metadata - this is a data of a data. If your files contains a data, then metadata is its file attributes.
File Attributes are the following: size, directory, regular file, symbolic link, hidden, modified time, owner of the file, file permission, and file attribute.
Files read attributes to get all the file attributes.
1. readAttributes(Path, String, LinkOption...) - The String here is the attributes to read.
2. readAttributes(Path, Class<A>, LinkOption...) - Class<A> is the type of the attributes.
Interface for different Attributes View
1. BasicFileAttributeView - for basic attributes
2. DosFileAttributeView - extended basic attributes that supports DOS attributes
3. PosixFileAttributeView - extended basic attributes that supports POSIX or Portable operating system for UNIX. It includes file owner, group owner and nine related access permissions.
4. FileOwnerAttributeView - for file owner
5. AclFileAttributeView - for File Access Control list
6. UserDefinedFileAttributeView - for user defined like storing MIME type in solaris.
Just add this on the previous program
=====================
public static void main(String[] args) throws IOException{
....
System.out.println("""
|.....
|5. Show Basic Attributes
|6. Show Dos Attributes
|7. Show Disc Usage in File Store
""");
.....
switch(funcNumber){
......
case 5 -> showBasicAttributes(path2);
case 6 - > showDosAttributes(path2);
case 7 -> showFileStoreAttributes(path2);
.........
}
..........
}
private static void showBasicAttributes(Path thePath) throws IOException{
BasicFileAttributes attr = Files.readAttributes(thePath, BasicFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
System.out.println("file size: " + attr.size());
System.out.println("Is Directory: " + attr.isDirectory());
System.out.println("Is Regular File: " + attr.isRegularFile());
System.out.println("Is Symbolic Link: " + attr.isSymbolicLink());
System.out.println("Is other (not regular or etc..): " + attr.isOther());
System.out.println("Creation time: " + attr.creationTime());
System.out.println("Last modified time: " + attr.lastModifiedTime());
System.out.println("last access: " + attr.lastAccessTime());
}
private static void showDosAttributes(Path thePath) throws IOException, UnsupportedOperationException {
DosFileAttributes attr = Files.readAttributes(thePath, DosFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
System.out.println("Read only: " + attr.readOnly());
System.out.println("System: " + attr.isSystem());
System.out.println("Hidden: " + attr.isHidden());
System.out.println("Archive: " + attr.isArchive());
}
private static void showFileStoreAttributes(Path thePath) throws IOException{
FileStore fileStore = Files.getFileStore(thePath);
System.out.println("Total space: " + fileStore.getTotalSpace()/1024);
System.out.println("Used space: " + (fileStore.getTotalSpace() - fileStore.getUnallocatedSpace())/1024);
System.out.println("Available space: " + fileStore.getUsableSpace()/1024);
}
=====================
Note: Other things you can do with the files metadata
1. Setting a File or group owner - you can translate a name into an object so you can store as a file owner or a group owner using UserPrincipalLookUpService.
UserPrincipal owner = path.getFileSystem().getUserPrincipalLookupService().lookupPrincipalByName("Name");
Files.setOwner(path, owner);
2. User defined filed attributes - to create and track your own attributes. You used UserDefinedFileAttributeView.class
3. PosixFileAttributes - i did not add this since it throws UnsupportedOperationException. You used PosixFileAttributes.class and PosixFilePermissions.
YOU ARE READING
Java Programming
Randomhttps://docs.oracle.com/javase/tutorial/ This is the link where I learned my java lessons online. I choose java as first programming language. I am a career shifter. I just want to start something new. I choose to write it here in Wattpad so that I...
