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JSP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。 

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" 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>

	<script type="text/javascript">
		function login() {
			if (formtext.caccount.value == "") {
				alert("账号不能为空!");
				return;
			}
			if (formtext.cpassword.value == "") {
				alert("密码不能为空!");
				return;
			}
			formtext.submit();
		}
	</script>

	<form name="formtext" action="dologin.jsp" method="post">
		<b>账号</b> <input type="text" name="caccount" /> <br> <b>密码</b> <input
			type="password" name="cpassword" /> <br> <input type="button"
			onclick="login()" value="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>
	<%
		String uname = request.getParameter("caccount");
		String upwd = request.getParameter("cpassword");
		if (uname.equals(upwd)) {
			session.setAttribute("uname", uname);
			request.getRequestDispatcher("main.jsp").forward(request, response);
		} else {

			response.sendRedirect("login.jsp");
		}
	%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
	pageEncoding="utf-8"%>
<%@ page import="po.Commodity"%>
<%@ page import="java.util.List"%>
<%@ page import="java.util.ArrayList"%>
<!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>
	<%
		String uname = (String) session.getAttribute("uname");
		if (uname == null)
			response.sendRedirect("login.jsp");
	%>
	<form action="logout.jsp" method="post">
		&nbsp&nbsp&nbsp&nbsp&nbsp<input type="submit" value="退出">
	</form>
	<br>
	<form action="shopping.jsp" method="post">
		&nbsp&nbsp&nbsp&nbsp&nbsp<input type="submit" value="显示购物车">
	</form>
	<h3>&nbsp&nbsp&nbsp&nbsp&nbsp商品展示</h3>

	<ul>
		<form action="add.jsp">
			<input type="hidden" name="cname" value="水浒传"> <input
				type="hidden" name="cprice" value="55">
			<li>商品名：水浒传&nbsp价格：55&nbsp<input type="submit" value="加入购物车"></li>

		</form>
		<form action="add.jsp">
			<input type="hidden" name="cname" value="三国志"> <input
				type="hidden" name="cprice" value="45">
			<li>商品名：三国志&nbsp价格：45&nbsp<input type="submit" value="加入购物车"></li>

		</form>
		<form action="add.jsp">
			<input type="hidden" name="cname" value="西游记"> <input
				type="hidden" name="cprice" value="35">
			<li>商品名：西游记&nbsp价格：35&nbsp<input type="submit" value="加入购物车"></li>

		</form>
	</ul>


</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>
	<%
		session.invalidate();
		response.setHeader("refresh", "1;url=login.jsp");
	%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
	pageEncoding="utf-8"%>
<%@ page import="po.Commodity"%>
<%@ page import="java.util.List"%>
<!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>

	<ul>
		<%
			List<Commodity> slist = (List<Commodity>) session.getAttribute("slist");
			System.out.print("123");
			System.out.print(slist.isEmpty());
			System.out.print(slist == null);
			for (Commodity c : slist) {
				String cname = c.getCname();
				double cprice = c.getCprice();
				out.print("<form action='remove.jsp'>");
				out.print("<input type='hidden' name='cname' value='" + cname + "'>");
				out.print("<input type='hidden' name='cprice' value='" + cprice + "'>");
				out.print("<li>商品名：" + cname + "&nbsp价格：" + cprice + "&nbsp<input type='submit' value='删除'></li>");
				out.print("</form>");
				System.out.print("123");
			}
		%>
	</ul>

</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
	pageEncoding="utf-8"%>
<%@ page import="java.util.List"%>
<%@ page import="po.Commodity"%>
<!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>
	<%!public Commodity search(List<Commodity> slist, String cname) {
		for (Commodity c : slist) {
			if (c.getCname().equals(cname)) {
				return c;
			}
		}
		return null;
	}%>
	<%
		String cname = request.getParameter("cname");
		double cprice = Double.parseDouble(request.getParameter("cprice"));

		List<Commodity> slist = (List<Commodity>) session.getAttribute("slist");
		slist.remove(search(slist, cname));
		request.getRequestDispatcher("shopping.jsp").forward(request, response);
	%>

</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
	pageEncoding="utf-8"%>
<%@ page import="po.Commodity"%>
<%@ page import="java.util.List"%>
<%@ page import="java.util.ArrayList"%>
<!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>
	<%
		List<Commodity> slist = (List<Commodity>) session.getAttribute("slist");
		if (slist == null) {
			slist = new ArrayList<>();
			session.setAttribute("slist", slist);
		}
		String cname = request.getParameter("cname");
		double cprice = Double.parseDouble(request.getParameter("cprice"));
		Commodity c = new Commodity();
		c.setCname(cname);
		c.setCprice(cprice);

		slist.add(c);
		//session.setAttribute("slist", slist);
		request.getRequestDispatcher("main.jsp").forward(request, response);
	%>
</body>
</html>

 

posted @ 2022-04-20 23:35  Y6  阅读(58)  评论(0)  编辑  收藏  举报