jsp第八周作业

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

<body bgcolor=#ccffcc>
    <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"%>
<%
    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>
<title>My JSP 'index.jsp' starting page</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 {
            response.sendRedirect("fail.jsp");
        }
    %>
</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>
<title>My JSP 'index.jsp' starting page</title>
</head>

<body bgcolor=#FFccff>
    <%
        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%><br>
    <br>
    <a href="tuichu.jsp">退出登录</a>
</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>
<title>My JSP 'index.jsp' starting page</title>
</head>

<body>
    <%
        session.invalidate();
        response.setHeader("refresh", "5;url=login.jsp");
    %>
    <h1>退出登录成功!</h1>
</body>
</html>

2.购物车
和上一题一起，在main.jsp中做一个商品展示，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show.jsp 。（选作：在购物车show.jsp中加删除按钮删除商品）

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

<body bgcolor=#FFccff>
    <%
        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%><br>
    <br>
    <a href="tuichu.jsp">退出登录</a>
    <hr>
    商品展示：
    <br> 欢迎进入水果商城：
    <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="荔枝">
        荔枝 9.99/kg<br> <input type="checkbox" name="list" value="桃子">
        桃子 6.88/kg<br> <input type="checkbox" name="list" value="西瓜">
        西瓜 7.99/kg<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>
<title>My JSP 'index.jsp' starting page</title>
</head>

<body bgcolor=#eeccft>
    <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 @ 2022-04-24 21:33  XLKL  阅读(25)  评论(0)  编辑  收藏  举报