JSP第六次作业

1、登陆 login.jsp
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>login</title>
    
  </head>
  
  <body>
   <form  name="form" action="dologin.jsp" method="post">
      用户名：<input type="text" name="uname"><br>
      密码：<input type="password" name="upwd"><br>
    <input type="submit" value="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>dologin</title>
    
  </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("main.jsp").forward(request,response);
    }else{
    request.getRequestDispatcher("no.jsp").forward(request,response);
    }
     %>
  </body>
</html>

<%@ 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");
        if (uname == null)
            response.sendRedirect("login.jsp");
            
    %>
    
    <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"%>

<html>
<head>


<title>no</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"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>logout</title>
    
  </head>
  
  <body>
    <%
    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"%>
<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>
    <hr>
    商品展示:
    <br>
    <hr>
    <form action="show.jsp" method="post">
        请选择要加入购物车的商品：<br> <input type="checkbox" name="list" value="苹果">
        苹果 ￥9.9<br> <input type="checkbox" name="list" value="橙子">
        橙子 ￥7.88<br> <input type="checkbox" name="list" value="橘子">
        橘子 ￥6.88<br>
        <hr>
        <input type="submit" value="加入购物车">

    </form>


</body>
</html>

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

<html>
<head>


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

</head>

<body>
    <h2>购物车添加的商品有：</h2>
    <%
        request.setCharacterEncoding("utf-8");
        String listName[] = request.getParameterValues("list");
        if (listName == null) {
            out.print("购物车为空！");
        } else {
            for (int i = 0; i < listName.length; i++) {
                out.print("(" + (i + 1) + ")" + listName[i] + "<br>");
            }
        }
    %>
</body>
</html>

posted @ 2022-04-23 18:15 崔宝元阅读(69) 评论(0) 收藏举报

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JSP第六次作业

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