Set group Principal : File Attribute « JDK 7 « Java

1. Java
2. JDK 7
3. File Attribute

Set group Principal

import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.GroupPrincipal;
import java.nio.file.attribute.PosixFileAttributeView;
import java.nio.file.attribute.PosixFileAttributes;
import java.nio.file.attribute.UserPrincipal;
import java.nio.file.attribute.UserPrincipalLookupService;

public class Test {

  public static void main(String[] args) throws Exception {
    Path path = Paths.get("home/docs/users.txt");
    setGroupPrincipal(path, "A", "B");
  }
  private static void setGroupPrincipal(Path path, String userName,
      String groupName) throws Exception {
    System.out.println("Setting owner for " + path.getFileName());
    PosixFileAttributeView view = Files.getFileAttributeView(path,
        PosixFileAttributeView.class);

    PosixFileAttributes attributes = view.readAttributes();
    System.out.println("Old Group: " + attributes.group().getName());
    System.out.println("Old Owner: " + attributes.owner().getName());

    UserPrincipalLookupService lookupService = FileSystems.getDefault()
        .getUserPrincipalLookupService();
    UserPrincipal userPrincipal = lookupService.lookupPrincipalByName(userName);
    GroupPrincipal groupPrincipal = lookupService
        .lookupPrincipalByGroupName(groupName);
    view.setGroup(groupPrincipal);
    view.setOwner(userPrincipal);

    attributes = view.readAttributes();
    System.out.println("New Group: " + attributes.group().getName());
    System.out.println("New Owner: " + attributes.owner().getName());
  }
}

 

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