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Files.newDirectoryStream: Get Files From Folder
This page was last reviewed on Jan 26, 2024.
Dot Net Perls
NewDirectoryStream. How can we loop over all the files from a folder? In Java, we can use the Files class and call Files.newDirectoryStream, and then use a for-loop.
With this method, we need to get a Path representing the target directory. Then, we need to wrap the method call in an exception-handling block, as it might cause an error.
Directory Size
Example. This program imports the required Java IO classes with 2 import statements at the top. This is necessary to more easily access the types.
Step 1 We call getPath with a folder name on the default file system. This accesses a "programs" folder in the working directory.
Step 2 We call Files.newDirectoryStream, and pass the Path object we created. This returns a DirectoryStream.
Step 3 We use a for-loop over the Path instances in the DirectoryStream, and print each one to System.out.
Console
Step 4 It is possible for Files.newDirectoryStream to throw an exception, so we may want to handle that here.
try
import java.io.*; import java.nio.file.*; public class Program { public static void main(String[] args) { // Step 1: get path to a folder. var path = FileSystems.getDefault().getPath("programs"); // Step 2: call Files.newDirectoryStream to get paths from a folder. try (var stream = Files.newDirectoryStream(path)) { // Step 3: enumerate the paths in a for-loop and print them out. for (Path entry : stream) { System.out.println("Path: " + entry); } } catch (IOException exception) { // Step 4: if an error occurred, handle it. System.err.println("Error"); } } }
Path: programs/program.go Path: programs/example.txt Path: programs/Program.java Path: programs/program.py Path: programs/program.scala Path: programs/program.swift Path: programs/program.php Path: programs/program.js
Summary. With the Path and DirectoryStream types, we can access all the paths in a folder in an elegant way. Occasionally an exception may occur if the directory is missing.
Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.
Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
This page was last updated on Jan 26, 2024 (edit link).
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