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。

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>登录</title>
  </head>
  <body>
      <script type="text/javascript">
          function validate(){
              if(loginForm.uname.value == ""){
                  alert("账号不能为空!");
                  return;
              }
              if(loginForm.upwd.value == ""){
                  alert("密码不能为空!");
                  return;
              }
              loginForm.submit();
          }
      </script>
    <form action="dologin.jsp" name="loginForm" method="post">
        <table  border="0"  cellpadding="10">
            <tr><td>用户名:</td>
                <td><input type="text" name="uname"></td>
            </tr>
            <tr><td>密码:</td>
                <td><input type="password" name="upwd"></td>
            </tr>
            <tr>
                <td><input type="button" value="登录" onclick="validate()"></td>
            </tr>
        </table>
    </form>

  </body>
</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>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    String uname = (String) session.getAttribute("uname");
    if (uname == null) {
        response.sendRedirect("login.jsp");
    } else {

        out.print("欢迎" + uname + "登录!");
    }
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
    <a href="login.jsp">退出登录</a>
</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)

 
posted @ 2022-04-23 17:26  15*  阅读(8)  评论(0编辑  收藏  举报