<%
  String s="select * from cnnewstype";
  ResultSet rs1=conn.executeQuery(s);
%> <select name="types" size="1" class="input">
          <option value="1" >--请选择文章类型--</option>
          <%    
 while (rs1.next()) 
 {
       if(request.getParameter("newstype")!=null){
        newstype=request.getParameter("newstype");
if(rs1.getString("id").equals(newstype)){//多做几个判断就好了
%>
                     <option value="<%=rs1.getInt("id")%>" selected><%=rs1.getString("newstype")%></option>
   <%
        }else{%>
         <option value="<%=rs1.getInt("id")%>" ><%=rs1.getString("newstype")%></option>
<%}
   }else{
  %>
                <option value="<%=rs1.getInt("id")%>"><%=rs1.getString("newstype")%></option>
                <%
      }   
  rs1.close();  
  %>
        </select>