1.session
1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<% 9 ????????????//获取session ID ?Manager 可以将session保存在本地上10 ????????????String id = session.getId(); ??????11 ????????%>12 ????????<h1><%=id %></h1>13 ????</body>14 </html>
1 <%@ page language="java" contentType="text/html" 2 ????pageEncoding="GBK"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <title>Insert title here</title> 7 </head> 8 <body> 9 ????<%10 ????????if(session.isNew()){11 ????%>12 ????????<h1>欢迎新用户</h1>13 ????<% ???????????14 ????????}else{15 ????%>16 ????????????<h1>老用户</h1>17 ????????<% ???????????????????18 ????????} ???????19 ????%>20 </body>21 </html>1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<% 9 ????????????long start = session.getCreationTime(); //创建此会话的时间10 ????????????long end = session.getLastAccessedTime();//客户端上一次发送与此会话关联的请求的时间，最后一次操作此会话时间11 ????????????long time = (end-start)/1000; ?// 毫秒转换为秒12 ????????%>13 ????????<h1>您已经在此网页停留了<%=time %>秒</h1>14 ????</body>15 </html>
2.request
1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<% 9 ????????????Cookie c1 = new Cookie("hw","hello world");10 ????????????Cookie c2 = new Cookie("hi","nice to meet you");11 ????????????c1.setMaxAge(300);//设置最大生存时间300秒12 ????????????c2.setMaxAge(30); //设置最大生存时间30秒13 ????????????response.addCookie(c1);14 ????????????response.addCookie(c2); ???????????15 ????????%>16 ????</body>17 </html> 1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<% 9 ????????????Cookie [] c = request.getCookies();10 ????????????if(c!=null){11 ????????????????for(int i=0;i<c.length;i++){12 ????????%>13 ????????????????<h1>name:<%=c[i].getName() %>--value:<%=c[i].getValue() %></h1> ???????14 ????????<% ????????????15 ????????????????} ???????????????16 ????????????} ???????????17 ????????%>18 ????</body>19 </html>3.定时刷新
1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<%! 9 ????????????int count = 0; 10 ????????%>11 ????????<%12 ????????????response.setHeader("refresh","1"); //每隔1秒刷新一次13 ????????%>14 ????????<h3>已经刷新了<%=count++ %>次</h3>15 ????</body>16 </html>4.定时跳转页面一
1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<h1>访问错误，5秒后跳转至首页，如果没有跳转，请点击<a href=hello.jsp>这里</a></h1> 9 ????????<%!10 ????????????int count = 0; 11 ????????%>12 ????????<%13 ????????????response.setHeader("refresh","5; url=hello.jsp");14 ????????%>15 ????</body>16 </html>4.定时跳转页面二
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta http-equiv="refresh" content="5;url=hello.jsp" charset="utf-8"> 5 <title>Insert title here</title> 6 </head> 7 <body> 8 ????<h1>访问错误，5秒后跳转至首页，如果没有跳转，请点击<a href=hello.jsp>这里</a></h1> 9 </body>10 </html>
5.重定向
1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<% 9 ????????????response.sendRedirect("hello.jsp");10 ?????????%>11 ????</body>12 </html>6.addcookie
1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<% 9 ????????????Cookie c1 = new Cookie("hw","hello world");10 ????????????Cookie c2 = new Cookie("hi","nice to meet you");11 ????????????c1.setMaxAge(300);//设置最大生存时间300秒12 ????????????c2.setMaxAge(30); //设置最大生存时间30秒13 ????????????response.addCookie(c1);14 ????????????response.addCookie(c2); ???????????15 ????????%>16 ????</body>17 </html>
1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<% 9 ????????????Cookie [] c = request.getCookies();10 ????????????if(c!=null){11 ????????????????for(int i=0;i<c.length;i++){12 ????????%>13 ????????????????<h1>name:<%=c[i].getName() %>--value:<%=c[i].getValue() %></h1> ???????14 ????????<% ????????????15 ????????????????} ???????????????16 ????????????} ???????????17 ????????%>18 ????</body>19 </html>7.练习
1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<form action="login.jsp" method="post"> 9 ????????????用户名:<input type="text" name="uname" ><br/>10 ????????????密 ???码:<input type="password" name="upass" ><br/>11 ????????????<input type="submit" value="登陆">12 ????????????<input type="reset" value="清空">13 ????????</form>14 ????????<%15 ????????????//用户名scott，密码orcl16 ????????????String name=request.getParameter("uname");17 ????????????String password=request.getParameter("upass");18 ????????????19 ????????if(!(name==null||"".equals(name.trim())||password==null||"".equals(password.trim()))){20 ????????????if("scott".equals(name)&&"orcl".equals(password)){21 ????????????????response.setHeader("refresh","2;url=welcome.jsp");//2秒后跳转welcome页面22 ????????????????session.setAttribute("userName",name); //传值23 ????????%>24 ????????????????<h1>登陆成功，两秒后跳转至欢迎页 </h1>25 ????????????????<h1>如果没有跳转，请点击<a href="welcome.jsp">这里</a></h1>26 ????????<% 27 ????????????}else{28 ????????%>29 ????????????????<h3>用户名或密码错误，请重新登陆...</h3>30 ????????<% 31 ????????????????response.setHeader("refresh","2;url=login.jsp");32 ????????????}33 ????????}else{ ???????????34 ????????}35 ????????%> ???????36 ????</body>37 </html> 1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<% 9 ????????????session.invalidate();10 ????????????response.setHeader("refresh","2;login.jsp");11 ????????%>12 ????????<h2>注销成功，两秒后跳转至首页</h2>13 ????????<h1>如果没有跳转，请点击<a href="login.jsp">这里</a></h1>14 ????</body>15 </html> 1 <%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 ????<head> 5 ????????<title>Insert title here</title> 6 ????</head> 7 ????<body> 8 ????????<% ?9 ????????if(session.getAttribute("userName")!=null){ ???10 ????????%> ???????????????????11 ????????????<h2>欢迎<%=session.getAttribute("userName") %>登陆本系统</h2>12 ????????????<h1>注销请点击<a href="loginout.jsp">注销</a></h1>13 ????????<% ???14 ????????}else{15 ????????%>16 ????????????<h1>请先<a href="login.jsp">登录</a></h1>17 ????????<% ???18 ????????}19 ????????%>20 ????</body>21 </html>JSP中四种属性保存范围(2)
原文地址：http://www.cnblogs.com/liuyangv/p/8067718.html