JSP第八次作业

1.登陆
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>
    
  </head>
  
  <body>
    <form name="Login" action="dologin.jsp" method="post">

        用户名:<input type="text" name="uname"><br> 
        密码: <input  type="password" name="password"> <br>
        <input type="button" value="登录" onclick="login()">

    </form>
        <script type="text/javascript">
        function login() {
            if (Login.uname.value == "") {
                alert("账号不能为空!");
                return;
            }
            if (Login.password.value == "") {
                alert("密码不能为空!");
                return;
            }
            Login.submit();
        }
    </script>

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

<html>
  <head>
    
    <title>e</title>

  </head>
  
  <body>
      <%
        request.setCharacterEncoding("utf-8");
        String uname = request.getParameter("uname");
        String pwd = request.getParameter("password");
        if(uname.equals(pwd)){
        session.setAttribute("uname", pwd);
        request.getRequestDispatcher("main.jsp");
        }else{
        response.sendRedirect("error.jsp");
        }
    %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>  
    <title></title>
  </head>
    <body>
      <%
        String uname = (String) session.getAttribute("uname");
        if (uname == null)
            response.sendRedirect("login.jsp");
    %>
    欢迎你<%=uname%><br>
    <br>
    <a href="exit.jsp">退出登录</a>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>    
    <title></title>
  </head>  
  <body>
    <h1>登陆失败！！</h1>
    <% response.setHeader("refresh", "5;url=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=login.jsp");
    %>
    <h1>退出登录成功!</h1>
  </body>
</html>

 

 

2.购物车
和上一题一起，在main.jsp中做一个购物车，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。（选作：在购物车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");
        if (uname == null)
            response.sendRedirect("login.jsp");
    %>
    欢迎你<%=uname%><br>
    <br>
    <a href="exit.jsp">退出登录</a>
    商品展示：
    <br> 欢迎购买玩具：
    <br>
    <form action="show.jsp" method="post">
        请选择要加入购物车的商品：<br> 
        <input type="checkbox" name="list" value="悠悠球">悠悠球  50<br> 
        <input type="checkbox" name="list" value="魔方">魔方 10<br> 
        <input type="checkbox" name="list" value="奥特曼">奥特曼 30 <br>
        <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>购物车添加的商品有：</h2>
    <%
        request.setCharacterEncoding("utf-8");
        String listName[] = request.getParameterValues("list");
        if (listName == null) {
            out.print("购物车为空！");
        } else {
            for (int i = 0; i < listName.length; i++) {
                out.print("(" + (i + 1) + ")" + listName[i] + "<br>");
            }
        }
    %>
  </body>
</html>

 

 

 

 

posted @ 2022-04-24 02:12  热血青年小刘  阅读(30)  评论(0)  编辑  收藏  举报