java大神，求教，急提问

两个html页面，a和b，a里面有您好两个字和登录按钮，b里面有返回按钮，我想点击登录按钮跳转到b里面，再点击返回按钮，跳转到a里面，但是，a里面的内容为“您好，***”，就没有登录按钮了，原理和登陆之后跳转到当前页的原理一样，求代码编写，java代码，真心请教大神！！！

http://blog.csdn.net/lee353086/article/details/8080933

http://www.cnblogs.com/xiaoer/archive/2011/03/27/1989298.html

可参考下面代码

登录login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

-->

用户名:

密码:

处理表单loginAction.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String username=request.getParameter("username");
String password=request.getParameter("password");
if(username.equals("admin")&&password.equals("admin")){ //这里是模拟,实际和数据库打交道
response.sendRedirect("index.jsp");//跳转到你要的界面
}else{
response.sendRedirect("login.jsp");
}
%>

 登录login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    <title>My JSP 'login.jsp' starting page</title>
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

  <body>
    <form name="loginForm" action="loginAction.jsp" method="post">
        用户名:<input type="text" name="username"/><br/>
        密码:<input type="text" name="password"/><br/>
       <input type="submit" value="提交"/>
       <input type="reset" value="重置"/>
    </form>
  </body>
</html>
处理表单loginAction.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    String username=request.getParameter("username");
    String password=request.getParameter("password");
    if(username.equals("admin")&&password.equals("admin")){ //这里是模拟,实际和数据库打交道
        response.sendRedirect("index.jsp");//跳转到你要的界面
    }else{
        response.sendRedirect("login.jsp");
    }
%>