JSP第八周练习

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>登录</title>
 7   </head> 
 8   <body>
 9       <script type="text/javascript">
10           function validate(){
11               if(loginForm.uname.value == ""){
12                   alert("账号不能为空！");
13                   return;
14               }
15               if(loginForm.upwd.value == ""){
16                   alert("密码不能为空！");
17                   return;
18               }
19               loginForm.submit();
20           }
21       </script>
22     <form action="dologin.jsp" name="loginForm" method="post">
23         <table  border="0"  cellpadding="10">
24             <tr><td>用户名：</td>
25                 <td><input type="text" name="uname"></td>
26             </tr>
27             <tr><td>密码：</td>
28                 <td><input type="password" name="upwd"></td>
29             </tr>
30             <tr>
31                 <td><input type="button" value="登录" onclick="validate()"></td>
32             </tr>
33         </table>
34     </form>
35     
36   </body>
37 </html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    request.setCharacterEncoding("UTF-8");
    String uname = request.getParameter("uname");
    String upwd = request.getParameter("upwd");
    if(upwd.equals(uname)){
        session.setAttribute("uname", uname);
        request.getRequestDispatcher("main.jsp").forward(request, response);
    }else{
        
         response.sendRedirect("login.jsp");
    }
    
 %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>  
    <title>登录Two</title>
  </head> 
  <body>
  </body>
</html>

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%
 3     String uname = (String) session.getAttribute("uname");
 4     if (uname == null) {
 5         response.sendRedirect("login.jsp");
 6     } else {
 7 
 8         out.print("欢迎" + uname + "登录！");
 9     }
10 %>
11 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
12 <html>
13 <head>
14 <title></title>
15 </head>
16 <body>
17     <a href="login.jsp">退出登录</a>
18 </body>
19 </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 <%
 3     String uname = (String) session.getAttribute("uname");
 4     if (uname == null) {
 5         response.sendRedirect("login.jsp");
 6     } else {
 7 
 8         out.print("欢迎" + uname + "登录！");
 9     }
10 %>
11 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
12 <html>
13 <head>
14 <title></title>
15 </head>
16 <body>
17     <a href="login.jsp">退出登录</a>
18     <form action="car.jsp" method="post">
19         <table border="1" width="600px" height="300px">
20             <thead>
21                 <tr>
22                     <th>商品名称</th>
23                     <th>价格</th>
24                     <th>加购</th>
25                 </tr>
26             </thead>
27             <tbody>
28                 <tr>
29                     <td>橙子</td>
30                     <td>5</td>
31                     <td><input type="checkbox" name="gw" value="橙子"></td>
32                 </tr>
33                 <tr>
34                     <td>西瓜</td>
35                     <td>2</td>
36                     <td><input type="checkbox" name="gw" value="西瓜"></td>
37                 </tr>
38                 <tr>
39                     <td>苹果</td>
40                     <td>1</td>
41                     <td><input type="checkbox" name="gw" value="苹果"></td>
42                 </tr>
43                 <tr>
44                     <td colspan="3"><input type="submit" value="加购"></td>
45                 </tr>
46             </tbody>
47         </table>
48     </form>
49 </body>
50 </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></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>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title></title>
  </head>
  <body>
      <h2>购物车：</h2>
        <%
          request.setCharacterEncoding("UTF-8");
          String[] gw = request.getParameterValues("gw");
          if(gw == null){
              out.print("购物车为空！");
          }else{
              for(int i = 0; i < gw.length; i++){
                  out.print(gw[i]+"<br>");
              }
          }
       %>
  </body>
</html>

posted @ 2022-04-24 21:47 L'童话故事阅读(26) 评论(0) 收藏举报

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JSP第八周练习

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