How to Recursively List Files in Java Using Java 8's `Files.walk` and `Files.find`?

How to Recursively List Files in Java Using Java 8

Introduction

Recursive file listing is a common task that involves traversing through directories and subdirectories to retrieve a list of all files within a specified path. In Java, there are multiple approaches to achieve this using both built-in and third-party libraries.

Java 8 (Using Files.walk)

Java 8 introduced a powerful way to process files through the Files.walk method, which provides a stream of Path objects representing all the files within a directory tree. To list all regular files under a directory, you can use the following code:

try (Stream<Path> stream = Files.walk(Paths.get(path))) {
    stream.filter(Files::isRegularFile)
          .forEach(System.out::println);
}

This approach offers a convenient and straightforward way to traverse file trees and perform operations on individual files, such as printing their names or performing additional processing.

Java 8 (Using Files.find)

Java 8 also introduced the Files.find method, which allows you to search for files based on a filter predicate. For recursive file listing, you can use a filter to check for regular files:

Files.find(Paths.get(path),
           Integer.MAX_VALUE,
           (filePath, fileAttr) -> fileAttr.isRegularFile())
        .forEach(System.out::println);

While Files.find may be more efficient if you need to filter based on file attributes, there isn't a significant performance difference between Files.walk and Files.find when simply listing regular files.

Comparison with Other Approaches

Java 8's stream-based approaches offer significant advantages over traditional recursive or hacky implementations. They provide a concise and expressive way to handle recursive file listing, making it easier to read, maintain, and extend your code.

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