jsp servlet select 传值

//jsp

<script language="javascript">
function loginIn(){
var selectOb= document.getElementById("select");//select对象
var selectText= selectOb.options[selectOb.selectedIndex].text//得到文本
//1.var selectOb= document.getElementById("selectObId");//select对象
//2.var selectId = selectOb.selectedIndex;//当前选择的索引
//3.var selectValue= selectOb.options[selectOb.selectedIndex].value//得到值
//4.var selectText= selectOb.options[selectOb.selectedIndex].text//得到文本
//5.selectOb.options.length = 0//清空
//6.selectOb.options[0] = new Option("text",'value');//添加数据
form9.action="servlet/loginServlet?selectt="+selectText;
form9.submit();
}
</script>

<form name="form9" method="post">

<select name="select" size="1" id="select" onchange="loginIn();">
<%
String sql = "select username from user where adminname='"+ session.getAttribute("adminname") + "'";
ResultSet rs = db.query(sql);
while (rs.next()) {
%>
<option value=><%=rs.getString("username")%></option>
<%
}
%>
</select>

</form>

//servlet

String selectname=request.getParameter("selectt");