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How to search a directory with file extensions in Java?
Following example prints the files in a directory based on the extensions −
Example
import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.stream.Stream; public class Demo { public static void main(String[] args) throws IOException { Stream<Path> path = Files.walk(Paths.get("D:\ExampleDirectory")); System.out.println("List of PDF files:"); path = path.filter(var -> var.toString().endsWith(".pdf")); path.forEach(System.out::println); path = Files.walk(Paths.get("D:\ExampleDirectory")); System.out.println("List of JPG files:"); path = path.filter(var -> var.toString().endsWith(".jpg")); path.forEach(System.out::println); path = Files.walk(Paths.get("D:\ExampleDirectory")); System.out.println("List of text files:"); path = path.filter(var -> var.toString().endsWith(".txt")); path.forEach(System.out::println); path = Files.walk(Paths.get("D:\ExampleDirectory")); System.out.println("List of word files:"); path = path.filter(var -> var.toString().endsWith(".docx")); path.forEach(System.out::println); } }
Output
List of PDF files: D:\ExampleDirectory\demo1.pdf D:\ExampleDirectory\demo2.pdf List of JPG files: D:\ExampleDirectory\sample_jpeg1.jpg D:\ExampleDirectory\sample_jpeg2.jpg List of text files: D:\ExampleDirectory\sample1.txt D:\ExampleDirectory\sample2.txt D:\ExampleDirectory\sample3.txt List of word files: D:\ExampleDirectory\test1.docx D:\ExampleDirectory\test2.docx
Following example prints the names of the PDF files in a directory based on the extensions −
Example
import java.io.File; import java.io.FilenameFilter; import java.io.IOException; public class MyExample{ public static void main(String args[]) throws IOException { //Creating a File object for directory File directoryPath = new File("D:\ExampleDirectory"); //Creating filter for jpg files FilenameFilter jpgFilefilter = new FilenameFilter(){ public boolean accept(File dir, String name) { String lowercaseName = name.toLowerCase(); if (lowercaseName.endsWith(".pdf")) { return true; } else { return false; } } }; String imageFilesList[] = directoryPath.list(jpgFilefilter); System.out.println("List of the jpeg files in the specified directory:"); for(String fileName : imageFilesList) { System.out.println(fileName); } } }
Output
List of the jpeg files in the specified directory: demo1.pdf demo2.pdf
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