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。

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)

index.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML >
<html>
<head>
<title></title>
</head>
<body>
   <script>
        function yz() {
            if (form.user.value == "") {
                alert('用户名不能为空');
                return;
            }
            if (form.password.value == "") {
                alert('密码不能为空');
                return;
            }
            form.submit();
        }
    </script>
    <form action="index2.jsp" method="post" name="form">
        <table>
            <tr>
                <td>用户名:</td>
                <td><input type="text" name="user"></td>
            </tr>
            <tr>
                <td>密码:</td>
                <td><input type="password" name="password"></td>
            </tr>
            <tr>
                <td><input type="button" value="登录" onclick="yz()"></td>
            </tr>
        </table>
    </form>
</body>
<html>

  index2.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>
  <body>
  <%
        String user = request.getParameter("user");
        String password = request.getParameter("password");
        if (user.equals(password)) {
            session.setAttribute("user", user);
            request.getRequestDispatcher("M.jsp").forward(request,response);
        } else {
            response.sendRedirect("index.jsp");
        }
    %>
</body>
</html>

  M.jsp

<%@ 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>
    <%
        String user = (String) session.getAttribute("user");
        if (user == null) {
            response.sendRedirect("index.jsp");
        }
    %>
    欢迎:<%=user%>
    <a href="E.jsp">退出登录</a>
    <form action="MyJSp.jsp" method="post">

        <table border="1" cellpadding="0" cellspacing="0" width="500">

            <thead>
                <tr>
                    <th>商品名称</th>
                    <th>价格</th>
                    <th>加购</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>草莓</td>
                    <td>7</td>
                    <td align="center"><input type="checkbox" name="sp" value="草莓">
                    </td>
                </tr>
                <tr>
                    <td>王者荣耀</td>
                    <td>7</td>
                    <td align="center"><input type="checkbox" name="sp" value="王者荣耀">
                    </td>
                </tr>
                <tr>
                    <td>和平精英</td>
                    <td>7</td>
                    <td align="center"><input type="checkbox" name="sp" value="和平精英">
                    </td>
                </tr>
                <tr>
                    <td>元气森林</td>
                    <td>7</td>
                    <td align="center"><input type="checkbox" name="sp" value="元气森林">
                    </td>
                </tr>
                <tr>
                    <td>可乐</td>
                    <td>7</td>
                    <td align="center"><input type="checkbox" name="sp" value="可乐">
                    </td>
                </tr>
                <tr>
                    <td>雪碧</td>
                    <td>7</td>
                    <td align="center"><input type="checkbox" name="sp" value="雪碧">
                    </td>
                </tr>
                <tr>
                    <td>冰红茶</td>
                    <td>7</td>
                    <td align="center"><input type="checkbox" name="sp" value="冰红茶">
                    </td>
                </tr>
                <tr>
                    <td colspan="3"><input type="submit" value="加购">
                    </td>
                </tr>
            </tbody>
        </table>
    </form>
</body>
</html>

  MyJsp.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<html>
  <head>
    <title>My JSP 'index.jsp' starting page</title>
  </head>
  <body>
    <%
        session.invalidate();
        response.sendRedirect("index.jsp");
    %>
</body>
</html>

  E.jsp

<%@ 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>
  <%
        request.setCharacterEncoding("utf-8");
        String[] sp = request.getParameterValues("sp");
        for (int i = 0; sp != null && i < sp.length; i++) {
            out.print(sp[i] + "<br>");
        }
    %>
</body>
</html>

 

 

 

 

 

 

 

posted @ 2022-04-24 17:25  兰佳淇  阅读(9)  评论(0编辑  收藏  举报