jsp页面中下拉框列表刷新值不变

String sele =request.getParameter("sele")==null?"":request.getParameter("sele");

session.setAttribute("option", sele);

<%

String gg=(String)session.getAttribute("option")==null?"":(String)session.getAttribute("option");

int g=0;

if(gg.equals("")){

g=0;

}else{

g=Integer.parseInt(gg);

}

%>

<select name="sele">

<option value="0" >请选择</option>

<option value="1" <%if(g==1){ %>selected="selected"<%}%>>第一行</option>

<option value="2" <%if(g==2){ %>selected="selected"<%}%>>第二行</option>

<option value="3" <%if(g==3){ %>selected="selected"<%}%>>第三行</option>

<option value="4" <%if(g==4){ %>selected="selected"<%}%>>第四行</option>

<option value="5" <%if(g==5){ %>selected="selected"<%}%>>第五行</option>

</select>