jsp1
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head><meta charset="UTF-8"><title>session测试</title>
</head><body><form method="post" name="form"><table><tr><td>用户名：<input type="text" name="user"></td></tr></table>
</form><%String user=request.getParameter("user");session.setAttribute("user",user);
%>
</body>
</html>jsp2
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" import="java.lang.Math"%><!DOCTYPE html>
<html>
<head><meta charset="UTF-8"><title>admin</title>
</head>
<body>
<form method="post" name="form"><table><tr><td>物品名称：<input type="text" name="user"></td></tr></table>
<%String user=request.getParameter("user");session.setAttribute("name",user);
%>
</form>
</body>
</html>jsp3
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" import="java.lang.Math"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>static</title>
</head>
<body>
<form method="post" name="form"><table><tr><td><input type="submit" name="submit" value="下单"></td></tr></table>用户名：<%=session.getAttribute("user") %><br>
商品名称：<%=session.getAttribute("name") %>
</body>
</html>
三个页面为独立的页面，彼此不传递数据
1和2都将数据存储到session中
3读取session中的数据
运行截图
1
2
3
