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。
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"%>
<html>
<head>
<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("1.login.jsp");
%>
<a href="1.out.jsp">退出登录</a> <br>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title></title>
<script type="text/javascript">
function v() {
if (loginForm.uname.value=="") {
alert("账号不能为空！");
return;
}
if (loginForm.password.value=="") {
alert("密码不能为空！");
return;
}
loginForm.submit();
}
</script>
</head>
<body>
<form name="loginForm" action="1.oblogin.jsp" method="post">
账号：<input type="text" name="uname"><br>
密码：<input type="password" name="password"> <br>
<input type="submit" value="登录" onclick="v()">
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title></title> </head> <body> 登陆失败，请重试！ <% response.setHeader("refresh", "5;url=1.login.jsp"); %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title></title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String uname = request.getParameter("uname");
String password = request.getParameter("password");
if (uname.equals(password)) {
session.setAttribute("uname", uname);
request.getRequestDispatcher("1.main.jsp").forward(request, response);
} else {
response.sendRedirect("1.false.jsp");
}
%>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title></title>
</head>
<body>
<%
session.invalidate();
response.setHeader("refresh", "5;url=1.login.jsp");
%>
退出成功!
</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"%>
<html>
<head>
<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("1.login.jsp");
%>
<a href="1.out.jsp">退出登录</a> <br>
<h2>欢迎进入家电频道</h2>
<form action="2.show.jsp">
<hr>
是否加入购物车？<br>
<input name="item" type="checkbox" value="Haier refrigerator">
海尔电冰箱 $1000<br>
<input name="item" type="checkbox" value="Samsung TV">
三星电视 $2000<br>
<input name="item" type="checkbox" value="Midea air conditioning">
美的空调 $319<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></title>
<script type="text/javascript">
function v() {
if (loginForm.uname.value=="") {
alert("账号不能为空！");
return;
}
if (loginForm.password.value=="") {
alert("密码不能为空！");
return;
}
loginForm.submit();
}
</script>
</head>
<body>
<form name="loginForm" action="1.oblogin.jsp" method="post">
账号：<input type="text" name="uname"><br>
密码：<input type="password" name="password"> <br>
<input type="submit" value="登录" onclick="v()">
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title></title> </head> <body> 登陆失败，请重试！ <% response.setHeader("refresh", "5;url=1.login.jsp"); %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title></title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String uname = request.getParameter("uname");
String password = request.getParameter("password");
if (uname.equals(password)) {
session.setAttribute("uname", uname);
request.getRequestDispatcher("1.main.jsp").forward(request, response);
} else {
response.sendRedirect("1.false.jsp");
}
%>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title></title>
</head>
<body>
<%
session.invalidate();
response.setHeader("refresh", "5;url=1.login.jsp");
%>
退出成功!
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title></title>
</head>
<body>
<h2>购物车</h2>
<%
request.setCharacterEncoding("utf-8");
String itemName[]=request.getParameterValues("item");
if(itemName==null){
out.print("购物车为空");
}
else{
for(int k=0;k<itemName.length;k++){
out.print("("+(k+1)+")"+itemName[k]+"<br>");
}
}
%>
</body>
</html>
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