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>
    
    <title>My JSP 'Work1_login.jsp' starting page</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 name="loginForm" action="Work1_dologin.jsp" method="post">
        
    用户名:<input type="text" name="uname" ><br> 
    密码: <input  type="password" name="upwd" >
    
        <input type="button" value="登录" onClick="validate()">    
    </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 (uname.equals(upwd)){

        session.setAttribute("uname", uname);
        request.getRequestDispatcher("Work1_main.jsp").forward(request,response);
    }
    else{
        
        response.sendRedirect("Work1_no.jsp");
    }
%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>My JSP 'Work_main.jsp' starting page</title>
    
  </head>
  
  <body>
 <%
  
  String uname=(String)session.getAttribute("uname");
  //如果他是空,说明没登陆,直接访问该页面了
  if(uname==null)
      response.sendRedirect("Work1_login.jsp");
  
   %>
 
  欢迎你<%=uname %> 
  
  <a href="Work1_logout.jsp">退出登录</a>

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>My JSP 'Work1_logout.jsp' starting page</title>
    
  </head>
  
  <body>
       <%
    
    session.invalidate();
    response.setHeader("refresh", "2;url=Work1_login.jsp");
    
     %>
退出成功
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
   
    <title>My JSP 'Work1_no.jsp' starting page</title>

  </head>
  
  <body>
   <h1>登陆失败!!</h1>
    <%response.setHeader("refresh", "2;url=Work1_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"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>My JSP 'Work2_login.jsp' starting page</title>
    
  </head>
  
  <body>
   <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 name="loginForm" action="Work2_dologin.jsp" method="post">
        
    用户名:<input type="text" name="uname" ><br> 
    密码: <input  type="password" name="upwd" >
    
        <input type="button" value="登录" onClick="validate()">    
    </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 (uname.equals(upwd)){

        session.setAttribute("uname", uname);
        request.getRequestDispatcher("Work2_main.jsp").forward(request,response);
    }
    else{
        
        response.sendRedirect("Work2_no.jsp");
    }
%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>My JSP 'Work2_main.jsp' starting page</title>
   
  </head>
  
  <body>
   <%
  
  String uname=(String)session.getAttribute("uname");
  //如果他是空,说明没登陆,直接访问该页面了
  if(uname==null)
      response.sendRedirect("Work2_login.jsp");
  
   %>
 
  欢迎你<%=uname %> 
   
   
  <form action="Work2_shopping.jsp" method="post">
   苹果 <input type="checkbox" name="shopping" value="苹果">加入购物车 <br>
   香蕉 <input type="checkbox" name="shopping" value="香蕉">加入购物车 <br>
   白梨 <input type="checkbox" name="shopping" value="白梨">加入购物车 <br>
   <input type="submit" value="购物车">
  </form>
  <a href="Work2_logout.jsp">退出登录</a>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>My JSP 'Work2_jump.jsp' starting page</title>

  </head>
  
  <body>

    <%
    request.setCharacterEncoding("utf-8");
    String shoppingName[]=request.getParameterValues("shopping");
    if(shoppingName==null){
     out.print("未添加购物车");
    }else{
    for(int i=0;i<shoppingName.length;i++){
    out.print("("+(i+1)+")"+shoppingName[i]+"<br>");
    }
    }
    
     %>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>My JSP 'Work2_logout.jsp' starting page</title>
    
  </head>
  
  <body>
       <%
    
    session.invalidate();
    response.setHeader("refresh", "2;url=Work2_login.jsp");
    
     %>
退出成功
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
   
    <title>My JSP 'Work2_no.jsp' starting page</title>

  </head>
  
  <body>
   <h1>登陆失败!!</h1>
    <%response.setHeader("refresh", "2;url=Work2_login.jsp");%>
  </body>
</html>

 

posted @ 2022-04-24 18:07  飞七  阅读(22)  评论(0编辑  收藏  举报