java set file permissions to 777 while creating a file object

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How can I set the umask from within java?

How do you set file permissions to 777(or any other arbitrary permission) while creating a file object in java?

In JDK7 you can use Files.setPosixFilePermissions to change the file permissions to whatever you want. If you need the permissions set atomically when creating the file then you can do that too. — Alan, Jun 07 '11 at 13:14

score 24 · Answer 1 · edited Jul 22 '14 at 19:04

24

3 methods are available:

setReadalble(boolean boolean)
setWritable(boolean,boolean)
setExecutable(boolean,boolean)

This will set the file to "0777"

String path = "SOME/PATH";

final File file = new File(path);
file.setReadable(true, false);
file.setExecutable(true, false);
file.setWritable(true, false);

edited Jul 22 '14 at 19:04

Jared Burrows

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answered Jun 03 '11 at 23:23

ratchet freak

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it is not working for me..can u help? – Bhavik Patel Jun 07 '15 at 07:18
Yes this does not works for files on RH Linux – Jay Jan 06 '17 at 11:47
If this way doesn't work for you, you can try the solution given by Stephen Ostermiller https://stackoverflow.com/a/6233604/5361779 – B378 Nov 30 '18 at 03:43

score 24 · Answer 2 · edited Dec 27 '17 at 10:06

Java SE 7 has java.nio.file.attribute.PosixFileAttributes which gives you fine grained control over read, write, and execute permissions for owner, group, and others.

import java.nio.file.*;
import java.nio.file.attribute.*;
import java.util.Set;

public class Test {
    public static void main(String[] args) throws Exception {
        Path path = Paths.get("/tmp/test-file.txt");
        if (!Files.exists(path)) Files.createFile(path);
        Set<PosixFilePermission> perms = Files.readAttributes(path,PosixFileAttributes.class).permissions();

        System.out.format("Permissions before: %s%n",  PosixFilePermissions.toString(perms));

        perms.add(PosixFilePermission.OWNER_WRITE);
        perms.add(PosixFilePermission.OWNER_READ);
        perms.add(PosixFilePermission.OWNER_EXECUTE);
        perms.add(PosixFilePermission.GROUP_WRITE);
        perms.add(PosixFilePermission.GROUP_READ);
        perms.add(PosixFilePermission.GROUP_EXECUTE);
        perms.add(PosixFilePermission.OTHERS_WRITE);
        perms.add(PosixFilePermission.OTHERS_READ);
        perms.add(PosixFilePermission.OTHERS_EXECUTE);
        Files.setPosixFilePermissions(path, perms);

        System.out.format("Permissions after:  %s%n",  PosixFilePermissions.toString(perms));
    }
}

Which can then be used like:

$ rm -f /tmp/test-file.txt && javac Test.java && java Test
Permissions before: rw-r--r--
Permissions after:  rwxrwxrwx

score 16 · Accepted Answer · answered Jun 03 '11 at 23:21

If you set the umask(2) to 0 before starting the JVM, all files and directories created will be created with full permissions for everyone. This is probably a bad idea.

You can use the File.setReadable(), File.setWritable APIs to fiddle with the mode bits after the file has been created. That's often good enough, if you're granting permissions; if you're trying to remove permissions from other users, then your permissions should probably be set very restrictively from the start. (umask(0777) before launching the JVM, then add permissions exactly where you want them.)

java set file permissions to 777 while creating a file object

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