[英]How to get just the parent directory name of a specific file
如何从 test.java 所在的路径名中获取ddd
。
File file = new File("C:/aaa/bbb/ccc/ddd/test.java");
Use File
's getParentFile()
method and String.lastIndexOf()
to retrieve just the immediate parent directory.使用
File
的getParentFile()
方法和String.lastIndexOf()
仅检索直接父目录。
Mark's comment is a better solution than lastIndexOf()
: Mark 的评论是比
lastIndexOf()
更好的解决方案:
file.getParentFile().getName();
These solutions only works if the file has a parent file (eg, created via one of the file constructors taking a parent File
).这些解决方案仅在文件具有父文件时才有效(例如,通过采用父
File
的文件构造函数之一创建)。 When getParentFile()
is null you'll need to resort to using lastIndexOf
, or use something like Apache Commons' FileNameUtils.getFullPath()
:当
getParentFile()
为 null 时,您需要使用lastIndexOf
,或使用类似Apache Commons 的FileNameUtils.getFullPath()
:
FilenameUtils.getFullPathNoEndSeparator(file.getAbsolutePath());
=> C:/aaa/bbb/ccc/ddd
There are several variants to retain/drop the prefix and trailing separator.有几种变体可以保留/删除前缀和尾随分隔符。 You can either use the same
FilenameUtils
class to grab the name from the result, use lastIndexOf
, etc.您可以使用相同的
FilenameUtils
类从结果中获取名称,使用lastIndexOf
等。
File f = new File("C:/aaa/bbb/ccc/ddd/test.java");
System.out.println(f.getParentFile().getName())
f.getParentFile()
can be null, so you should check it. f.getParentFile()
可以为空,所以你应该检查它。
Use below,下面使用,
File file = new File("file/path");
String parentPath = file.getAbsoluteFile().getParent();
If you have just String path and don't want to create new File object you can use something like:如果您只有 String 路径并且不想创建新的 File 对象,则可以使用以下内容:
public static String getParentDirPath(String fileOrDirPath) {
boolean endsWithSlash = fileOrDirPath.endsWith(File.separator);
return fileOrDirPath.substring(0, fileOrDirPath.lastIndexOf(File.separatorChar,
endsWithSlash ? fileOrDirPath.length() - 2 : fileOrDirPath.length() - 1));
}
File file = new File("C:/aaa/bbb/ccc/ddd/test.java");
File curentPath = new File(file.getParent());
//get current path "C:/aaa/bbb/ccc/ddd/"
String currentFolder= currentPath.getName().toString();
//get name of file to string "ddd"
if you need to append folder "ddd" by another path use;如果您需要通过另一个路径使用附加文件夹“ddd”;
String currentFolder= "/" + currentPath.getName().toString();
From java 7 I would prefer to use Path.从 java 7 开始,我更喜欢使用 Path。 You only need to put path into:
您只需要将路径放入:
Path dddDirectoryPath = Paths.get("C:/aaa/bbb/ccc/ddd/test.java");
and create some get method:并创建一些获取方法:
public String getLastDirectoryName(Path directoryPath) {
int nameCount = directoryPath.getNameCount();
return directoryPath.getName(nameCount - 1);
}
In Groovy:在 Groovy 中:
There is no need to create a File
instance to parse the string in groovy.不需要创建
File
实例来解析 groovy 中的字符串。 It can be done as follows:可以按如下方式完成:
String path = "C:/aaa/bbb/ccc/ddd/test.java"
path.split('/')[-2] // this will return ddd
The split will create the array [C:, aaa, bbb, ccc, ddd, test.java]
and index -2
will point to entry before the last one, which in this case is ddd
拆分将创建数组
[C:, aaa, bbb, ccc, ddd, test.java]
并且索引-2
将指向最后一个之前的条目,在本例中为ddd
//get the parentfolder name
File file = new File( System.getProperty("user.dir") + "/.");
String parentPath = file.getParentFile().getName();
For Kotlin :对于科特林:
fun getFolderName() {
val uri: Uri
val cursor: Cursor?
uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
val projection = arrayOf(MediaStore.Audio.AudioColumns.DATA)
cursor = requireActivity().contentResolver.query(uri, projection, null, null, null)
if (cursor != null) {
column_index_data = cursor.getColumnIndexOrThrow(MediaStore.Audio.AudioColumns.DATA)
}
while (cursor!!.moveToNext()) {
absolutePathOfImage = cursor.getString(column_index_data)
val fileName: String = File(absolutePathOfImage).parentFile.name
}
}
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