In Java, file permissions are very OS specific: NTFS (windows) and FAT/FAT32, all have different kind of file permissions. Java comes with some generic file permission to deal with it.
Check if the file permission allow :
file.canExecute(); – return true, file is executable; false is not.
file.canWrite(); – return true, file is writable; false is not.
file.canRead(); – return true, file is readable; false is not.
Set the file permission :
file.setExecutable(boolean); – true, allow execute operations; false to
disallow it.
file.setReadable(boolean); – true, allow read operations; false to
disallow it.
file.setWritable(boolean); – true, allow write operations; false to
disallow it.
Java IO classes do not have ready method for it, but you can use the following :
File permission example:
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package javatest.file; import java.io.File; import java.io.IOException; public class FilePermissionExample { public static void main( String[] args ) { try { File file = new File("/javatest/myjava.td"); if(file.exists()){ System.out.println("Is Execute allow : " + file.canExecute()); System.out.println("Is Write allow : " + file.canWrite()); System.out.println("Is Read allow : " + file.canRead()); } file.setExecutable(false); file.setReadable(false); file.setWritable(false); System.out.println("Is Execute allow : " + file.canExecute()); System.out.println("Is Write allow : " + file.canWrite()); System.out.println("Is Read allow : " + file.canRead()); if (file.createNewFile()){ System.out.println("new File is created!"); }else{ System.out.println("this File already exists."); } } catch (IOException e) { e.printStackTrace();}}} |