[英]Java: how to normalize paths with nio Path?
One of the really nice things about java.io.File
is that it can normalize paths to a predictable format . 关于java.io.File
一个非常好的事情是它可以将路径规范化为可预测的格式 。
new File("/", inputPath).getPath()
always returns a string with relative paths normalized out, and always starting and ending with predictable path separators. new File("/", inputPath).getPath()
始终返回一个字符串,其相对路径已标准化,并始终以可预测的路径分隔符开头和结尾。
Is there a way to do this with the new nio Path
or Paths
classes? 有没有办法用新的nio Path
或Paths
类做到这一点?
(Note also that I am dealing with abstract paths for other systems, this has nothing to do with any local filesystem) (另请注意,我正在处理其他系统的抽象路径,这与任何本地文件系统无关)
Further examples of behavior I want: 我想要的更多行为示例:
- "/foo" -> "/foo"
- "//foo/" -> "/foo"
- "foo/" -> "/foo"
- "foo/bar" -> "/foo/bar"
- "foo/bar/../baz" -> "/foo/baz"
- "foo//bar" -> "/foo/bar"
This code works: 此代码有效:
public final class Foo
{
private static final List<String> INPUTS = Arrays.asList(
"/foo", "//foo", "foo/", "foo/bar", "foo/bar/../baz", "foo//bar"
);
public static void main(final String... args)
{
Path path;
for (final String input: INPUTS) {
path = Paths.get("/", input).normalize();
System.out.printf("%s -> %s\n", input, path);
}
}
}
Output: 输出:
/foo -> /foo
//foo -> /foo
foo/ -> /foo
foo/bar -> /foo/bar
foo/bar/../baz -> /foo/baz
foo//bar -> /foo/bar
NOTE however that this is NOT portable. 但请注意,这不是便携式的。 It won't work on Windows machines... 它不适用于Windows机器......
If you want a portable solution you can use memoryfilesystem , open a Unix filesystem and use that: 如果你想要一个可移植的解决方案,你可以使用memoryfilesystem ,打开一个Unix文件系统并使用它:
try (
final FileSystem fs = MemoryFileSystem.newLinux().build();
) {
// path operations here
}
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