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"%>
<%
    request.setCharacterEncoding("utf-8");
    String uname = request.getParameter("uname");
    String upwd = request.getParameter("upwd");
    if (uname.equals(upwd)){
        
        session.setAttribute("uname", uname);
        request.getRequestDispatcher("index.jsp").forward(request,response);
    }
    else{
        
        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>
    <h1>登陆失败！！！</h1>
    <%response.setHeader("refresh", "5;url=login.jsp");%>

</body>
</html>
<%@ 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>
  <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="login.jsp">退出登录</a>
<form action="buy.jsp" method="post">
</form>
</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>
 </head>
  <body>
<%
    request.setCharacterEncoding("utf-8");
    String uname = request.getParameter("uname");
    String upwd = request.getParameter("upwd");
    if (uname.equals(upwd)){
        
        session.setAttribute("uname", uname);
        request.getRequestDispatcher("index.jsp").forward(request,response);
    }
    else{
        
        response.sendRedirect("no.jsp");
    }
%>
<hr>
  是否加入购物车？<br> 
  <input name="item" type="checkbox" value="grape">
 grape           <br> 
  <input name="item" type="checkbox" value="orange">
 orange          <br> 
  <input name="item" type="checkbox" value="strawberry">
 strawberry      <br> 
  
  <hr>
  <input type="submit" value="加入购物车">
  </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>
    <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="main.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>

 

posted @ 2022-04-23 13:35  刘源丰  阅读(11)  评论(0)  编辑  收藏  举报