主要是loginReceive.jsp有问题，修改如下：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
<%
String userName = request.getParameter("userName");
String userPwd = request.getParameter("userPwd");
if (userName.equals("sa") && userPwd.equals("sa")) {
%>
<%
} else {
%>
<%
}
%>
