wat.java

String periodoInicial = null;
String periodoFinal = null;
String periodoInicialAux = null;
String periodoFinalAux = null;

if(buscaPor == 1) {
   periodoInicial = request.getParameter("dataInicial");
   periodoFinal = request.getParameter("dataFinal");
   periodoInicialAux = request.getParameter("dataInicial");
   periodoFinalAux = request.getParameter("dataFinal");
} else {
   periodoInicial = request.getParameter("periodo");
   periodoFinal = periodoInicial;
   periodoInicialAux = request.getParameter("periodo");
   periodoFinalAux = periodoInicial;
}