Java: Find all files and directories by mask [duplicate]

Question

How to iterate through all files by mask in Java? For example, there's a mask with wild cards like

D:\work\mytestfolder\temp\*.txt

Need to get a collection (or iterator or whatever else) of all *.txt files in the directory above.

Some more details. Want to process a number of files and it's convenient here to define a set of masks like those shown above. The GLOBE syntax (https://docs.oracle.com/javase/7/docs/api/java/nio/file/FileSystem.html#getPathMatcher(java.lang.String)) looks very helpful and would desirably be supported.

Now struggling with this docs.oracle.com/javase/tutorial/essential/io/find.html. Seems too much complicated for so simple task. — Nick Legend
– Nick Legend, Commented Oct 26, 2017 at 12:45
@Alex, it's not actually that bad. In Java8 you have Files::walk which streams entities to you. So you split your mask on first wildcard, build a path from first part and a PathMatcher from second part, then start walking from the Path and filter the stream using PathMatcher. — M. Prokhorov
– M. Prokhorov, Commented Oct 26, 2017 at 12:56
have had a look at stackoverflow.com/questions/3057621/…. Not exactly what I need. Of cause we can implement our own solutions but I'd like to find something standard first. Also our hand-made solutions would desirably handle platform specifics, doesn't look like a simple task :( — Nick Legend
– Nick Legend, Commented Oct 26, 2017 at 13:13

VGR · Accepted Answer · 2017-10-26 14:00:56Z

2

No need to create an explicit PathMatcher. Just use Files.newDirectoryStream:

try (DirectoryStream<Path> dir = Files.newDirectoryStream( Paths.get("D:\\work\\mytestfolder\\temp"), "*.txt")) { for (Path entry : dir) { // ... } }

answered Oct 26, 2017 at 14:00

VGR

44.9k4 gold badges52 silver badges71 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Nick Legend Over a year ago

It works and is convenient enough, thanks! Just need to get it to iterate also through the subdirectories of the starting directory (recursively).

VGR Over a year ago

For recursive traversal, you’ll want Files.walk or Files.walkFileTree. Neither has a file mask option, but obviously it’s easy enough to check each file yourself. The former method returns a Stream, so you can do Files.walk(dir).filter(p -> !Files.isDirectory(p) && p.toString().endsWith(".txt")).

Nick Legend Over a year ago

Cannot use Java 8, at least for now. So Files.walkFileTree with explicit PathMatcher seems to be the best choice... though really too verbose :(

jai · Accepted Answer · 2017-10-26 12:49:32Z

File dir = new File("E:/Test"); File [] files = dir.listFiles(new FilenameFilter() { @Override public boolean accept(File dir, String name) { return name.endsWith(".chm"); } }); for (File xmlfile : files) { System.out.println(xmlfile); }

Collectives™ on Stack Overflow

Java: Find all files and directories by mask [duplicate]

2 Answers 2

3 Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Linked

Related