Java ZipFileSystem 属性

Question

所以我使用的代码非常类似于以下内容（来自 http://fahdshariff.blogspot.com/2011/08/java-7-working-with-zip-files.html）：

/**
 * Creates/updates a zip file.
 * @param zipFilename the name of the zip to create
 * @param filenames list of filename to add to the zip
 * @throws IOException
 */
public static void create(String zipFilename, String... filenames)
    throws IOException {

  try (FileSystem zipFileSystem = createZipFileSystem(zipFilename, true)) {
    final Path root = zipFileSystem.getPath("/");

    //iterate over the files we need to add
    for (String filename : filenames) {
      final Path src = Paths.get(filename);

      //add a file to the zip file system
      if(!Files.isDirectory(src)){
        final Path dest = zipFileSystem.getPath(root.toString(),
                                                src.toString());
        final Path parent = dest.getParent();
        if(Files.notExists(parent)){
          System.out.printf("Creating directory %s\n", parent);
          Files.createDirectories(parent);
        }
        Files.copy(src, dest, StandardCopyOption.REPLACE_EXISTING);
      }
      else{
        //for directories, walk the file tree
        Files.walkFileTree(src, new SimpleFileVisitor<Path>(){
          @Override
          public FileVisitResult visitFile(Path file,
              BasicFileAttributes attrs) throws IOException {
            final Path dest = zipFileSystem.getPath(root.toString(),
                                                    file.toString());
            Files.copy(file, dest, StandardCopyOption.REPLACE_EXISTING);
            return FileVisitResult.CONTINUE;
          }

          @Override
          public FileVisitResult preVisitDirectory(Path dir,
              BasicFileAttributes attrs) throws IOException {
            final Path dirToCreate = zipFileSystem.getPath(root.toString(),
                                                           dir.toString());
            if(Files.notExists(dirToCreate)){
              System.out.printf("Creating directory %s\n", dirToCreate);
              Files.createDirectories(dirToCreate);
            }
            return FileVisitResult.CONTINUE;
          }
        });
      }
    }
  }
}

当我在visitFile()方法中调用Files.copy()时，src有'rwxr-xr-x'文件权限，dest创建成功。当我解压缩结果时，对应的文件只有 'rw-r--r--' 权限。我尝试使用

Files.copy(src, dest, StandardCopyOption.COPY_ATTRIBUTES, StandardCopyOption.REPLACE_EXISTING)

但文件仍然具有 'rw-r--r--' 权限...使用 'rwxr-xr-x' 权限集执行 Files.create() 具有相同的结果...有什么想法吗？

编辑：我尝试了以下方法，但我只得到一个 UnsupportedOperationException：

Set<PosixFilePermission> permissions = PosixFilePermissions.fromString("rwxr-xr-x");
Files.setPosixFilePermissions(dest, permissions);

Answer 1

ZIP file format by default does not support Unix filesystem features. And the ZIP filesystem provider至少不支持存储Unix文件权限。

// ZIP created with teh Java zipfs
zipinfo foobar.zip

file system or operating system of origin:      MS-DOS, OS/2 or NT FAT
version of encoding software:                   2.0
...
non-MSDOS external file attributes:             000000 hex
MS-DOS file attributes (00 hex):                none

如果您使用 Linux 版本的 Info-ZIP 实现创建 ZIP 文件。

file system or operating system of origin:      Unix
version of encoding software:                   3.0
...
apparent file type:                             text
Unix file attributes (100755 octal):            -rwxr-xr-x
MS-DOS file attributes (00 hex):                none

有关更多信息，您可以查看 ZipFileSystem.java original source or from the current included in JDK 8 Demos and Samples

的来源

编辑 ~~您可以尝试 TrueVFS 而不是 zipfs。快速检查后，它似乎也不支持 Unix 文件权限。~~

您可以使用 Apache commons compress。按照 javadoc 它支持 Unix 权限。

来自 ZipArchiveEntry.setUnixMode

Sets Unix permissions in a way that is understood by Info-Zip's unzip command.

Java ZipFileSystem 属性

Java ZipFileSystem attributes

java

filesystems

zip

file-permissions

copy