[英]In Java 7, list files with "relative path"
Given the below directory structure:鉴于以下目录结构:
/dir1
/dir1/dir2
/dir1/dir2/file1
/dir1/dir2/file2
/dir1/dir2/dirA/file3
someFunction("dir2") someFunction("dir2")
desired output:所需的输出:
dir2/file1
dir2/file2
dir2/dirA/file3
I am using FileUtils.listFiles and Paths and then String manipulation, but wondering if better way.我正在使用 FileUtils.listFiles 和 Paths,然后使用字符串操作,但想知道是否有更好的方法。 Just seems convoluted.只是看起来很复杂。
The Unix command find dir2 is pretty spot on. Unix 命令find dir2非常合适。
You have a base directory and a Collection<File>
.您有一个基本目录和一个Collection<File>
。 You can use Path.relativize
to get the relative path from one to the other.您可以使用Path.relativize
获取从一个到另一个的相对路径。
This example, given /dir1
and /dir1/foo/bar/baz
, will result in foo/bar/baz
without any fragile string operations:这个例子,给定/dir1
和/dir1/foo/bar/baz
,将导致foo/bar/baz
没有任何脆弱的字符串操作:
import java.io.*;
import java.nio.file.*;
class Foo {
public static void main(String[] args) throws Exception {
Path base = Paths.get("/dir1");
File f = new File("/dir1/foo/bar/baz");
System.out.println(base.relativize(f.toPath()));
}
}
Since you're using the Java 7 Path
, you might as well use the Java 7 Files
too.由于您使用的是 Java 7 Path
,您也可以使用 Java 7 Files
。
static void someFunction(String dir) throws IOException {
Files.walkFileTree(Paths.get(dir), new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
System.out.println(file);
return FileVisitResult.CONTINUE;
}
});
}
Test测试
someFunction("dir2");
Output (on Windows 1 )输出(在 Windows 1 上)
dir2\dirA\file3
dir2\file1
dir2\file2
1) On Linux, the paths would have forward slash instead of backslash. 1) 在 Linux 上,路径会有正斜杠而不是反斜杠。
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