileSystem once you're done with it.

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