How to read all files in a folder from Java?

Answer 1

One remark according to get all files in the directory.
The method Files.walk(path) will return all files by walking the file tree rooted at the given started file.

For instance, there is the next file tree:

\---folder
    |   file1.txt
    |   file2.txt
    |
    \---subfolder
            file3.txt
            file4.txt

Using the java.nio.file.Files.walk(Path):

Files.walk(Paths.get("folder"))
        .filter(Files::isRegularFile)
        .forEach(System.out::println);

Gives the following result:

folder\file1.txt
folder\file2.txt
folder\subfolder\file3.txt
folder\subfolder\file4.txt

To get all files only in the current directory use the java.nio.file.Files.list(Path):

Files.list(Paths.get("folder"))
        .filter(Files::isRegularFile)
        .forEach(System.out::println);

Result:

folder\file1.txt
folder\file2.txt