<%@ 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) { // 如果已經設置了cookie ， 則得到它的值，並保存到變量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"> 卡號<input type="text" name="cardid" value="<% if(cardid != null) out.println(cardid); %>"><br> 密碼<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> <% //設置不緩存頁面 response.setHeader("Cache-Control", "no-cache") ; //登陸成功定時跳轉 //response.setHeader("refresh", "2;URL=http://www.baidu.com") ; //頁面跳轉 //response.sendRedirect("success.jsp") ; String kahao = request.getParameter("cardid") ; String password = request.getParameter("password") ; if(kahao==null || password==null || kahao == "" || password == "" ) { out.write("請正確登錄") ; } else { CardDAO cd = new CardDAO() ; if(cd.checkLogin(kahao, password)) { //out.write("登陸成功") ; response.getWriter().write("驗證通過") ; //創建Cookie Cookie ck = new Cookie("kah888o",kahao) ; //設置過期時間 ck.setMaxAge(10*24*60*60) ; //發送 response.addCookie(ck) ; //創建session session.setAttribute("kahao", kahao) ; session.setAttribute("username","李四") ; //設置session超時時間 //默認設置是20分鍾 //如果超過20分鍾沒有任何請求發送給服務器，session就失效 session.setMaxInactiveInterval(30) ; response.sendRedirect("session3.jsp") ; } else { out.write("登錄失敗") ; } } %> </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("您已登陸") ; } else { out.write("尚未登陸") ; } %> <a href="session4.jsp">退出登錄</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() ; //銷毀session //2秒后跳轉 response.setHeader("refresh","2 ; url= session3.jsp") ; %> </body> </html>
這時點擊退出，跳到session4頁面，此頁面定時2秒跳轉session3
這是可以看到已退出登陸
