WebRoot/qiantai/userlogin/userlogin.jsp

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ page isELIgnored="false" %> 

<%
String path = request.getContextPath();
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
	<meta http-equiv="pragma" content="no-cache"/>
	<meta http-equiv="cache-control" content="no-cache"/>
	<meta http-equiv="expires" content="0"/>    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"/>
	<meta http-equiv="description" content="This is my page"/>
	
	<script type='text/javascript' src='<%=path %>/dwr/interface/loginService.js'></script>
    <script type='text/javascript' src='<%=path %>/dwr/engine.js'></script>
    <script type='text/javascript' src='<%=path %>/dwr/util.js'></script>
	
    <style type="text/css" media="all">

	</style>
    
    
    <script language="javascript" type="text/javascript">
		function userlogin()
	        {
	           if(document.userLogin.loginname.value=="")
	           {
	               alert("请输入账号");
	               return;
	           }
	           if(document.userLogin.loginpw.value=="")
	           {
	               alert("请输入密码");
	               return;
	           }
	           document.getElementById("indicator").style.display="block";
	           loginService.userlogin(document.userLogin.loginname.value,document.userLogin.loginpw.value,1,callback);
	        }
	        
	        function callback(data)
			{
			    document.getElementById("indicator").style.display="none";
			    if(data=="no")
			    {
			        alert("账号或密码错误");
			    }
			    if(data!="no")//返回的data就是用户的id
			    {
			        alert("通过验证,登录成功");
			        var url="<%=path %>/qiantai/default.jsp";
			        window.location.href=url;
			    }
			}
	</script>
  </head>