第八周作业

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。 
 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <!DOCTYPE HTML>
 3 <html>
 4 <head>
 5 <meta charset="utf-8">
 6 <title></title>
 7 </head>
 8 <body>
 9     <%
10         if (session.getAttribute("uname") == null) {
11             response.sendRedirect("login.jsp");
12         } else {
13             String uname = (String) session.getAttribute("uname");
14             out.print("欢迎" + uname + "</br>");
15     %>
16     <a href="logout.jsp">退出登录</a>
17     <%
18         }
19     %>
20 </body>
21 </html>
 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <!DOCTYPE HTML>
 3 <html>
 4 <head>
 5 <meta charset="utf-8">
 6 <title></title>
 7 </head>
 8 <body>
 9     <form name="formName" action="dologin.jsp" method="post">
10     
11         <input name="uname"><br>
12         <input type="password" name="password"><br>
13         <input type="button" value="登录" onclick="login()"> 
14     </form>
15     <script type="text/javascript">
16         function login(){
17             if(formName.uname.value==""||formName.password.value==""){
18                 alert("账号或密码不能为空!");
19                 return;
20             }
21             formName.submit();
22         }
23     </script>
24 </body>
25 </html>
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 <%
 3     request.setCharacterEncoding("utf-8");
 4 %>
 5 <!DOCTYPE HTML>
 6 <html>
 7 <head>
 8 <title>•</title>
 9 </head>
10 <body>
11     <%
12         String uname = request.getParameter("uname");
13         String password = request.getParameter("password");
14         if (uname.equals(password)) {
15             session.setAttribute("uname", uname);
16             request.getRequestDispatcher("main.jsp").forward(request,
17                     response);
18         } else {
19     %>
20     <script type="text/javascript">
21         alert("登录失败");
22     </script>
23     <%
24         request.getRequestDispatcher("login.jsp").forward(request,
25                     response);
26         }
27     %>
28 </body>
29 </html>
 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <!DOCTYPE HTML>
 3 <html>
 4   <head>
 5     <meta charset="utf-8">
 6     <title></title>
 7   </head>
 8   <body>
 9     <%session.invalidate(); %>
10     <script type="text/javascript">
11         window.location.href="main.jsp";
12     </script>
13   </body>
14 </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"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'main.jsp' starting page</title>
</head>
 
<body>
    
    
    
    <br>
    <form action="a.jsp">
        <hr>
        是否加入购物车
        <br> 
        <input name="item" type="checkbox" value="jiugui">花生 5元<br>
         <input name="item" type="checkbox" value="qiaqia">瓜子 6元<br> 
         <input name="item" type="checkbox" value="baisuishan">矿泉水 3元<br>
        <hr>
        <input type="submit" value="加入购物车">
    </form>
    <a href="loginout.jsp">退出登录</a>
 
 
</body>
<html>
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
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 'a.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  <%
        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");
        }
    %>
  <body>
    This is my JSP page. <br>
  </body>
<html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'buy.jsp' starting page</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 on 2022-04-24 15:04  觊·觎  阅读(8)  评论(0)  编辑  收藏  举报

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