public static DataTablesParamModel getParam(HttpServletRequest request)
{
if(request.getParameter("sEcho")!=null && request.getParameter("sEcho")!= "")
{
DataTablesParamModel param = new DataTablesParamModel();
param.sEcho = request.getParameter("sEcho");
param.sSearch = request.getParameter("sSearch");
param.sColumns = request.getParameter("sColumns");
param.iDisplayStart = Integer.parseInt( request.getParameter("iDisplayStart") );
param.iDisplayLength = Integer.parseInt( request.getParameter("iDisplayLength") );