/** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */
  protected void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    String result = HttpUtil.handleRequest(request);
    System.out.println("GetFriendsServlet:" + result);

    try {
      JSONObject jsonObject = new JSONObject(result);
      String phone = jsonObject.getString("phone");

      List<User> friends = new Database().getFriends(phone);
      JSONArray jsonArray = new JSONArray();

      for (User friend : friends) {
        String friendName = friend.getName();
        String friendPhone = friend.getPhone();

        JSONObject friendObj = new JSONObject();
        friendObj.put("phone", friendPhone);
        friendObj.put("name", friendName);

        jsonArray.put(friendObj);
      }

      System.out.println("GetFriendsServlet:" + jsonArray.toString());
      HttpUtil.handleResponse(response, jsonArray.toString());
    } catch (JSONException e) {
      e.printStackTrace();
    }
  }