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在LoginServlet中这样写：
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws
ServletException, IOException {
String uName =
request.getParameter("uName");
String uPassword =
request.getParameter("uPassword");
boolean flag = new
com.lhgg.member.dao.MembersDao().login(uName,
uPassword);
if (flag) {
//验证成功，转向登录成功后的界面
request.getRequestDispatcher("welcome.jsp").forward(request,
response);
} else {
//验证失败，转向登录界面，并传递一个参数error，其值为yes
response.sendRedirect("login.jsp?error=yes");
}
}
然后在loging.jsp的最后一个</html>的后面加如下代码：
<script>
//取出传回来的参数error并与yes比较
var errori
='<%=request.getParameter("error")%>';
if(errori=='yes'){
alert("登录失败!");
}
</script>
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