NIO2: Working with FileStore object

FileStore object represents a storage pool, device, partition, volume, concrete file system or other implementation specific means of file storage.

How to get an instance of Filestore object?

Files class provides 'getFileStore' method, it is used to get the file store where a file is located.

Example

FileStore fileStore = Files.getFileStore(Paths.get("/Users"));

App.java

package com.sample.app;

import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {

 public static void main(String args[]) throws IOException {

  FileStore fileStore = Files.getFileStore(Paths.get("/Users"));

  System.out.println("Name : " + fileStore.name());
  System.out.println("Type : " + fileStore.type());
  System.out.println("Total Space : " + fileStore.getTotalSpace() + " bytes");
  System.out.println("Unallocated Space : " + fileStore.getUnallocatedSpace() + " bytes");
  System.out.println("Unallocated Space : " + fileStore.getUsableSpace() + " bytes");

  System.out.println("---------------------------\n");

 }
}

Sample Output

Name : /dev/disk1s1

Type : apfs

Total Space : 499963174912 bytes

Unallocated Space : 354025279488 bytes

Unallocated Space : 347387514880 bytes

---------------------------

How to get all the FileStore objects available for given FileSystem?

FileSystem class provides 'getFileStores' method, it returns an iterableobject to iterate over the underlying file stores.

Example

FileSystem fileSystem = FileSystems.getFileSystem(URI.create("file:///"));

Iterable<FileStore> fileStores = fileSystem.getFileStores();

App.java

package com.sample.app;

import java.io.IOException;
import java.net.URI;
import java.nio.file.FileStore;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;

public class App {

 public static void main(String args[]) throws IOException {

  FileSystem fileSystem = FileSystems.getFileSystem(URI.create("file:///"));

  Iterable<FileStore> fileStores = fileSystem.getFileStores();

  for (FileStore fileStore : fileStores) {
   System.out.println("Name : " + fileStore.name());
   System.out.println("Type : " + fileStore.type());
   System.out.println("Total Space : " + fileStore.getTotalSpace() + " bytes");
   System.out.println("Unallocated Space : " + fileStore.getUnallocatedSpace() + " bytes");
   System.out.println("Unallocated Space : " + fileStore.getUsableSpace() + " bytes");

   System.out.println("---------------------------\n");
  }

 }
}

Sample Output

Name : /dev/disk1s1

Type : apfs

Total Space : 499963174912 bytes

Unallocated Space : 354038947840 bytes

Unallocated Space : 347401183232 bytes

---------------------------

Name : devfs

Type : devfs

Total Space : 192000 bytes

Unallocated Space : 0 bytes

Unallocated Space : 0 bytes

---------------------------

Name : /dev/disk1s4

Type : apfs

Total Space : 499963174912 bytes

Unallocated Space : 494594437120 bytes

Unallocated Space : 347401183232 bytes

---------------------------

Name : map -hosts

Type : autofs

Total Space : 0 bytes

Unallocated Space : 0 bytes

Unallocated Space : 0 bytes

---------------------------

Name : map auto_home

Type : autofs

Total Space : 0 bytes

Unallocated Space : 0 bytes

Unallocated Space : 0 bytes

---------------------------

Name : /dev/disk2s1

Type : hfs

Total Space : 77553664 bytes

Unallocated Space : 45424640 bytes

Unallocated Space : 45424640 bytes

---------------------------

Name : /dev/disk1s3

Type : apfs

Total Space : 499963174912 bytes

Unallocated Space : 498924687360 bytes

Unallocated Space : 347401183232 bytes

---------------------------

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