第八周jsp
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" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<form action="Interface.jsp" method="post" name="eight">
请输入账号：<input name="name" type="text"/><br/>
请输入密码：<input name="password" type="password"/><br/>
<input type="button" value="登录" onclick="denglu()"/>
<script type="text/javascript">
function denglu(){
if(eight.name.value==""){
alert("账号不能为空！");
return;
}
if(eight.password.value==""){
alert("密码不能为空！");
return;
}
eight.submit();
}
</script>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</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("logo.jsp")
.forward(request, response);
} else {
request.getRequestDispatcher("no.jsp").forward(request,
response);
}
%>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>登录成功</title>
</head>
<body>
<%
String name = (String) session.getAttribute("name");
if (name == null) {
response.sendRedirect("Interface1.jsp");
}
%>
欢迎你<%=name%><br>
<br>
<form action="exit.jsp">
<input type="submit" value="退出登录">
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
登录失败
</body>
</html>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>退出界面</title>
</head>
<body>
<%
session.invalidate();
response.setHeader("refresh", "0;url=Interface.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" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<form action="eight05..jsp" method="post">
衣服         价格：50
<input type="checkbox" value="衣服" name="sg" />加入购物车<br />
鞋子       价格：20
<input type="checkbox" value="鞋子" name="sg"/>加入购物车<br />
帽子    价格：5.5
<input type="checkbox" value="帽子" name="sg" />加入购物车<br />
<input type="submit" value="购买"/>
</form>
</script>
<form action="1.1.jsp" method="post" >
<input type="submit" value="退出登录" />
</form>
</body> </body> </html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String itemName[]=request.getParameterValues("gwc");
if(itemName==null){
out.print("未添加购物车");
}else{
out.print("您购买的商品为："+"<br/>");
for(int i=0;i<itemName.length;i++){
out.print("("+(i+1)+")"+itemName[i]+"<br>");
}
}
%>
<a href="eight05.jsp">返回</a>
</body>
</html>
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