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"%>
 
<html>
<head>
 
 
<title>My JSP 'index.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="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"%>
<html>
  <head>   
    <title>My JSP 'index.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("login.jsp"); 
   %>
   
  欢迎你<%=uname %>
   
  <a href="logout.jsp">退出登录</a>
 
   
   
  </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>My JSP 'index.jsp' starting page</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

<title>My JSP 'index.jsp' starting page</title>

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

2购物车

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>main</title>
    
  </head>
  
  <body>
    <h1>登陆成功！</h1>

    <%
        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");
            
    %>
    
    <form action="show.jsp" method="post">
        商品：<br> <br>
    草莓 6.30<input type="checkbox" name="item" value="草莓">加入购物车 <br> 
    梨 4.25 <input type="checkbox" name="item" value="梨"> 加入购物车 <br> 
    香蕉 9.30<input type="checkbox" name="item" value="香蕉"> 加入购物车<br><br>
    <input type="submit" value="加入购物车">
    </form>
    
    
    
    <form name="form1" action="logout.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>    
    <title>show</title>
    
  </head>
  
  <body>
    <%
    request.setCharacterEncoding("utf-8");
    String itemName[]=request.getParameterValues("item");
    if(itemName==null){
    out.print("未添加购物车");
    }
    else{
    for(int i=0;i<itemName.length;i++){
    out.print("("+(i+1)+")"+itemName[i]+"<br>");
    }
    }
     %>
  </body>
</html>

posted @ 2022-04-24 17:31 &+-wbs 阅读(54) 评论(0) 收藏举报

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