使用apache sanselan不会为jpg文件更新Title属性的值？

Question

我想更新.jpg＆amp;的元数据（如标签，评论等......） .tif文件使用JAVA 任何人都可以帮助我......

注意：我尝试使用以下代码，但是当我使用Windows资源管理器查找文件的属性时，标题的值不会更新

 public static void changeExifMetadata(File jpegImageFile, File dst)
                   throws IOException, ImageReadException, ImageWriteException {

   OutputStream os = null;
    try
     {   
TiffOutputSet outputSet = null;
IImageMetadata metadata = Sanselan.getMetadata(jpegImageFile);
JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;
if (null != jpegMetadata)
{
    TiffImageMetadata exif = jpegMetadata.getExif();

    if (null != exif)
    {
        outputSet = exif.getOutputSet();

    }else  {}
}
     if (null == outputSet)
    outputSet = new TiffOutputSet();
         {

    final TiffOutputDirectory exifDir = outputSet .getOrCreateExifDirectory();
    byte[] rawBytes = "KasperAuthor".getBytes("UTF-16LE"); 
    byte[] nullTerminatedBytes = new byte[rawBytes.length + 2]; 
    exifDir.removeField(ExifTagConstants.EXIF_TAG_XPTITLE);
TiffOutputField authorField = new TiffOutputField(ExifTagConstants.EXIF_TAG_XPTITLE, ExifTagConstants.EXIF_TAG_XPTITLE.dataTypes[0], nullTerminatedBytes.length,  nullTerminatedBytes);                                                            
    exifDir.add(authorField);
}

 } finally
   {
if (os != null)
    try
    {
        os.close();
    } catch (IOException e)
    {

    }
}
}

提前感谢....