I have files that need an extra attribute called "encryption used". But this gives "IllegalArgumentExeption". I know why it gives that error, "encryption used" isn't known as an attribute, but is there a way I can force it to be? Or add custom metadata to the file?
Path path = new File("/propertyfiles/encdec.properties").toPath();
try{
Files.setAttribute(path, "encryption used", "testtesttest");
}catch(IOException e){
System.out.println(e.getMessage());
}
try{
System.out.println(Files.getAttribute(path, "encryption used"));
}catch(IOException e){
System.out.println(e.getMessage());
}
Steps for adding Metadata to ZIP in JavaLoad the ZIP file to be updated. Specify a predicate that will be used to add metadata properties. Specify a value which you want to be assigned to the selected properties. Pass the predicate to the AddProperties method.
A file system's metadata is typically referred to as its file attributes. The Files class includes methods that can be used to obtain a single attribute of a file, or to set an attribute. Methods. Comment. size(Path)
A file attribute view that supports reading or updating a file's Access Control Lists (ACL) or file owner attributes. AttributeView. An object that provides a read-only or updatable view of non-opaque values associated with an object in a filesystem. BasicFileAttributes.
If your file system supports user-defined (aka extended) attributes, then the way to set one would be like this:
Files.setAttribute(path, "user:encryption used", "testtesttest");
As the javadoc for setAttribute
explains, the 2nd argument takes the form of an optional view-name and an attribute name. In this case, you need to use the UserDefinedFileAttributeView
whose view-name is "user".
Note that different file system types support different attribute views, and your file system may not support this one.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With