如何通过Java调整文件所有者及权限设置？

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这篇文章主要介绍了如何使用Java修改文件的所有者和权限。文中通过示例代码展示了非详细的操作步骤，对于想深入了解的读者，具有一定的参考价值。以下是一些学习或工作的参考：

1. 设置所有者和管理权限

示例代码： java // 设置文件所有者 File file=new File(path/to/file); String owner=newOwner; boolean success=file.setOwner(owner); if (success) { System.out.println(文件所有者设置成功); } else { System.out.println(文件所有者设置失败); }

// 设置文件权限 boolean setReadable=file.setReadable(true); boolean setWritable=file.setWritable(true); boolean setExecutable=file.setExecutable(true);

if (setReadable && setWritable && setExecutable) { System.out.println(文件权限设置成功); } else { System.out.println(文件权限设置失败); }

这篇文章主要介绍了如何使用java修改文件所有者及其权限,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

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

（2）为指定用户添加新的ACL条目

e:/test1.txt为用户abc添加DATA_READ和DATA_ WRITE权限

import java.io.IOException; 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.*; import java.util.EnumSet; import java.util.List; import java.util.Set; import static java.nio.file.attribute.AclEntryPermission.READ_DATA; import static java.nio.file.attribute.AclEntryPermission.WRITE_DATA; 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 { UserPrincipal bRiceUser = FileSystems.getDefault() .getUserPrincipalLookupService().lookupPrincipalByName("abc"); Set<AclEntryPermission> permissions = EnumSet.of(READ_DATA, WRITE_DATA); AclEntry.Builder builder = AclEntry.newBuilder(); builder.setPrincipal(bRiceUser); builder.setType(AclEntryType.ALLOW); builder.setPermissions(permissions); AclEntry newEntry = builder.build(); List<AclEntry> aclEntries = aclView.getAcl(); aclEntries.add(newEntry); aclView.setAcl(aclEntries); }catch (IOException e){ e.printStackTrace(); } } }

输出结果比刚才多了

Principal: hkgi-PC\abc (User) Type: ALLOW Permissions are: WRITE_DATA READ_DATA

3.POSIX文件权限

UNIX支持POSIX标准文件属性

PosixFilePermission枚举类型定义九个常量，每个权限组件一个。

九个常数命名为X_Y，其中X是OWNER，GROUP和OTHERS，Y是READ，WRITE和EXECUTE。

PosixFilePermissions的toString()方法将一组PosixFilePermission枚举常量转换为rwxrwxrwx形式的字符串

PosixFileAttributeView的setPermissions()方法用来设置权限

（1）输出/www/test1.txt的权限

import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.attribute.*; import java.util.Set; public class Main { public static void main(String[] args) { Path path = Paths.get("/www/test1.txt"); PosixFileAttributeView posixView = Files.getFileAttributeView(path, PosixFileAttributeView.class); try{ PosixFileAttributes attribs = posixView.readAttributes(); Set<PosixFilePermission> permissions = attribs.permissions(); // Convert the file permissions into the rwxrwxrwx string form String rwxFormPermissions = PosixFilePermissions.toString(permissions); // Print the permissions System.out.println(rwxFormPermissions); }catch (IOException e){ e.printStackTrace(); } } }

输出结果

rw-r--r--

（2）读取和更新名为test的文件权限

import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.attribute.*; import java.util.EnumSet; import java.util.Set; import static java.nio.file.attribute.PosixFilePermission.*; public class Main { public static void main(String[] args) { Path path = Paths.get("/www/test1.txt"); PosixFileAttributeView posixView = Files.getFileAttributeView(path, PosixFileAttributeView.class); if (posixView == null) { System.out.format("POSIX attribute view is not supported%n."); return; } System.out.println("old:"); readPermissions(posixView); updatePermissions(posixView); System.out.println("new:"); readPermissions(posixView); } public static void readPermissions(PosixFileAttributeView posixView) { try{ PosixFileAttributes attribs; attribs = posixView.readAttributes(); Set<PosixFilePermission> permissions = attribs.permissions(); // Convert the set of posix file permissions into rwxrwxrwx form String rwxFormPermissions = PosixFilePermissions.toString(permissions); System.out.println(rwxFormPermissions); }catch (IOException e){ e.printStackTrace(); } } public static void updatePermissions(PosixFileAttributeView posixView) { try { Set<PosixFilePermission> permissions = EnumSet.of(OWNER_READ, OWNER_WRITE,OWNER_EXECUTE, GROUP_READ,GROUP_WRITE); posixView.setPermissions(permissions); System.out.println("Permissions set successfully."); }catch (IOException e){ e.printStackTrace(); } } }

输出结果

old: rw-r----- Permissions set successfully. new: rwxrw----

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持易盾网络。