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法律学如何使用 Java 搜索带有文件扩展名的目录？
下面的示例按扩展名打印目录中的文件 −
示例
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);
}
}输出
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
下面的示例按扩展名打印目录中 PDF 文件的名称 −
示例
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);
}
}
}输出
List of the jpeg files in the specified directory: demo1.pdf demo2.pdf
更新于： 08-Feb-2021
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