java修改文件所有者及其权限

1.设置所有者

管理文件所有者

Files.getOwner()和Files.setOwner()方法

要使用UserPrincipal来管理文件的所有者

（1）更改文件的所有者

import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.FileOwnerAttributeView;
import java.nio.file.attribute.UserPrincipal;
import java.nio.file.attribute.UserPrincipalLookupService;

public class Main {
    public static void main(String[] args) {

        Path path = Paths.get("/www/test1.txt");

        FileOwnerAttributeView foav = Files.getFileAttributeView(path,
                FileOwnerAttributeView.class);
        try {
            UserPrincipal owner = foav.getOwner();
            System.out.format("Original owner  of  %s  is %s%n", path,
                    owner.getName());

            FileSystem fs = FileSystems.getDefault();
            UserPrincipalLookupService upls = fs.getUserPrincipalLookupService();

            UserPrincipal newOwner = upls.lookupPrincipalByName("abc");
            foav.setOwner(newOwner);

            UserPrincipal changedOwner = foav.getOwner();
            System.out.format("New owner  of  %s  is %s%n", path,
                    changedOwner.getName());

        }catch (IOException e){
            e.printStackTrace();
        }

    }
}

输出

查看文件详细信息

2.ACL文件权限

Windows上支持ACL类型文件属性

使用AclFileAttributeView的

　　getAcl()方法获取文件的AclEntry列表

　　setAcl()方法设置文件的AclEntry列表

（1）读取文件e:/test1.txt的ACL条目

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.AclEntry;
import java.nio.file.attribute.AclEntryPermission;
import java.nio.file.attribute.AclFileAttributeView;
import java.util.List;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
       
        Path path = Paths.get("e:/test1.txt");
        AclFileAttributeView aclView = Files.getFileAttributeView(path,
                AclFileAttributeView.class);
        if (aclView == null) {
            System.out.format("ACL view  is not  supported.%n");
            return;
        }
        try {
            List<AclEntry> aclEntries = aclView.getAcl();
            for (AclEntry entry : aclEntries) {
                System.out.format("Principal: %s%n", entry.principal());
                System.out.format("Type: %s%n", entry.type());
                System.out.format("Permissions are:%n");

                Set<AclEntryPermission> permissions = entry.permissions();
                for (AclEntryPermission p : permissions) {
                    System.out.format("%s %n", p);
                }

            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

输出结果为

Principal: BUILTIN\Administrators (Alias)
Type: ALLOW
Permissions are:
WRITE_DATA 
WRITE_OWNER 
APPEND_DATA 
SYNCHRONIZE 
WRITE_ATTRIBUTES 
EXECUTE 
READ_DATA 
DELETE_CHILD 
READ_ATTRIBUTES 
WRITE_NAMED_ATTRS 
WRITE_ACL 
DELETE 
READ_ACL 
READ_NAMED_ATTRS 
Principal: NT AUTHORITY\SYSTEM (Well-known group)
Type: ALLOW
Permissions are:
WRITE_DATA 
WRITE_OWNER 
APPEND_DATA 
SYNCHRONIZE 
WRITE_ATTRIBUTES 
EXECUTE 
READ_DATA 
DELETE_CHILD 
READ_ATTRIBUTES 
WRITE_NAMED_ATTRS 
WRITE_ACL 
DELETE 
READ_ACL 
READ_NAMED_ATTRS 
Principal: NT AUTHORITY\Authenticated Users (Well-known group)
Type: ALLOW
Permissions are:
WRITE_DATA 
READ_ATTRIBUTES 
APPEND_DATA 
WRITE_NAMED_ATTRS 
SYNCHRONIZE 
WRITE_ATTRIBUTES 
EXECUTE 
DELETE 
READ_DATA 
READ_ACL 
READ_NAMED_ATTRS 
Principal: BUILTIN\Users (Alias)
Type: ALLOW
Permissions are:
READ_ATTRIBUTES 
SYNCHRONIZE 
EXECUTE 
READ_DATA 
READ_ACL 
READ_NAMED_ATTRS 

View Code