다음 예제는 확장자를 기반으로 디렉토리의 파일을 인쇄합니다 -
예
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); } }
출력
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
다음 예제는 확장자를 기반으로 디렉토리에 있는 PDF 파일의 이름을 인쇄합니다 -
예
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); } } }
출력
List of the jpeg files in the specified directory: demo1.pdf demo2.pdf