Java : How to work with file and directory

The java.nio.file package (from Java 7) has improved the way we work with the file system.

Create a directory

For creating a new directory, we get a Path object for the provided path. Then, we check if the directory exists. If not, we call the static createDirectories() method of the Files class.

	String myDirectory = "c:/remy/files";
	Path directory = Paths.get(myDirectory);
	if(Files.notExists(directory))
	Files.createDirectories(directory);

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Create a File

For creating a file, we follow basically the same process. But we get a Path object that refers to the directory and file. If the file doesn't exist, we call createFile() method of the Files class.

	String myFile = "company.json";
	Path pathToMyFile = Paths.get(myDirectory,myFile);
	if(Files.notExists(pathToMyFile))
	Files.createFile(pathToMyFile);

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Iterate through Files in a directory

By using the static newDirectoryStream() method of the Files class, you can list the files in a directory this way:

	if(Files.exists(myDirectory) && Files.isDirectory(myDirectory)){
	DirectoryStream<Path> stream = Files.newDirectoryStream(myDirectory);
	stream.forEach(path -> {
	if(Files.isRegularFile(path))
	System.out.println(path.getFileName());
	});
	}

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