@Override
  public List<Comment> GetCommentByTaoid(int index, String tao_id) {
    List<Comment> results;
    List<Comment> records = commentDao.getCommentByTaoid(tao_id);

    PageModel<Comment> pageModel = new PageModel<Comment>(index, records, 4);
    results = pageModel.getPageList();
    isNextPageExists = pageModel.isNextPageExist();
    return results;
  }
 @Override
 public boolean CommentPublish(Map<String, Object> map) {
   String comment_id = "";
   String comment = (String) map.get("content");
   String tao_id = (String) map.get("tao_id");
   String user_id = (String) map.get("user_id");
   String face_url = new UserServiceImpl().GetUserFaceUrl(user_id);
   date = new Date();
   dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   String currentTime = dateFormat.format(date);
   time_num = date.getTime();
   comment_id = user_id + "_c_" + time_num;
   Comment com = new Comment(comment_id, comment, currentTime, user_id, tao_id);
   com.setUser_face_url(face_url);
   boolean res = commentDao.comment_insert(com);
   return res;
 }