精品熟女碰碰人人a久久,多姿,欧美欧美a v日韩中文字幕,日本福利片秋霞国产午夜,欧美成人禁片在线观看

jsp實現(xiàn)用戶自動登錄功能

理解并掌握cookie的作用以及利用cookie實現(xiàn)用戶的自動登錄功能，實現(xiàn)下圖效果

當服務(wù)器判斷出該用戶是首次登錄的時候，會自動跳轉(zhuǎn)到登錄界面等待用戶登錄，并填入相關(guān)信息。通過設(shè)置cookie的有效期限來保存用戶的信息，關(guān)閉瀏覽器后，驗證是否能夠自動登錄，若能登錄，則打印歡迎信息；否則跳轉(zhuǎn)到登錄頁面。

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("只能選擇一個選項");
   return false;
  }
  
  }; 
  
 };
 
 </script>
 </head>
 
 <body>
 <!-- 設(shè)置html頁面 -->
 <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("當前\""+val+"\"用戶可自動登錄");
 %>

 </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頁面讀取
 session.setattribute("name", name);
 //設(shè)置cookie
 cookie cookie = new cookie("name",name);
 //根據(jù)提交選項設(shè)置cookie保存時間
 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，2秒后轉(zhuǎn)到注冊界面！");
 response.setheader("refresh","2;url=login.jsp");
 %>
 如果沒有自動跳轉(zhuǎn)，請點擊<a href="login.jsp" rel="external nofollow" >此處</a>進行跳轉(zhuǎn)
 <%
 //response.sendredirect("login.jsp");
 }
%>
 
 </body>
</html>

實現(xiàn)效果：

1.

2.

3.

4.

5.

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持碩編程。

相關(guān)文章