第八周作业

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>first</title>
  </head>  
  <body>
  <script type="text/javascript">
  function check(){
  if(login.account.value=="")
  {
  alert("请输入账号");
  return;
  }
  else if(login.password.value=="")
  {
  alert("请输入密码");
  return;
  }
  login.submit();
  }</script>
  <h3>登录</h3>
    <form action="check.jsp">
    账号：<input type="text" name="account"><br>
    密码：<input type="password" name="password"><br>
    <input type="checkbox" value="注册会员">注册会员
        <input type="checkbox" value="不注册会员">不注册会员<br>
    <input type="submit" value="登录">
    </form>
    <% %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>check</title>

  </head>
  
  <body><%
  String account=request.getParameter("account");
  String password=request.getParameter("password");
  if(password.equals(account)){
  session.setAttribute("account",account);
  request.getRequestDispatcher("Login3.jsp").forward(request,response) ;}
  else{
  request.getRequestDispatcher("login2.jsp").forward(request,response);
  }%>
    <br>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>
    <title>登陆成功</title>
</head>
<body>
<h2>登录成功</h2>
<a href="LoginOut.jsp">退出登录</a>

</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
    <title>登陆失败</title>
</head>
<body>
<h1>登陆失败!</h1>
</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"%>
<%
    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>
<title>My JSP 'index.jsp' starting page</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("login.jsp");
    %>
    欢迎你<%=uname%><br>
    <br>
    <a href="quit.jsp">退出登录</a>
    <hr>
    商品展示：
    <br> 欢迎进入水果商城：
    <br>
    <hr>
    <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="荔枝">
        荔枝 9.99/kg<br> <input type="checkbox" name="list" value="桃子">
        桃子 6.88/kg<br> <input type="checkbox" name="list" value="西瓜">
        西瓜 7.99/kg<br>
        <hr>
        <input type="submit" value="加入购物车">

    </form>
</body>
</html>
<%@ 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>
<title>My JSP 'index.jsp' starting page</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 @ 2022-04-23 22:09  刘德广  阅读(24)  评论(0)  编辑  收藏  举报