Test.java Source code

Introduction

Here is the source code for Test.java

Source

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());
    }
}