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BAEL-5712: Improvement in Listing files under directory (#12643)

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Co-authored-by: Harpal Singh <harpal.singh@kaleyra.com>
This commit is contained in:
Harry9656
2022-09-08 22:48:29 +02:00
committed by GitHub
parent 575c2be85a
commit f39cb4b77a
2 changed files with 58 additions and 47 deletions
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43
core-java-modules/core-java-io-2/src/main/java/com/baeldung/listfiles/ListFiles.java
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@@ -2,12 +2,7 @@ package com.baeldung.listfiles;
import java.io.File;
import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.HashSet;
import java.util.Set;
@@ -15,32 +10,31 @@ import java.util.stream.Collectors;
import java.util.stream.Stream;
public class ListFiles {
public static final int DEPTH = 1;
public Set<String> listFilesUsingJavaIO(String dir) {
return Stream.of(new File(dir).listFiles())
.filter(file -> !file.isDirectory())
.map(File::getName)
.collect(Collectors.toSet());
.filter(file -> !file.isDirectory())
.map(File::getName)
.collect(Collectors.toSet());
}
public Set<String> listFilesUsingFilesList(String dir) throws IOException {
try (Stream<Path> stream = Files.list(Paths.get(dir))) {
return stream
.filter(file -> !Files.isDirectory(file))
.map(Path::getFileName)
.map(Path::toString)
.collect(Collectors.toSet());
.filter(file -> !Files.isDirectory(file))
.map(Path::getFileName)
.map(Path::toString)
.collect(Collectors.toSet());
}
}
public Set<String> listFilesUsingFileWalk(String dir, int depth) throws IOException {
try (Stream<Path> stream = Files.walk(Paths.get(dir), depth)) {
return stream
.filter(file -> !Files.isDirectory(file))
.map(Path::getFileName)
.map(Path::toString)
.collect(Collectors.toSet());
.filter(file -> !Files.isDirectory(file))
.map(Path::getFileName)
.map(Path::toString)
.collect(Collectors.toSet());
}
}
@@ -48,10 +42,9 @@ public class ListFiles {
Set<String> fileList = new HashSet<>();
Files.walkFileTree(Paths.get(dir), new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
if (!Files.isDirectory(file)) {
fileList.add(file.getFileName()
.toString());
fileList.add(file.getFileName().toString());
}
return FileVisitResult.CONTINUE;
}
@@ -60,16 +53,14 @@ public class ListFiles {
}
public Set<String> listFilesUsingDirectoryStream(String dir) throws IOException {
Set<String> fileList = new HashSet<>();
Set<String> fileSet = new HashSet<>();
try (DirectoryStream<Path> stream = Files.newDirectoryStream(Paths.get(dir))) {
for (Path path : stream) {
if (!Files.isDirectory(path)) {
fileList.add(path.getFileName()
.toString());
fileSet.add(path.getFileName().toString());
}
}
}
return fileList;
return fileSet;
}
}