代码好多太乱:
<%
            
 st2=str.switchChinese(request.getParameter("st2"));
 %>
表单
<select name="st2" style="width:100">
<% String sql="select name from z_value where type_code ='sex'";
String sel="";
ResultSet rs;
rs=db.executeQuery(sql);
while(rs.next()){
sel="";
if (st2.equals(rs.getString(1))){sel="selected";}%>
 <option value=<%=rs.getString(1)%> <%=sel%>><font size="-1" face="&Euml;&Icirc;&Igrave;&aring;"><%=rs.getString(1)%> </font></option>
  <%}%>
</select>