Java PosixFileAttributeView set file permission

Introduction

The following table lists the PosixFilePermission enumeration values:

ValueLevel Permission Granted
GROUP_EXECUTEGroup Execute and search
GROUP_READGroup Read
GROUP_WRITE Group Write
OTHERS_EXECUTE Others Execute and search
OTHERS_READ OthersRead
OTHERS_WRITE Others Write
OWNER_EXECUTEOwner Execute and search
OWNER_READOwner Read
OWNER_WRITE Owner Write 
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.PosixFileAttributeView;
import java.nio.file.attribute.PosixFileAttributes;
import java.nio.file.attribute.PosixFilePermission;
import java.util.Set;

public class Main {

   public static void main(String[] args) {
      Path path = Paths.get("home/docs/users.txt");
      listPermissions(path);//from   ww  w  .  j  av a2  s .  c o  m
      setPermission(path, PosixFilePermission.OWNER_EXECUTE);
   }

   private static void setPermission(Path path, PosixFilePermission permission) {
      try {
         System.out.println("\nSetting permission for " + path.getFileName());
         PosixFileAttributeView view = Files.getFileAttributeView(path, PosixFileAttributeView.class);

         PosixFileAttributes attributes = view.readAttributes();

         Set<PosixFilePermission> permissions = attributes.permissions();
         permissions.add(permission);

         view.setPermissions(permissions);
         System.out.println();
      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }

   private static void listPermissions(Path path) {
      try {
         System.out.println("Permission for " + path.getFileName());
         PosixFileAttributeView view = Files.getFileAttributeView(path, PosixFileAttributeView.class);
         PosixFileAttributes attributes = view.readAttributes();
         System.out.println("Group: " + attributes.group().getName());
         System.out.println("Owner: " + attributes.owner().getName());
         Set<PosixFilePermission> permissions = attributes.permissions();
         System.out.print("Permissions: ");
         for (PosixFilePermission permission : permissions) {
            System.out.print(permission.name() + " ");
         }
         System.out.println();
      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }

}

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

public class Main {
  public static void main(String[] args) {
    Path path = Paths.get("Main.java");
    PosixFileAttributeView posixView = Files.getFileAttributeView(path,
        PosixFileAttributeView.class);
    if (posixView == null) {
      System.out.println("POSIX attribute view is not supported.");
      return;/* w  w w  .j a va 2  s .c  o m*/
    }

    try {
      Set<PosixFilePermission> permissions = EnumSet.of(
          PosixFilePermission.OWNER_READ,
          PosixFilePermission.OWNER_WRITE,
          PosixFilePermission.GROUP_READ);
      posixView.setPermissions(permissions);
      System.out.println("Permissions set successfully.");
    } catch (IOException ex) {
      ex.printStackTrace();
    }
  }
}



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