Java IO & NIO - Files.getPosixFilePermissions() Examples

Java IO & NIO Java Java API 

Class:

java.nio.file.Files

Method:

public static Set<PosixFilePermission> getPosixFilePermissions(Path path,
                                                               LinkOption... options)
                                                        throws IOException

Returns a file's POSIX file permissions.

POSIX is a family of standards specified by the IEEE for maintaining compatibility between operating systems.

Note that not all O.S. support POSIX. For example Windows does not support it by default, in that case this method will throw UnsupportedOperationException

Parameters:

path - the path to the file

options - options indicating how symbolic links are handled

Returns:

the file permissions

Examples

Running in windows will throw UnsupportedOperationException:

package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.PosixFilePermission;
import java.util.Set;

public class GetPosixFilePermissionsExample {

    public static void main(String... args) throws IOException {
        System.out.println("OS: " + System.getProperty("os.name"));
        Path tempFile = Files.createTempFile("test-file", ".txt");
        Set<PosixFilePermission> posixFilePermissions = Files.getPosixFilePermissions(tempFile);
        posixFilePermissions.stream().forEach(System.out::println);
    }
}

Running in Linux Mint 18.1:

 OS: Linux
 OWNER_WRITE
 OWNER_READ