275. Implementing SWS for a zip file system

Using a ZIP file system can also be a common use case for SWS. The following snippet of code creates a ZIP file system via the java.nio.file API and returns the corresponding path:

private static Path zipFileSystem() throws IOException {
  Map<String, String> env = new HashMap<>();
  env.put("create", "true");
  Path root = Path.of("./zips").toAbsolutePath();
  Path zipPath = root.resolve("docs.zip")
    .toAbsolutePath().normalize();
  FileSystem zipfs = FileSystems.newFileSystem(zipPath, env);
  Path externalTxtFile = Paths.get("./docs/books.txt");
  Path pathInZipfile = zipfs.getPath("/bookszipped.txt");
  // copy a file into the zip file
  Files.copy(externalTxtFile, pathInZipfile,
             StandardCopyOption.REPLACE_EXISTING);
  return zipfs.getPath("/");
}

The result is an archive named docs.zip with a single file named bookszipped.txt—...