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"%>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
    <form name="formName" action="dologin.jsp" method="post">
    
        <input name="uname"><br>
        <input type="password" name="password"><br>
        <input type="button" value="登录" onclick="login()"> 
    </form>
    <script type="text/javascript">
        function login(){
            if(formName.uname.value==""||formName.password.value==""){
                alert("账号或密码不能为空!");
                return;
            }
            formName.submit();
        }
    </script>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <%session.invalidate(); %>
    <script type="text/javascript">
        window.location.href="main.jsp";
    </script>
  </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
    <%
        if (session.getAttribute("uname") == null) {
            response.sendRedirect("login.jsp");
        } else {
            String uname = (String) session.getAttribute("uname");
            out.print("欢迎" + uname + "</br>");
    %>
    <a href="logout.jsp">退出登录</a>
    <%
        }
    %>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
    request.setCharacterEncoding("utf-8");
%>
<!DOCTYPE HTML>
<html>
<head>
<title>•</title>
</head>
<body>
    <%
        String uname = request.getParameter("uname");
        String password = request.getParameter("password");
        if (uname.equals(password)) {
            session.setAttribute("uname", uname);
            request.getRequestDispatcher("main.jsp").forward(request,
                    response);
        } else {
    %>
    <script type="text/javascript">
        alert("登录失败");
    </script>
    <%
        request.getRequestDispatcher("login.jsp").forward(request,
                    response);
        }
    %>
</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"%>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<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%><br>
    <br>
    <hr>
    商品展示：
    <br> 欢迎进入水果商城：
    <br>
    <hr>
    <form action="gouwuche.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"%>
<!DOCTYPE HTML >
<html>
  <head>
</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 @ 2022-04-24 13:54  王城凯  阅读(31)  评论(0)  编辑  收藏  举报