<%@ 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>session1.jsp</title> </head> <body> <% String cardid = null ; Cookie[] cks = request.getCookies() ; if(cks != null) { // 如果已经设置了cookie ， 则得到它的值，并保存到变量pName中 for(int i=0; i<cks.length; i++) { if(cks[i].getName().equals("cardid")) cardid = cks[i].getValue(); } } %> <form action="session2.jsp" method="post"> 卡号<input type="text" name="cardid" value="<% if(cardid != null) out.println(cardid); %>"><br> 密码<input type="password" name="password"><br> <input type="submit" value="提交"> </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>session2.jsp</title> </head> <body> <%@page import="java.net.URLEncoder"%> <%@page import="com.shuyinghengxie.bank.CardDAO"%> <%@ page language="java" contentType="text/html; charset=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> <% //设置不缓存页面 response.setHeader("Cache-Control", "no-cache") ; //登陆成功定时跳转 //response.setHeader("refresh", "2;URL=http://www.baidu.com") ; //页面跳转 //response.sendRedirect("success.jsp") ; String kahao = request.getParameter("cardid") ; String password = request.getParameter("password") ; if(kahao==null || password==null || kahao == "" || password == "" ) { out.write("请正确登录") ; } else { CardDAO cd = new CardDAO() ; if(cd.checkLogin(kahao, password)) { //out.write("登陆成功") ; response.getWriter().write("验证通过") ; //创建Cookie Cookie ck = new Cookie("kah888o",kahao) ; //设置过期时间 ck.setMaxAge(10*24*60*60) ; //发送 response.addCookie(ck) ; //创建session session.setAttribute("kahao", kahao) ; session.setAttribute("username","李四") ; //设置session超时时间 //默认设置是20分钟 //如果超过20分钟没有任何请求发送给服务器，session就失效 session.setMaxInactiveInterval(30) ; response.sendRedirect("session3.jsp") ; } else { out.write("登录失败") ; } } %> </body> </html> </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>session3.jsp</title> </head> <body> <% Object kahao = session.getAttribute("kahao") ; if(kahao != null) { out.write("您已登陆") ; } else { out.write("尚未登陆") ; } %> <a href="session4.jsp">退出登录</a> </body> </html>
<%@ page language="java" contentType="text/html; charset=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>session4.jsp</title> </head> <body> 已退出！ <% session.invalidate() ; //销毁session //2秒后跳转 response.setHeader("refresh","2 ; url= session3.jsp") ; %> </body> </html>
这时点击退出，跳到session4页面，此页面定时2秒跳转session3
这是可以看到已退出登陆
