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。

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head> <!-- eight.jsp -->
  </head>
  <body>
 <form action="eight02.jsp" method="post" name="eight">
             请输入账号:<input name="name" type="text"/><br/>
             请输入密码:<input name="password" type="password"/><br/>
           <input type="button" value="登录" onclick="denglu()"/>
      <script type="text/javascript">
         function denglu(){
            if(eight.name.value==""){
               alert("账号不能为空!");
               return;
            }
             if(eight.password.value==""){
               alert("密码不能为空!");
               return;
            }
            eight.submit();
         } 
     </script>
   </form>
  </body>
  </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head> <!-- eight01.jsp -->
  </head>
  <body>
<% 
        String name=request.getParameter("name");
        String password=request.getParameter("password");
        if(name.equals(password)){
           session.setAttribute("yhm", name);
           request.getRequestDispatcher("eight02.jsp").forward(request, response);
        }else{
           request.getRequestDispatcher("eight04.jsp").forward(request, response);
        }
    %>  
  </body>
  </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head> <!-- eight02.jsp -->
  </head>
  <body>
<%
    String name=(String) session.getAttribute("yhm");
    if(name==null){
        out.print("未登录,3秒后跳转登录页!");
        response.setHeader("refresh", "3;url=eight.jsp");
    } else{
        out.print("用户名:"+name+"登陆成功!");
%>
     <form action="eight03.jsp" method="post" >
          <input type="submit" value="退出登录" /> 
     </form>
<% 
    }
%>  
  </body>
  </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head> <!-- eight03.jsp -->
  </head>
  <body>
     <h3>退出成功,3秒后返回登录页!</h3>
        <%
           session.invalidate();
           response.setHeader("refresh", "3;url=eight.jsp");
         %>
  </body>
  </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head> <!-- eight04.jsp -->
  </head>
  <body>
     <h3>登陆失败,3秒后返回登陆页</h3>
        <%
        session.invalidate();
        response.setHeader("refresh", "3;url=eight.jsp");
        %>
  </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

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head> <!-- eight05.jsp -->
  </head>
  <body>
<%
    request.setCharacterEncoding("utf-8");
    String name=(String) session.getAttribute("yhm");
    if(name==null){
        out.print("未登录,3秒后跳转登录页!");
        response.setHeader("refresh", "3;url=eight.jsp");
    } else{
        out.print("用户名:"+name+"登陆成功!");   %>
     <form action="tuichu.jsp" method="post" >
          <input type="submit" value="退出登录" /> 
     </form>
     <% 
    }
     %>   
     
     
     <form action="eight05..jsp" method="post">
                 苹果  &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp 价格:5
         <input type="checkbox" value="苹果" name="sg" />加入购物车<br />
                 橘子 &nbsp&nbsp&nbsp&nbsp&nbsp 价格:5
         <input type="checkbox" value="橘子" name="sg"/>加入购物车<br />
                 香蕉 &nbsp&nbsp 价格:5.5
         <input type="checkbox" value="香蕉" name="sg" />加入购物车<br />
         <input type="submit" value="购买"/>
     </form>
     </script>
  </body>
  </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head> <!-- eight06.jsp -->
  </head>
  <body>
<%
        request.setCharacterEncoding("utf-8");
        String itemName[]=request.getParameterValues("gwc");
        if(itemName==null){
            out.print("未添加购物车");
        }else{
            out.print("您购买的商品为:"+"<br/>");
            for(int i=0;i<itemName.length;i++){
                out.print("("+(i+1)+")"+itemName[i]+"<br>");
            }
        }
     %>
     <a href="eight05.jsp">返回</a>
  </body>
  </html>

 

 

 

posted @ 2022-04-24 16:30  满目星河☆  阅读(2)  评论(0编辑  收藏  举报