Java 如何使用 File 对象获取文件的目录？

How do I get a file's directory using the File object?

提问by Koerr

Consider the code:

考虑代码：

File file = new File("c:\temp\java\testfile");

testfileis a file, and it may or may not exist. I want to get the directory c:\\temp\\java\\using the Fileobject. How do I go about doing this?

testfile是一个文件，它可能存在也可能不存在。我想c:\\temp\\java\\使用该File对象获取目录。我该怎么做？

采纳答案by Jon Skeet

In either case, I'd expect file.getParent()(or file.getParentFile()) to give you what you want.

在任何一种情况下，我都希望file.getParent()（或file.getParentFile()）给你你想要的。

Additionally, if you want to find out whether the original Filedoesexist and isa directory, then exists()and isDirectory()are what you're after.

此外，如果您想确定原始文件File是否存在并且是一个目录，那么exists()和isDirectory()就是您所追求的。

回答by Joel

File.getParent()from Java Documentation

Java 文档中的File.getParent()

回答by YoK

File API File.getParentor File.getParentFileshould return you Directory of file.

文件 API File.getParent或File.getParentFile应该返回您的文件目录。

Your code should be like :

你的代码应该是这样的：

    File file = new File("c:\temp\java\testfile");
    if(!file.exists()){
        file = file.getParentFile();
    }

You can additionally check your parent file is directory using File.isDirectoryAPI

您还可以使用File.isDirectoryAPI检查您的父文件是目录

if(file.isDirectory()){
    System.out.println("file is directory ");
}

回答by Jigar Joshi

File directory = new File("Enter any 
                directory name or file name");
boolean isDirectory = directory.isDirectory();
if (isDirectory) {
  // It returns true if directory is a directory.
  System.out.println("the name you have entered 
         is a directory  : "  +    directory);  
  //It returns the absolutepath of a directory.
  System.out.println("the path is "  + 
              directory.getAbsolutePath());
} else {
  // It returns false if directory is a file.
  System.out.println("the name you have
   entered is a file  : " +   directory);
  //It returns the absolute path of a file.
  System.out.println("the path is "  +  
            file.getParent());
}

File directory = new File("Enter any 
                directory name or file name");
boolean isDirectory = directory.isDirectory();
if (isDirectory) {
  // It returns true if directory is a directory.
  System.out.println("the name you have entered 
         is a directory  : "  +    directory);  
  //It returns the absolutepath of a directory.
  System.out.println("the path is "  + 
              directory.getAbsolutePath());
} else {
  // It returns false if directory is a file.
  System.out.println("the name you have
   entered is a file  : " +   directory);
  //It returns the absolute path of a file.
  System.out.println("the path is "  +  
            file.getParent());
}

回答by Lovenish Goyal

File filePath=new File("your_file_path");
String dir="";
if (filePath.isDirectory())
{
    dir=filePath.getAbsolutePath();
}
else
{
    dir=filePath.getAbsolutePath().replaceAll(filePath.getName(), "");
}

回答by Saurabh

You can use this

你可以用这个

 File dir=new File(TestMain.class.getClassLoader().getResource("filename").getPath());

回答by C.Ikongo

I found this more useful for getting the absolute file location.

我发现这对于获取绝对文件位置更有用。

File file = new File("\TestHello\test.txt");
System.out.println(file.getAbsoluteFile());

回答by Ponaguynik

If you do something like this:

如果你做这样的事情：

File file = new File("test.txt");
String parent = file.getParent();

parentwill be null.

parent将为空。

So to get directory of this file you can do next:

因此，要获取此文件的目录，您可以执行以下操作：

parent = file.getAbsoluteFile().getParent();

回答by nobes

String parentPath = f.getPath().substring(0, f.getPath().length() - f.getName().length()); 

This would be my solution

这将是我的解决方案