/**
 * Returns the the UTF-8 encoded entry name from the UPath extra data record or
 * if that was not found the file name directly from the given FileHeader.
 * 
 * @param fileHeader
 * @return
 */
public static String getFileNameFromExtraData(FileHeader fileHeader) {
	for (ExtraDataRecord extraDataRecord : fileHeader.getExtraDataRecords()) {
		long identifier = extraDataRecord.getHeader();
		if (identifier == 0x7075) {
			byte[] bytes = extraDataRecord.getData();
			ByteBuffer buffer = ByteBuffer.wrap(bytes);
			byte version = buffer.get();
			assert (version == 1);
			int crc32 = buffer.getInt();
			return new String(bytes, 5, buffer.remaining(), StandardCharsets.UTF_8);
		}
	}
	return fileHeader.getFileName();
}

public void test() throws ZipException, UnsupportedEncodingException {
  ZipFile zipFile = new ZipFile("/Users/someuser/Downloads/a.zip");
  for (FileHeader fileHeader : zipFile.getFileHeaders()) {
    zipFile.extractFile(fileHeader, "/Users/someuser/Downloads/extract", getGbkEncodedFileName(fileHeader.getFileName()));
  }
}

private String getGbkEncodedFileName(String fileName) throws UnsupportedEncodingException {
  return new String(fileName.getBytes("Cp437"), "GBK");
}