作业4.21
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。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<form action="lose.jsp" name="fm">
用户名：<input type="text" name="uname" />
密码：<input type="password" name="mima" />
<input type="submit" value="登录" />
</form>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'lose.jsp' starting page</title>
</head>
<body>
<%
String uname=request.getParameter("uname");
String pas=request.getParameter("pas");
if(uname.equals(pas)){
session.setAttribute("uname", uname);
request.getRequestDispatcher("regist.jsp").forward(request, response);
}
else{
response.sendRedirect("trium.jsp");
}
%>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<%
String uname=(String)session.getAttribute("uname");
if(uname==null)
response.sendRedirect("index.jsp");
%>
欢迎你<%=uname %>
<a href="car.jsp">退出登录</a>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'trium.jsp' starting page</title>
</head>
<html>
<body>
<%
session.invalidate();
response.sendRedirect("index.jsp");
%>
</body>
</html>
<!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=index.jsp");
%>
退出成功！
</body>
</html>
</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）
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<head>
</head>
<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>
<body>
<form name="loginForm" action="lose.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>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'lose.jsp' starting page</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("car.jsp").forward(request, response);
} else {
response.sendRedirect("trium.jsp");
}
%>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</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("index.jsp");
%>
<h3>水果商店</h3>
<form action="c1.jsp">
<hr>
是否加入购物车？<br>
<input name="item" type="checkbox" value="apple">
apple 3 <br>
<input name="item" type="checkbox" value="banana">
banana 2<br>
<input name="item" type="checkbox" value="grape">
grape 9<br>
<input name="item" type="checkbox" value="orange">
orange 4 <br>
<input name="item" type="checkbox" value="strawberry">
strawberry 10 <br>
<hr>
<input type="submit" value="加入购物车">
</form>
<a href="regist.jsp">退出登录</a> <br>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
购物车:<br>
<%
request.setCharacterEncoding("utf-8");
String itemName[]=request.getParameterValues("item");
if(itemName==null){
out.print("购物车空空如也");
}
else{
for(int l=0;l<itemName.length;l++){
out.print("("+(l+1)+")"+itemName[l]+"<br>");
}
}
%>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
session.invalidate();
response.setHeader("refresh", "5;url=index.jsp");
%>
退出成功!
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<%String src=request.getParameter("id"); %>
<body>
登陆失败，请重试
<%
response.setHeader("refresh", "5;url=index.jsp");
%>
</body>
</html>
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