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Files.getFileAttributeView and Files.getFileStore in Java | java.nio.file API

By Arvind Rai, November 29, 2013
Files.getFileAttributeView and Files.getFileStore has been introduced in jdk 7. Files class is related to NIO 2. Files class has many important methods. In this page I will cover Files.getFileAttributeView and Files.getFileStore.

Files.getFileAttributeView in java.nio.file

java.nio.file.Files keep the method getFileAttributeView(). The role of this method is to fetch all attributes of a file in read mode or updatable mode. Files.getFileAttributeView returns java.nio.file.attribute.AclFileAttributeView. The syntax of the method is as below.
public static <V extends FileAttributeView> V getFileAttributeView(Path p, Class<AclFileAttributeView> type,  LinkOption... opts)
 
LinkOption is optional. Path parameter needs to be passed. Find the example how to use it.

GetFileAttributeViewExample.java
package com.concretepage.io.file;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.AclEntry;
import java.nio.file.attribute.AclFileAttributeView;
import java.util.List;
public class GetFileAttributeViewExample {
	public static void main(String[] args) throws IOException {
		 Path path = Paths.get("D:/cp","file.txt");
		 AclFileAttributeView view = Files.getFileAttributeView(path, AclFileAttributeView.class);
		 if (view != null) {
			 List<AclEntry> acls = view.getAcl();
			 for(AclEntry acl: acls){
				 System.out.println(acl.principal().getName()+":"+acl.type());
			 }
		 }
	}
}
 


Output
BUILTIN\Administrators:ALLOW
NT AUTHORITY\SYSTEM:ALLOW



Files.getFileStore in java.nio.file

java.nio.file.Files has so many useful methods. Files.getFileStore is one of them. It returns the store information of a given file. Files.getFileStore returns FileStore and FileStore has methods to get the information of file location like space being used, free space etc.

FileStore in Java NIO

A java.nio.file.FileStore represents the store for a file. The store can be a device, volume, disk partition or any external storage device. To instantiate FileStore, we need to call Files.getFileStore()

Find the syntax of Files.getFileStore.
public static FileStore getFileStore(Path p)
 
It accepts Path as an argument. Find the sample example.

GetFileStoreExample.java
package com.concretepage.io.file;
import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class GetFileStoreExample {
	public static void main(String[] args) throws IOException {
		Path path = Paths.get("D:/cp","file.txt");
		FileStore fileStore = Files.getFileStore(path);
		System.out.println(fileStore.getTotalSpace());
		System.out.println(fileStore.getUnallocatedSpace());
		System.out.println(fileStore.getUsableSpace());
	}
}
 
POSTED BY
ARVIND RAI
ARVIND RAI
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