Java IO & NIO - Files.readAttributes() Examples

package com.logicbig.example.files;

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.DosFileAttributes;
import java.nio.file.attribute.PosixFileAttributes;

public class ReadAttributesExample {

    public static void main(String... args) throws Exception {
        Path path = Files.createTempFile("test-file", ".txt");
        try {
            BasicFileAttributes attributes = Files.readAttributes(path, BasicFileAttributes.class);
            printBasicAttributes(attributes);
        } catch (Exception e) {
        }
        try {
            //it will throw not supported exception on windows
            PosixFileAttributes attributes = Files.readAttributes(path, PosixFileAttributes.class);
            //printPosixFileAttributes(attributes)

        } catch (Exception e) {
        }
        try {
            DosFileAttributes attributes = Files.readAttributes(path, DosFileAttributes.class);
            printDosAttributes(attributes);
        } catch (Exception e) {
        }
    }

    private static void printBasicAttributes(BasicFileAttributes attributes) throws Exception {
        System.out.println("-- Some BasicFileAttributes --");
        System.out.printf("creationTime     = %s%n", attributes.creationTime());
        System.out.printf("lastAccessTime   = %s%n", attributes.lastAccessTime());
        System.out.printf("lastModifiedTime = %s%n", attributes.lastModifiedTime());
        System.out.printf("size             = %s%n", attributes.size());
        System.out.printf("directory        = %s%n", attributes.isDirectory());

    }

    private static void printDosAttributes(DosFileAttributes attributes) {
        System.out.println("-- Some DosFileAttributes --");
        System.out.printf("archive  = %s%n", attributes.isArchive());
        System.out.printf("readOnly = %s%n", attributes.isReadOnly());
        System.out.printf("hidden   = %s%n", attributes.isHidden());
    }
}

package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Map;

public class ReadAttributesExample2 {

    public static void main(String... args) throws IOException {
        Path path = Files.createTempFile("test-file", ".txt");

        System.out.println("-- Some Basic Attributes --");
        //same as "basic:lastModifiedTime....", default attribute type is basic
        Map<String, Object> attributes =
                Files.readAttributes(path, "lastModifiedTime,lastAccessTime");
        attributes.entrySet().forEach(entry ->
                System.out.printf("%18s = %s%n", entry.getKey(), entry.getValue()));

        System.out.println("-- all Basic Attributes --");
        attributes =
                Files.readAttributes(path, "*");
        attributes.entrySet().forEach(entry ->
                System.out.printf("%18s = %s%n", entry.getKey(), entry.getValue()));

        System.out.println("-- All Dos Attributes --");
        attributes = Files.readAttributes(path, "dos:*");
        attributes.entrySet().forEach(entry ->
                System.out.printf("%15s = %s%n", entry.getKey(), entry.getValue()));
    }
}

package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.util.Map;

public class ReadAttributesExample3 {

    public static void main(String... args) throws IOException {
        Path dirPath = Files.createTempDirectory("test-dir");
        Path filePath = Files.createTempFile(dirPath, "test-file", ".txt");
        System.out.println("-- src attributes --");
        printAllDosAttribute(filePath);
        //must run as admin
        Path symPath = Files.createSymbolicLink(dirPath.resolve("sym-tst-file.txt"), filePath);
        System.out.println("-- sym attributes --");
        printAllDosAttribute(symPath);

        System.out.println("-- sym attributes with NOFOLLOW_LINKS --");
        printAllDosAttribute(symPath, LinkOption.NOFOLLOW_LINKS);

    }

    private static void printAllDosAttribute(Path filePath, LinkOption... options) throws IOException {
        Files.readAttributes(filePath, "dos:*", options)
             .entrySet()
             .forEach(ReadAttributesExample3::printAttributes);
    }

    private static void printAttributes(Map.Entry<String, Object> entry) {
        System.out.printf("%18s = %s%n", entry.getKey(), entry.getValue());
    }
}