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jsp實(shí)現(xiàn)用戶自動(dòng)登錄功能
瀏覽：2日期：2022-06-07 13:25:37
理解并掌握Cookie的作用以及利用cookie實(shí)現(xiàn)用戶的自動(dòng)登錄功能，實(shí)現(xiàn)下圖效果
當(dāng)服務(wù)器判斷出該用戶是首次登錄的時(shí)候，會(huì)自動(dòng)跳轉(zhuǎn)到登錄界面等待用戶登錄，并填入相關(guān)信息。通過(guò)設(shè)置Cookie的有效期限來(lái)保存用戶的信息，關(guān)閉瀏覽器后，驗(yàn)證是否能夠自動(dòng)登錄，若能登錄，則打印歡迎信息；否則跳轉(zhuǎn)到登錄頁(yè)面。
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%request.setCharacterEncoding("GB2312"); %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" > <title>My JSP "login.jsp" starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" > --> <script type="text/javascript"> window.onload = function(){ //獲取submit var submit = document.getElementById("submit"); var name = document.getElementById("name"); //為submit綁定單擊響應(yīng)函數(shù) submit.onclick = function(){ times = document.getElementsByName("time"); var count=0; for(var i=0;i<times.length;i++){ if(times[i].checked == true){ count++; } } if(count>=2){ alert("只能選擇一個(gè)選項(xiàng)"); return false; } }; }; </script> </head> <body> <!-- 設(shè)置html頁(yè)面 --> <form action="sucess.jsp" method="post"> 用戶名：<input name="username" /><br/> <input type="checkbox" name="time" value="notSave" />不保存 <input type="checkbox" name="time" value="aDay" />一天 <input type="checkbox" name="time" value="aWeek" />一周 <input type="checkbox" name="time" value="forever" />永久 <br/><br/> <input type="submit" name="submit" id="submit" value="登錄"/> </form> <% //讀取session值 String val= (String)session.getAttribute("name"); //如果session不存在 if(val==null){ val ="不存在"; } out.print("當(dāng)前\""+val+"\"用戶可自動(dòng)登錄"); %> </body></html>sucess.jsp
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" > <title>My JSP "show.jsp" starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" > --> </head> <body> <% //獲取username String name = request.getParameter("username"); //判斷用戶名是否存在 if(name != null && !name.trim().equals("")){ String[] time = request.getParameterValues("time"); //設(shè)置session值，便于login頁(yè)面讀取 session.setAttribute("name", name); //設(shè)置Cookie Cookie Cookie = new Cookie("name",name); //根據(jù)提交選項(xiàng)設(shè)置cookie保存時(shí)間 if(time != null){ for(int i=0;i<time.length;i++){ //不保存Cookie if(time[i].equals("notSave")){ Cookie.setMaxAge(0); } //保存一天Cookie if(time[i].equals("aDay")){ Cookie.setMaxAge(60*60*24); } //保存一周Cookie if(time[i].equals("aWeek")){ Cookie.setMaxAge(60*60*24*7); } //永久保存Cookie，設(shè)置為100年 if(time[i].equals("forever")){ Cookie.setMaxAge(60*60*24*365*100); } } } //在客戶端保存Cookie response.addCookie(Cookie); } else{%> <%--用戶名不存在則進(jìn)行判斷是否已有cookie --%> <% //獲取cookie Cookie[] cookies = request.getCookies(); //cookie存在 if(cookies != null && cookies.length > 0){ for(Cookie cookie:cookies){ //獲取cookie的名字 String cookieName = cookie.getName(); //判斷是否與name相等 if(cookieName.equals("name")){ //獲取cookie的值 String value = cookie.getValue(); name = value; } } } } if(name != null && !name.trim().equals("")){ out.print("您好: " + name+"歡迎登錄"); } else{//否則重定向到登錄界面 out.print("您還沒有注冊(cè)，2秒后轉(zhuǎn)到注冊(cè)界面！"); response.setHeader("refresh","2;url=login.jsp"); %> 如果沒有自動(dòng)跳轉(zhuǎn)，請(qǐng)點(diǎn)擊<a href="login.jsp" rel="external nofollow" >此處</a>進(jìn)行跳轉(zhuǎn) <% //response.sendRedirect("login.jsp"); }%> </body></html>實(shí)現(xiàn)效果：
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標(biāo)簽：
JSP
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