في Java كيفية تعيين إذن ملف على ملف باستخدام PosixFilePermission؟ فهم أمر chmod
نشرت: 2021-06-28
كيفية تعيين إذن الملف في جافا؟ فيما يلي مثال بسيط على إعداد إذن ملف على أي ملف مقدم.
إذا كنت جزءًا من وحدة أعمال العمليات في أي شركة ، فمن المهم جدًا أتمتة سير عمل النشر وتحليل سير العمل وما إلى ذلك.
في بعض الأحيان يتم إنهاء برنامج Java الخاص بك مع استثناء إذا كنت ستحاول تنفيذ بعض الأوامر وبطريقة ما لم يكن لديك إذن لتنفيذ ملف البرنامج النصي.
في حالتنا ، إنه ملف Crunchify.sh .
فيما يلي برنامج Java بسيط يوضح كيفية إعداد إذن الملف على أي ملف معين.
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 ( ) ; } } } |
ما عليك سوى تشغيل برنامج Java وسترى إذن ملف Crunchify.sh على النحو التالي.
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- rwxrwxrwx 1 crunchify crunchify 65 Jun 23 14 : 42 crunchify . sh |
إذا قمت بإزالة أو التعليق أدناه 3 ملفات ، فسيتم تغيير الإذن على النحو التالي:
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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 |
دعنا نفهم أذونات ملفات Linux:
فيما يلي قائمة بجميع الأذونات:
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أخبرنا إذا واجهت أي مشكلة في تشغيل البرنامج أعلاه.
