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"%>
<%
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>
    
  </head>
  
  <body>
    <form action="doreg.jsp" method="post">
    用户名:<input type="text" name="uname" value=""><br>
    密码:   <input type="password" name="upwd" value=""><br> 
    <input type="submit"  value="登录"><br>   
    </form>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>

  </head>
  
  <body>
   <%
    request.setCharacterEncoding("utf-8");
    String uname=request.getParameter("uname");
    String upwd=request.getParameter("upwd");
    
    if(uname.equals("admin")&&upwd.equals("admin")){
    session.setAttribute("uname",uname);
    response.sendRedirect("main.jsp");
    }
    else{
    response.sendRedirect("fault.jsp");
    
    }       
     %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>

  </head>
  
  <body>
   <%
    request.setCharacterEncoding("utf-8");
    String uname=request.getParameter("uname");
    String upwd=request.getParameter("upwd");
    
    if(uname.equals("admin")&&upwd.equals("admin")){
    session.setAttribute("uname",uname);
    response.sendRedirect("main.jsp");
    }
    else{
    response.sendRedirect("fault.jsp");
    
    }       
     %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>

  </head>
  
  <body>

     <% 
     String uname=(String)session.getAttribute("uname");  
     if(uname==null){
     response.sendRedirect("login.jsp");
     } 
      %>
  欢迎<%=uname %>
 <a href="loginout.jsp">退出登录</a>  
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>
  </head>
  
  <body>
  退出成功!
<%
session.invalidate();
response.setHeader("refresh","5;url=login.jsp");
 %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>
  </head>
  
  <body>
登录失败!
<%
session.invalidate();
response.setHeader("refresh","5;url=login.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"%>
<%
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>
    
  </head>
  
  <body>
    <form action="doreg.jsp" method="post">
    用户名:<input type="text" name="uname" value=""><br>
    密码:   <input type="password" name="upwd" value=""><br> 
    <input type="submit"  value="登录"><br>   
    </form>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>

  </head>
  
  <body>
   <%
    request.setCharacterEncoding("utf-8");
    String uname=request.getParameter("uname");
    String upwd=request.getParameter("upwd");
    
    if(uname.equals("admin")&&upwd.equals("admin")){
    session.setAttribute("uname",uname);
    response.sendRedirect("main.jsp");
    }
    else{
    response.sendRedirect("fault.jsp");
    
    }       
     %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>

  </head>
  
  <body>

     <% 
     request.setCharacterEncoding("utf-8");
     String uname=(String)session.getAttribute("uname");  
     if(uname==null){
     response.sendRedirect("login.jsp");
     } 
      %>
  欢迎<%=uname %>
  <form action="buy.jsp" method="post">
   苹果 <input type="checkbox" name="sp" value="苹果"><a href="">加入购物车</a> <br>
   香蕉 <input type="checkbox" name="sp"value="香蕉"><a href="">加入购物车</a> <br>
   樱桃 <input type="checkbox" name="sp" value="樱桃"><a href="">加入购物车</a> <br>
   <input type="submit" value="购物车">
  </form>
 <a href="loginout.jsp">退出登录</a>  
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
  <head>
  </head>
  
  <body>
    <%
    request.setCharacterEncoding("utf-8");
    String spName[]=request.getParameterValues("sp");
    if(spName==null){
     out.print("未添加购物车");
    }else{
    for(int i=0;i<spName.length;i++){
    out.print("("+(i+1)+")"+spName[i]+"<br>");
    }
    }
    
     %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>
  </head>
  
  <body>
  退出成功!
<%
session.invalidate();
response.setHeader("refresh","5;url=login.jsp");
 %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>
  </head>
  
  <body>
登录失败!
<%
session.invalidate();
response.setHeader("refresh","5;url=login.jsp");
 %>
  </body>
</html>

 

posted @ 2022-04-24 20:54  王佳瑜  阅读(20)  评论(0编辑  收藏  举报