从资源文件夹获取文件时，java.nio.file.FileSystemNotFoundException [英] java.nio.file.FileSystemNotFoundException when getting file from resources folder

问题描述

我在以下代码上遇到此错误(请注意，这不会在本地计算机上发生，仅在我的构建服务器上发生):

I am getting this error on the following code (note that this does not happen on my local machine, only on my build server):

Files.readAllBytes(Paths.get(getClass().getResource("/elasticsearch/segmentsIndex.json").toURI()), Charset.defaultCharset());

还有一个例外:

Caused by: java.nio.file.FileSystemNotFoundException: null
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(Paths.java:143)

我试图通过遵循以下解决方案来解决此问题；我的代码现在看起来像这样:

I tried to fix it by following this solution; my code now looks like this:

URI segmentsIndexURI = getClass().getResource("/elasticsearch/segmentsIndex.json").toURI();
Map<String, String> env = new HashMap<>(); 
env.put("create", "true");
FileSystem zipfs = FileSystems.newFileSystem(segmentsIndexURI, env); //exception here
Path segmentsIndexPath = Paths.get(segmentsIndexURI);

我遇到以下异常:

java.lang.IllegalArgumentException: Path component should be '/'
at sun.nio.fs.UnixFileSystemProvider.checkUri(UnixFileSystemProvider.java:77)
at sun.nio.fs.UnixFileSystemProvider.newFileSystem(UnixFileSystemProvider.java:86)
at java.nio.file.FileSystems.newFileSystem(FileSystems.java:326)
at java.nio.file.FileSystems.newFileSystem(FileSystems.java:276)

似乎没有任何作用. 我应该如何建立文件的路径?

Nothing seems to work. How am I supposed to build the path to the file?

推荐答案

不要尝试访问文件之类的资源.只需抓住InputStream并从那里读取数据:

Don't try to access a resource like a file. Just grab the InputStream and read the data from there:

byte[] data;
try (InputStream in = getClass().getResourceAsStream("/elasticsearch/segmentsIndex.json")) {
    data = in.readAllBytes​(); // usable in Java 9+
    // data = IOUtils.toByteArray(in); // uses Apache commons IO library
}

此示例使用Apache commons-io库中的IOUtils类.

This example uses the IOUtils class from Apache commons-io library.

如果您的目标是Java 9+，则可以选择使用data = in.readAllBytes​();.

If you are targeting Java 9+ you can alternatively use data = in.readAllBytes​();.

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