JSP权限控制源码

偶然翻到很多年前，刚学Java的时候学的一段代码。或许，现在让写，还写不出来了。技术如潮、不进则退。还是年轻好啊，思路清晰、精神充沛。

[java]
<%@ page contentType="text/html; charset=gb2312" %>

<%@ page import="qlsoft.PWebs.Business.PermitBean" %>
<jsp:useBean id="permitBean" scope="session" class="qlsoft.PWebs.Business.PermitBean" />
<%@ page import="qlsoft.PWebs.Business.MemberBean" %>
<jsp:useBean id="memberBean" scope="session" class="qlsoft.PWebs.Business.MemberBean" />
<%
    String action= request.getParameter("action");
%>
        <script language="javascript">
            //alert("Permit request action:" + "<%=action%>");
        </script>
    <%
    if("login".equalsIgnoreCase(action))
    {//会员登录:验证用户身份,并设置Session变量及已登录标志
        //获取登录参数
        String userName= request.getParameter("username");
        String userPwd= request.getParameter("password");
        System.out.println("帐号:" + userName + "密码:" + userPwd);
        if(userName == null || userName == "" || userPwd == null || userPwd == "")
        {//请求的参数无效
    %>
        <script language="javascript">
            alert("没有会员登录必须的请求参数！");
            window.history.go(-1);
        </script>
    <%
        }
        else
        {//参数有效
            if(permitBean.memberLogin(userName,userPwd))
            {//登录成功
                //chengxiaoxu 2004-05-25 remark code in here to best
                session.setAttribute("sessionPermit",permitBean);
                PermitBean ssnPermit = (PermitBean)session.getAttribute("sessionPermit");

                String strLogin = ssnPermit.getIsLogin() ? "登录成功！" : "登录失败？？？";
                String ackName = ssnPermit.getMgrAckName();
                System.out.println("会员帐号:" + strLogin + "\n" + ackName);
                if(memberBean.getBeanInfoByID(ssnPermit.getMemberID()))
                {
                    System.out.println("提取会员信息成功！");
                    session.setAttribute("sessionMember",memberBean);
                }

        %>
            <script language="javascript">
                //alert("<%=strLogin %>");
                //alert("<%=permitBean.getMsg() %>");
                //window.target="_blank";
                //此处完成后应该是会员管理中心主页面
                window.location="membermain.jsp";
            </script>
        <%
            }
            else
            {//登录失败
        %>
            <script language="javascript">
                alert("<%=permitBean.getMsg() %>");
                window.history.go(-1);
            </script>
        <%
            }//End of <登录失败>
        }//End of <参数有效>
    %>
<%
    }//End of <会员登录>
    else if("update".equalsIgnoreCase(action))
    {//修改会员密码
      //获取修改参数
      String oldPwd= request.getParameter("oldPassword");
      String newPwd= request.getParameter("newPassword1");
      if(oldPwd == null || oldPwd == "" || newPwd == null || newPwd == "")
      {//请求的参数无效
    %>
            <script language="javascript">
       &nbs

补充：Web开发 , Jsp ,