Featuring JDK 7 Nio 2

Featuring JDK 7 NIO 2
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java.io.File
Many methods didn't throw exceptions when they failed.
Rename method didn't work consistently across platforms.
There was no real support for symbolic links.
Limited support for metadata, such as file permissions, file owner, and other security attributes.
Accessing file metadata was inefficient.
Many of the File methods didn't scale.
It was not possible to write reliable code that could recursively walk a file tree and respond appropriately if there were circular symbolic links.

java.nio.file.Path

Creating a Path
import java.nio.file.Paths;
Path p1 = Paths.get("/tmp/foo");
Path p2 = Paths.get(args[0]);
Path p3 = Paths.get(
URI.create("file:///Users/joe/FileTest.java"));

Checking File Accessibility
import java.nio.file.Files;
Path file = ...;
booleanisRegularExecutableFile
= Files.isRegularFile(file)
& Files.isReadable(file)
& Files.isExecutable(file);

Checking Whether Two Paths Locate the Same File
Path p1 = ...;
Path p2 = ...;
if (Files.isSameFile(p1, p2)) {
//Logic when the paths locate the same file
}

Deleting a File or Directory
try { Files.delete(path); }
catch
(NoSuchFileException) …
catch
(DirectoryNotEmptyException) …
catch
(IOException) …

Copying a File or Directory
import static java.nio.file.StandardCopyOption.*;
…
Files.copy(source, target, REPLACE_EXISTING,
COPY_ATTRIBUTES,
NOFOLLOW_LINKS);

Managing Metadata
java.nio.file.Files
size
isDirectory
isRegularFile
isSymbolicLink
isHidden
get/setLastModifiedTime
get/setOwner
get/setPosixFilePermissions
get/setAttribute

Reading, Writing and Creating Files

Reading a File by Using Buffered Stream I/O
BufferedReaderreader = Files.newBufferedReader
(file, charset)
reader.readLine();

Methods for Unbuffered Streams and Interoperable with java.io APIs
InputStreamin = Files.newInputStream(file);
BufferedReaderreader =
new BufferedReader(
new InputStreamReader(in));
reader.readLine();

Interoperability With Legacy Code
java.io.Filefile =
new File(pathname);
java.nio.file.Path path =
file.toPath();

java.nio.file
Path
methods for manipulating a path.
Files
methods for file operations, such as moving, copy, deleting, and also methods for retrieving and setting file attributes.
FileSystem
methods for obtaining information about the file system.

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Filipino software development company specializing in Java technology
Consulting, outsourcing, and offshore product development services using Open Source technologies, with a specialization in the Spring and Grails frameworks
Enterprise solutions with Google enterprise products and business intelligence solutions with the Pentaho BI Suite
Offers Java, Agile and Android training courses
www.orangeandbronze.com

THANK YOU

References
File I/O (Featuring NIO.2)
http://download.oracle.com/javase/tutorial/essential/io/fileio.html
More New I/O APIs for the Java Platform
http://openjdk.java.net/projects/nio/

Featuring JDK 7 Nio 2

by Orange and Bronze Software Labs

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