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"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>登录界面 index.jsp</title>
</head>
<body>
<form action="pan.jsp" name="form1">
用户名：<input type="text" name="name"><br> <br> 密码：<input
type="password" value="12345" name="password"><br> <br>
<input type="button" value="登录" name="d" onclick="fu()">
</form>
<script type="text/javascript">
function fu() {
if (form1.name.value == "") {
alert("账号不能为空");
return;
}
if (form1.password.value == "") {
alert("密码不能为空");
return;
}
form1.submit();
}
</script>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>界面pan.jsp</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String name = request.getParameter("name");
String password = request.getParameter("password");
if (name.equals(password)) {
session.setAttribute("name", name);
request.getRequestDispatcher("y.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>登录成功界面y.jsp</title>
</head>
<body>
<%
String name = (String) session.getAttribute("name");
if (name == null) {
response.sendRedirect("index.jsp");
}
%>
欢迎你<%=name%><br>
<br>
<form action="tui.jsp">
<input type="submit" value="退出登录">
</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>登录失败界面no.jsp</title> </head> <body>登录失败！ </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>退出界面tui.jsp</title>
</head>
<body>
<%
session.invalidate();
response.setHeader("refresh", "0;url=index.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"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>主界面y.jsp</title>
</head>
<body>
<%
String name = (String) session.getAttribute("name");
if (name == null) {
response.sendRedirect("index.jsp");
}
%>
欢迎你<%=name%><br>
<br>
<form action="buy.jsp" method="post">
杯子 30元 <input type="checkbox" value="杯子 30元" name="buy">加入购物车<br><br>
眼影 99元 <input type="checkbox" value="眼影 99元" name="buy">加入购物车<br><br>
相册 50元 <input type="checkbox" value="相册 50元" name="buy">加入购物车<br><br>
<input type="submit" value="查看购物车">
</form>
<form action="tui.jsp">
<input type="submit" value="退出登录">
</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>购物车界面buy.jsp</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String buy[] = request.getParameterValues("buy");
if (buy == null) {
out.print("购物车为空");
} else {
out.print("购买的商品为" + "<br/>");
for (int i = 0; i < buy.length; i++) {
out.print("(" + (i + 1) + ")" + buy[i] + "<br/>");
}
}
%>
<a href="y.jsp">返回</a>
</body>
</html>
