Get POSIX file attributes in Java

POSIX stands for Portable Operating System Interface, it is a set of standard operating system interfaces based on the Unix operating system. POSIX standardizes set of guidelines to ease the task of cross-platform software development. You can refer this link for more information on POSIX.

 

How to get POSIX file attributes in Java?

Below snippet return the POSIX attributes in Java.

filePath
.getFileSystem()
.provider()
.getFileAttributeView(filePath, PosixFileAttributeView.class, LinkOption.NOFOLLOW_LINKS)
.readAttributes();

 

Find the below working application.

PosixFileAttributesDemo.java

package com.sample.app.files;

import java.io.File;
import java.io.IOException;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.attribute.FileTime;
import java.nio.file.attribute.PosixFileAttributeView;
import java.nio.file.attribute.PosixFileAttributes;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.UserPrincipal;
import java.util.Objects;
import java.util.Set;

public class PosixFileAttributesDemo {

	public static final PosixFileAttributes getPosixAttributes(final String filePath) throws IOException {
		Objects.requireNonNull(filePath, "filePath is null");
		return getPosixAttributes(new File(filePath));
	}

	public static final PosixFileAttributes getPosixAttributes(final File filePath) throws IOException {
		Objects.requireNonNull(filePath, "filePath is null");
		return getPosixAttributes(filePath.toPath());

	}

	public static final PosixFileAttributes getPosixAttributes(final Path filePath) throws IOException {
		Objects.requireNonNull(filePath, "filePath is null");

		return filePath.getFileSystem().provider()
				.getFileAttributeView(filePath, PosixFileAttributeView.class, LinkOption.NOFOLLOW_LINKS)
				.readAttributes();
	}

	public static void main(String[] args) throws IOException {
		final String filePath = "/Users/Shared/filePrograms/a.txt";

		final PosixFileAttributes posixFileAttributes = getPosixAttributes(filePath);

		final FileTime creationTime = posixFileAttributes.creationTime();
		final Object fileKey = posixFileAttributes.fileKey();
		final boolean isDirectiory = posixFileAttributes.isDirectory();
		final boolean isRegularFile = posixFileAttributes.isRegularFile();
		final boolean isSymbolicLink = posixFileAttributes.isSymbolicLink();
		final FileTime lastAccessTime = posixFileAttributes.lastAccessTime();
		final FileTime lastModifiedTime = posixFileAttributes.lastModifiedTime();
		final UserPrincipal owner = posixFileAttributes.owner();
		final Set<PosixFilePermission> permissions = posixFileAttributes.permissions();
		final long fileSizeInBytes = posixFileAttributes.size();

		System.out.println("creationTime : " + creationTime);
		System.out.println("fileKey : " + fileKey);
		System.out.println("isDirectiory : " + isDirectiory);
		System.out.println("isRegularFile : " + isRegularFile);
		System.out.println("isSymbolicLink : " + isSymbolicLink);
		System.out.println("lastAccessTime : " + lastAccessTime);
		System.out.println("lastModifiedTime : " + lastModifiedTime);
		System.out.println("owner : " + owner);
		System.out.println("fileSizeInBytes : " + fileSizeInBytes);

		System.out.println("File permissions : ");
		for (final PosixFilePermission permission : permissions) {
			System.out.println("  " + permission);
		}

	}

}

 

Output

creationTime : 2023-01-07T15:41:28Z
fileKey : (dev=1000004,ino=37049869)
isDirectiory : false
isRegularFile : true
isSymbolicLink : false
lastAccessTime : 2023-01-07T15:41:30Z
lastModifiedTime : 2023-01-07T15:41:28Z
owner : krishna
fileSizeInBytes : 12
File permissions : 
  OWNER_WRITE
  OTHERS_READ
  OWNER_READ
  GROUP_READ

 

 

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