jsp页面的传值问题

以下是jsp的代码，请问怎么样实现将typeId的值传入到servlet中进行处理？

<form action="Poster/list" method="post">
  <input type="hidden" name="action" >
帖子类别：
  <select name="typeId">
<option value=""></option>
<%
  ArrayList typelist=(ArrayList)new PostTypeDao().listAll();
if(typelist==null||typelist.size()==0){
  %>
  <option value="">没有类别可显示</option>
  <%
}
else{
for(int i=0;i<typelist.size();i++){
PostType type=(PostType)typelist.get(i);
%>
<option value="<%=type.getPostTypeId() %>"><%=type.getPostTypeName() %></option>
<%
}
}
  %>
</select>
<input type="submit" value="显示">
</form>

servlet代码如下：
if (servletPath.equals("/Poster/list")) {
PostDao postDao = new PostDao();
String strId=request.getParameter("typeId");
if(strId==null||strId.equals(""))
strId="-1";
int typeId=Integer.parseInt(strId);
List postList=null;
try {
postList = postDao.queryPoster(typeId,"all");
} catch (SQLException e) {
e.printStackTrace();
}
request.setAttribute("posterList",postList);
RequestDispatcher rd=request.getRequestDispatcher("admin/PostList.jsp");
rd.forward(request,response);
}

String strId=request.getParameter("typeId");
这句就可以的 啊，
<option value"你要传的值"><%
  ArrayList typelist=(ArrayList)new PostTypeDao().listAll();
if(typelist==null||typelist.size()==0){
  %>
</option>

获得select 标签的name属性就行了呀