Java中删除文件或文件夹的几种方法总结

Files.deleteIfExists(Path path)

//删除暂存的pdf
File file =new File(pdfFilename);
file.delete();

Path path2 = Paths.get(pdfFilename);
Files.delete(path2);

private  void createMoreFiles() throws IOException {
   Files.createDirectories(Paths.get("D:\data\test1\test2\test3\test4\test5\"));
   Files.write(Paths.get("D:\data\test1\test2\test2.log"), "hello".getBytes());
   Files.write(Paths.get("D:\data\test1\test2\test3\test3.log"), "hello".getBytes());
}

@Test
void testDeleteFileDir5() throws IOException {
   createMoreFiles();
   Path path = Paths.get("D:\data\test1\test2");

   Files.walkFileTree(path,
      new SimpleFileVisitor<Path>() {
         // 先去遍历删除文件
         @Override
         public FileVisitResult visitFile(Path file,
                                  BasicFileAttributes attrs) throws IOException {
            Files.delete(file);
            System.out.printf("文件被删除 : %s%n", file);
            return FileVisitResult.CONTINUE;
         }
         // 再去遍历删除目录
         @Override
         public FileVisitResult postVisitDirectory(Path dir,
                                         IOException exc) throws IOException {
            Files.delete(dir);
            System.out.printf("文件夹被删除: %s%n", dir);
            return FileVisitResult.CONTINUE;
         }

      }
   );

}

@Test
void testDeleteFileDir6() throws IOException {
   createMoreFiles();
   Path path = Paths.get("D:\data\test1\test2");

   try (Stream<Path> walk = Files.walk(path)) {
      walk.sorted(Comparator.reverseOrder())
         .forEach(DeleteFileDir::deleteDirectoryStream);
   }

}

private static void deleteDirectoryStream(Path path) {
   try {
      Files.delete(path);
      System.out.printf("删除文件成功：%s%n",path.toString());
   } catch (IOException e) {
      System.err.printf("无法删除的路径 %s%n%s", path, e);
   }
}

//传统IO递归删除
@Test
void testDeleteFileDir7() throws IOException {
   createMoreFiles();
   File file = new File("D:\data\test1\test2");
   deleteDirectoryLegacyIO(file);

}

private void deleteDirectoryLegacyIO(File file) {

   File[] list = file.listFiles();  //无法做到list多层文件夹数据
   if (list != null) {
      for (File temp : list) {     //先去递归删除子文件夹及子文件
         deleteDirectoryLegacyIO(temp);   //注意这里是递归调用
      }
   }

   if (file.delete()) {     //再删除自己本身的文件夹
      System.out.printf("删除成功 : %s%n", file);
   } else {
      System.err.printf("删除失败 : %s%n", file);
   }
}