JSP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 
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>    
 6     <title>login</title>
 7     
 8   </head>
 9   
10   <body>
11    <form  name="form" action="dologin.jsp" method="post">
12       用户名：<input type="text" name="uname"><br>
13       密码：<input type="password" name="upwd"><br>
14     <input type="submit" value="登录" >    
15     </form>
16   </body>
17 </html>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>dologin</title>
    
  </head>
  
  <body>
     <%
    request.setCharacterEncoding("utf-8");
    String uname=request.getParameter("uname");
    String upwd=request.getParameter("upwd");
    if(uname.equals(upwd)){
        session.setAttribute("uname", uname);
        request.getRequestDispatcher("main.jsp").forward(request,response);
    }else{
    request.getRequestDispatcher("no.jsp").forward(request,response);
    }
     %>
  </body>
</html>

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>    
 6     <title>main</title>
 7     
 8   </head>
 9   
10   <body>
11     <h1>登陆成功！</h1>
12 
13     <%
14         String uname = (String) session.getAttribute("uname");
15         if (uname == null)
16             response.sendRedirect("login.jsp");
17             
18     %>
19     
20     <form name="form1" action="loout.jsp" method="post">
21     <input type="submit" value="退出登录">
22     </form>
23     
24     
25    
26 </body>
27 </html>

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 
 3 <html>
 4 <head>
 5 
 6 
 7 <title>no</title>
 8 
 9 </head>
10 
11 <body>
12     <h1>登陆失败！！</h1>
13     <%response.setHeader("refresh", "5;url=login.jsp");%>
14 
15 </body>
16 </html>

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>    
 6     <title>logout</title>
 7     
 8   </head>
 9   
10   <body>
11     <%
12     session.invalidate();
13     response.setHeader("refresh", "5;url=login.jsp");
14      %>
15   </body>
16 </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）

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 3 <html>
 4  <head>
 5   </head>
 6    <script type="text/javascript">
 7     function v() {
 8         if (loginForm.uname.value=="") {
 9             alert("账号不能为空！");
10             return;
11         }
12         if (loginForm.password.value=="") {
13             alert("密码不能为空！");
14             return;
15         }
16         loginForm.submit();
17     }
18     </script>
19   <body>
20   <form name="loginForm" action="m.jsp" method="post">
21   账号：<input type="text" name="uname"><br>
22   密码：<input type="password" name="password"> <br> 
23   <input type="submit" value="登录" onclick="v()">
24   </form>  
25   </body>
26 </html>

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 3 <html>
 4   <head>
 5  </head>
 6   <body>
 7    <%
 8         request.setCharacterEncoding("utf-8");
 9         String uname = request.getParameter("uname");
10         String password = request.getParameter("password");
11         if (uname.equals(password)) {
12             session.setAttribute("uname", uname);
13             request.getRequestDispatcher("J.jsp").forward(request, response);
14         } else {
15             response.sendRedirect("q.jsp");
16         }
17     %>
18  </body>
19 </html>

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 3 <html>
 4   <head>
 5  </head>
 6   <body>
 7   <%
 8   String uname=(String)session.getAttribute("uname");
 9   if(uname==null)
10       response.sendRedirect("index.jsp");
11    %>
12      <h3>羊村的世界</h3>
13   <form action="7.jsp">
14   <hr>
15   是否加入购物车？<br>  
16   <input name="item" type="checkbox" value="vip">
17   喜羊羊            88 <br>  
18   <input name="item" type="checkbox" value="card">
19   美羊羊            价格随样式决定 <br>  
20   <input name="item" type="checkbox" value="calendar">
21   灰太狼             998<br>  
22   <input name="item" type="checkbox" value="pb">
23   红太狼              88<br>
24   <input name="item" type="checkbox" value="card book">
25   沸羊羊              88 <br>  
26   <hr>
27   <input type="submit" value="加入购物车">
28   </form>
29   <a href="n.jsp">退出登录</a> <br>
30  
31  </body>
32 </html>

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 3 <html>
 4   <head>
 5  </head>
 6   <body>
 7  购物车:<br>
 8     <%
 9     request.setCharacterEncoding("utf-8");
10     String itemName[]=request.getParameterValues("item");
11     if(itemName==null){
12     out.print("购物车暂无任何东西");
13     }
14     else{
15     for(int l=0;l<itemName.length;l++){
16     out.print("("+(l+1)+")"+itemName[l]+"<br>");
17     }
18     }
19      %>
20  </body>
21 </html>

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 3 <html>
 4   <head>
 5  </head>
 6  <%String src=request.getParameter("id"); %>
 7   <body>
 8   登陆失败，请重试
 9     <%
10       response.setHeader("refresh", "5;url=index.jsp");
11     %>
12  </body>
13 </html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
 </head>
  <body>
 <%
    session.invalidate();
    response.setHeader("refresh", "5;url=index.jsp");
  %>
退出成功!
 </body>
</html>

posted @ 2022-04-24 11:25 唐一南阅读(33) 评论(0) 收藏举报

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Yinan Tang

JSP第八周作业

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