JSP第六次上机作业

1.登陆 login.jsp
输入用户名密码,判断用户名和密码相同,登陆成功,session中保存用户的用户名,进入主页main.jsp,主页有一个退出按钮,点击,回到登陆页login.jsp。要求:退出登录后,如果在浏览器直接输入主页main.jsp,访问不了,直接跳到登陆页。

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
  <head>    
    <title></title>
    <script type="text/javascript">
    function v() {
        if (loginForm.uname.value=="") {
            alert("账号不能为空!");
            return;
        }
        if (loginForm.password.value=="") {
            alert("密码不能为空!");
            return;
        }
        loginForm.submit();
    }
    </script>
  </head>  
  <body>
  <form name="loginForm" action="1.oblogin.jsp" method="post">
  账号:<input type="text" name="uname"><br>
  密码:<input type="password" name="password"> <br> 
  <input type="submit" value="登录" onclick="v()">
  </form>  
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>
<title></title>
</head>
<body>
    <%
        request.setCharacterEncoding("utf-8");
        String uname = request.getParameter("uname");
        String password = request.getParameter("password");
        if (uname.equals(password)) {
            session.setAttribute("uname", uname);
            request.getRequestDispatcher("1.main.jsp").forward(request, response);
        } else {
            response.sendRedirect("1.false.jsp");
        }
    %>

</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
  <head>    
    <title></title>
  </head>  
  <body>
  <%
  String uname=(String)session.getAttribute("uname");
  //如果他是空,说明没登陆,直接访问该页面了
  if(uname==null)
      response.sendRedirect("1.login.jsp");
   %>
  <a href="1.out.jsp">退出登录</a> <br>
  欢迎进入主页面
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>
<title></title>
</head>
<body>
    登陆失败,请重试!
    <%
      response.setHeader("refresh", "5;url=1.login.jsp");
    %>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
  <head>    
    <title></title>
  </head>  
  <body>
  <%
    session.invalidate();
    response.setHeader("refresh", "5;url=1.login.jsp");
  %>
退出成功!
  </body>
</html>

 

2.购物车
和上一题一起,在main.jsp中做一个商品展示,里面显示3个商品名和价格 ,每一个后面有一个加入购物车按钮,main.jsp中有一个按钮(或者超链接)可以显示购物车show.jsp 。(选作:在购物车show.jsp中加删除按钮删除商品)

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
  <head>    
    <title></title>
  </head>  
  <body>
  <%
  String uname=(String)session.getAttribute("uname");
  //如果他是空,说明没登陆,直接访问该页面了
  if(uname==null)
      response.sendRedirect("1.login.jsp");
   %>
  <a href="1.out.jsp">退出登录</a> <br>
  <h2>欢迎进入美妆频道</h2>
  <form action="2.show.jsp">
  <hr>
  是否加入购物车?<br>  
  <input name="item" type="checkbox" value="L'Oreal Paris purple iron eye cream">
  巴黎欧莱雅紫熨斗眼霜      $99999<br>  
  <input name="item" type="checkbox" value="OLAY spot a small white bottle">
  OLAY淡斑小白瓶      $399<br>  
  <input name="item" type="checkbox" value="NYX Utopia eye shadow plate">
  NYX乌托邦眼影盘      $319<br>
  <hr>
  <input type="submit" value="加入购物车">
  </form>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
  <head>   
    <title></title>
  </head>  
  <body>
  <h2>购物车</h2>
    <%
    request.setCharacterEncoding("utf-8");
    String itemName[]=request.getParameterValues("item");
    if(itemName==null){
    out.print("购物车为空");
    }
    else{
    for(int k=0;k<itemName.length;k++){
    out.print("("+(k+1)+")"+itemName[k]+"<br>");
    }
    }
     %>
  </body>
</html>

 

posted @ 2022-04-20 15:13  小猪哏哏  阅读(24)  评论(0编辑  收藏  举报