Java'da PosixFilePermission kullanarak bir Dosyada Dosya İzni Nasıl Ayarlanır? chmod komutunu anlama
Yayınlanan: 2021-06-28
Java'da Dosya İzni nasıl ayarlanır? Sağlanan herhangi bir dosyada dosya izni ayarlamanın basit bir örneği.
Herhangi bir şirketin Operasyon iş biriminin parçasıysanız, dağıtım iş akışını, analiz iş akışını vb. otomatikleştirmek çok önemlidir.
Bazı komutları çalıştırmayı denerseniz ve bir şekilde verilen dosya için komut dosyasını yürütme izniniz yoksa, Java programınız bazen istisna olarak çıkar.
Bizim durumumuzda, bu Crunchify.sh dosyasıdır.
İşte herhangi bir dosyada Dosya İzninin nasıl kurulacağını gösteren basit bir Java Programı.
CrunchifySetFilePermission.java
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package crunchify . com . java . tutorials ; import java . io . IOException ; import java . nio . file . Files ; import java . nio . file . Paths ; import java . nio . file . attribute . PosixFilePermission ; import java . util . HashSet ; import java . util . Set ; import java . io . File ; /** * @author Crunchify.com * In Java how to Set File Permission on a File using PosixFilePermission? Understanding chmod command. */ public class CrunchifySetFilePermission { public static void main ( String [ ] args ) { // File class: An abstract representation of file and directory pathnames. // User interfaces and operating systems use system-dependent pathname strings to name files and directories. // This class presents an abstract, system-independent view of hierarchical pathnames. File file = new File ( "/Users/app/Download/crunchify.txt" ) ; /* -------------------------- Set Permission: 455 ----------------------- */ // A convenience method to set the owner's execute permission for this abstract pathname. // On some platforms it may be possible to start the Java virtual machine with special privileges that allow it to execute files that are not marked executable. file . setExecutable ( false ) ; // public boolean setExecutable(boolean executable) // A convenience method to set the owner's read permission for this abstract pathname. // On some platforms it may be possible to start the Java virtual machine with special privileges that allow it to read files that are marked as unreadable. file . setReadable ( false ) ; // A convenience method to set the owner's write permission for this abstract pathname. // On some platforms it may be possible to start the Java virtual machine with special privileges that allow it to modify files that disallow write operations. file . setWritable ( true ) ; /* -------------------------- Set Permission: 777 ----------------------- */ // public boolean setExecutable(boolean executable, boolean ownerOnly) file . setExecutable ( true , false ) ; file . setReadable ( true , false ) ; file . setWritable ( true , false ) ; // using PosixFilePermission to set file permissions 777. PosixFilePermission - defines the bits for use with the permissions attribute. // The PosixFilePermissions class defines methods for manipulating set of permissions // HashSet: Constructs a new, empty set; the backing HashMap instance has default initial capacity (16) and load factor (0.75). Set < PosixFilePermission > crunchifyPermissions = new HashSet < PosixFilePermission > ( ) ; // add() Adds the specified element to this set if it is not already present (optional operation). // More formally, adds the specified element e to this set if the set contains no element e2 such that Objects.equals(e, e2). // If this set already contains the element, the call leaves the set unchanged and returns false. // In combination with the restriction on constructors, this ensures that sets never contain duplicate elements. /* -------------------------- OWNER Permissions ----------------------- */ // Read permission, owner. crunchifyPermissions . add ( PosixFilePermission . OWNER_READ ) ; // Write permission, owner. crunchifyPermissions . add ( PosixFilePermission . OWNER_WRITE ) ; // Execute/search permission, owner. crunchifyPermissions . add ( PosixFilePermission . OWNER_EXECUTE ) ; /* -------------------------- GROUP Permissions ----------------------- */ // PosixFilePermission: Defines the bits for use with the permissions attribute. // The PosixFilePermissions class defines methods for manipulating set of permissions. // Read permission, group. crunchifyPermissions . add ( PosixFilePermission . GROUP_READ ) ; // Write permission, group. crunchifyPermissions . add ( PosixFilePermission . GROUP_WRITE ) ; // Execute/search permission, group. crunchifyPermissions . add ( PosixFilePermission . GROUP_EXECUTE ) ; /* -------------------------- OTHERS Permissions ----------------------- */ // Read permission, others. crunchifyPermissions . add ( PosixFilePermission . OTHERS_READ ) ; // Write permission, others. crunchifyPermissions . add ( PosixFilePermission . OTHERS_WRITE ) ; // Execute/search permission, others. crunchifyPermissions . add ( PosixFilePermission . OTHERS_EXECUTE ) ; try { // Sets a file's POSIX permissions. // The path parameter is associated with a FileSystem that supports the PosixFileAttributeView. This attribute view provides access to file // attributes commonly associated with files on file systems used by operating systems that implement the Portable Operating System Interface (POSIX) family of standards. Files . setPosixFilePermissions ( Paths . get ( "/Users/app/Download/crunchify.sh" ) , crunchifyPermissions ) ; // Paths: This class consists exclusively of static methods that return a Path by converting a path string or URI. System . out . println ( "File permission set successfully..." ) ; } catch ( IOException e ) { // Signals that an I/O exception of some sort has occurred. This class is the general class of exceptions produced by failed or interrupted I/O operations. e . printStackTrace ( ) ; } } } |
Sadece Java Programının üzerinde çalıştırın ve aşağıdaki gibi Crunchify.sh dosyasının iznini görmelisiniz.
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- rwxrwxrwx 1 crunchify crunchify 65 Jun 23 14 : 42 crunchify . sh |
3 dosyanın altından kaldırırsanız veya yorum yaparsanız, izin aşağıdaki gibi değişecektir:
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// crunchifyPermissions.add(PosixFilePermission.OTHERS_READ); // crunchifyPermissions.add(PosixFilePermission.OTHERS_WRITE); // crunchifyPermissions.add(PosixFilePermission.OTHERS_EXECUTE); |
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- rwxrwx --- 1 crunchify crunchify 65 Jun 23 14 : 42 crunchify . sh |
Linux Dosya İzinlerini anlayalım:
İşte tüm izinlerin bir listesi:
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Yukarıdaki programı çalıştırırken herhangi bir sorunla karşılaşırsanız bize bildirin.
