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。

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"%>

<html>
<head>




<title> </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="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)){
        //转发到ok页面,但是url没变
        session.setAttribute("uname", uname);
        request.getRequestDispatcher("main.jsp").forward(request,response);
    }
    else{
        //重定向回login.jsp，浏览器url也变
        response.sendRedirect("no.jsp");
    }
%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>    
    <title> </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("login.jsp");
  
   %>
  
  
  
 
  
  欢迎你<%=uname %>
  
  <a href="logout.jsp">退出登录</a>
<form action="buy.jsp" method="post">
    
        <table border="1" cellpadding="0" cellspacing="0" width="500">

            <thead>
                <tr>
                    <th>商品名称</th>
                    <th>价格</th>
                    <th>加购</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>牛奶</td>
                    <td>5</td>
                    <td align="center"><input type="checkbox" name="sp" value="牛奶">
                    </td>
                </tr>
                <tr>
                    <td>面包</td>
                    <td>3</td>
                    <td align="center"><input type="checkbox" name="sp" value="面包">
                    </td>
                </tr>
                <tr>
                    <td>香肠</td>
                    <td>2</td>
                    <td align="center"><input type="checkbox" name="sp" value="香肠">
                    </td>
                </tr>
                <tr>
                    <td colspan="3"><input type="submit" value="加购">
                    </td>
                </tr>
            </tbody>
        </table>
    </form>
  
  
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>    
    <title> </title>
  </head>  
  <body> 
<%
        request.setCharacterEncoding("utf-8");
        String itemName[]=request.getParameterValues("sp");
        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="main.jsp">返回</a>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>


<title> </title>

</head>

<body>
    <%
    
    session.invalidate();
    response.setHeader("refresh", "5;url=login.jsp");
    
     %>
退出成功
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>


<title> </title>

</head>

<body>
    <h1>登陆失败！！</h1>
    <%response.setHeader("refresh", "5;url=login.jsp");%>

</body>
</html>

 

posted @ 2022-04-24 16:42  镜影2613  阅读(8)  评论(0)  编辑  收藏  举报