public String postFile(URLFetchService us, List<PostObj> postobjlist) throws Exception {
    int index;

    Gson gson;
    String linkID;
    List<String> linkList;
    HTTPRequest req;
    String param;

    gson = new Gson();

    linkID = createUID();
    linkList = new ArrayList<String>();
    for (index = 0; index < postobjlist.size(); index++) {
      linkList.add(postobjlist.get(index).filelink);
    }

    param =
        URLEncoder.encode("postlist", "UTF-8")
            + "="
            + URLEncoder.encode(gson.toJson(postobjlist), "UTF-8")
            + '&'
            + URLEncoder.encode("linkid", "UTF-8")
            + "="
            + URLEncoder.encode(linkID, "UTF-8")
            + '&'
            + URLEncoder.encode("linklist", "UTF-8")
            + "="
            + URLEncoder.encode(gson.toJson(linkList), "UTF-8");
    req =
        new HTTPRequest(
            new URL("http://tnfshmoe.appspot.com/postdf89ksfxsyx9sfdex09usdjksd"), HTTPMethod.POST);
    req.setPayload(param.getBytes());
    us.fetch(req);

    return linkID;
  }
  public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
    int index;

    DatastoreService ds;
    MemcacheService ms;

    Cookie[] cookies;
    boolean insideFlag;

    String delpw;
    String paramOffset;
    String paramSize;
    int offset;
    int size;

    Key postObjGroupKey;
    Query q;
    List<Entity> postObjList;
    PostObj postObj;

    Gson gson;
    List<String> filelinkList;

    resp.setCharacterEncoding("UTF-8");
    resp.setContentType("text/plain");

    ds = DatastoreServiceFactory.getDatastoreService();
    ms = MemcacheServiceFactory.getMemcacheService();

    insideFlag = false;
    try {
      cookies = req.getCookies();
      if (cookies.length > 0) {
        if (ms.contains(cookies[0].getValue()) == true) {
          insideFlag = true;
        }
      }
    } catch (Exception e) {
      insideFlag = false;
    }

    delpw = req.getParameter("delpw");
    if (delpw != null) {
      if (delpw.equals("") == true) {
        delpw = null;
      }
    }

    paramOffset = req.getParameter("offset");
    if (paramOffset != null) {
      offset = Integer.valueOf(paramOffset);
    } else {
      offset = 0;
    }

    paramSize = req.getParameter("size");
    if (paramSize != null) {
      size = Integer.valueOf(paramSize);
    } else {
      size = 4096;
    }

    postObjGroupKey = KeyFactory.createKey("PostObjGroup", 1L);
    q = new Query("PostObj", postObjGroupKey);
    if (delpw != null) {
      q.addFilter("delpw", FilterOperator.EQUAL, delpw);
      q.addSort("delpw");
    }
    q.addSort("posttime", SortDirection.DESCENDING);
    postObjList = ds.prepare(q).asList(FetchOptions.Builder.withOffset(offset).limit(size));

    postObj = new PostObj();
    filelinkList = new ArrayList<String>();
    for (index = 0; index < postObjList.size(); index++) {
      postObj.getDB(postObjList.get(index));
      if ((postObj.flag.equals("showgallery") == false && insideFlag == true)
          || (postObj.flag.equals("showgallery") == true && insideFlag == false)
          || delpw != null) {
        filelinkList.add(postObj.filelink);
      }
    }

    gson = new Gson();
    resp.getWriter().print(gson.toJson(filelinkList));
  }