cookie實現記住登陸名和密碼

時間 2019-11-09

標籤 cookie 實現記住登陸密碼欄目 HTML 简体版

原文原文鏈接

在最近學習的session做用域中，順便了解了一下cookie,javascript

session是存放在服務器中，而cookie是存放在客戶端中。css

本篇文章主要是使用cookie來實現記住密碼的功能。html

簡單的login.jsp頁面的代碼： java

在這裏解釋一下第二行的s標籤，我是使用struts2框架作的。就簡單的servelet和jsp能夠實現一樣的功能,jquery

既然能夠記住密碼，相應的就是密碼安全問題。在這裏順便說一下MD5加密。值須要一個md5.js就能夠sql

  1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
  2 <%@ taglib prefix="s" uri="/struts-tags" %>
  3 
  4 <%
  5 String path = request.getContextPath();
  6 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
  7 %>
  8 
  9 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 10 <html>
 11   <head>
 12     <base href="<%=basePath%>">
 13     
 14     <title>My JSP 'login.jsp' starting page</title>
 15     
 16     <meta http-equiv="pragma" content="no-cache">
 17     <meta http-equiv="cache-control" content="no-cache">
 18     <meta http-equiv="expires" content="0">    
 19     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 20     <meta http-equiv="description" content="This is my page">
 21     <!--
 22     <link rel="stylesheet" type="text/css" href="styles.css">
 23     -->
 24         <link rel="stylesheet" href="css/style_public.css" />
 25         <link rel="stylesheet" href="css/style_login.css" />
 26   <script type="text/javascript" src="js/jquery-1.8.3.js"></script>
　　　　<script src="js/md5.js" ></script>
 27   </head>
 28   
 29 <body>
 30         ta<!--頭部-->
 31         <header>
 32             <div class="btn"><a href="login.html">登錄</a>/<a href="registered.html">註冊</a></div>
 33         </header>
 34         <!--中間內容（主題內容）-->
 35         <div class="main">
 36             <div class="box">
 37                 <p><a href="index.html">返回首頁</a></p>
 38                 <form id="forml" action="user_valid.action" method="post">
 39                 <s:token></s:token>
 40                 <div class="content">
 41                     <p>QQ號</p>
 42                     <input type="text" placeholder="請輸入QQ號" id="input1" name="um.userid" />
 43                     <p>密碼</p>
 44                     <input type="password" placeholder="請輸入密碼" id="input2" name="um.userpwd" onblur="getmd5()"/>
 45                     <div style="margin-top: 20px;color:red;" ><input id="remebers" type="checkbox"  name="remenber" value="1"/>
 46           <span >記住用戶名和密碼</span></div>
 47                     <div class="btnss" onclick="sub()">登陸</div>
 48                 </div>
 49                 </form> 
 50                 <span id="sp1"></span>
 51                 <span id="sp2"></span>
 52             </div>
 53             
 54         </div>
 55         <!--尾部-->
 56         <footer>
 57             <p style="margin-top: 0px;">網站連接:你猜網 www.xxxxxxxxx.com</p>
 58         </footer>
 59         <script>
 60 $(document).ready(function () {
 61        $("#input1").focus();
 62        //記住用戶名和密碼
 63        $('#remebers').click(function () {
 64         if ($("#input1").val() == "") {
 65          alert("用戶名不能爲空！");
 66         }
 67         if($("#input2").val() == "")
 68         {
 69          alert("密碼不能爲空！");
 70         } else {
 71              if ($('#remebers').attr("checked")) {
 72                       setCookie("userid", $("#input1").val(), 60);
 73                           setCookie("upwd", $("#input2").val(), 60);
 74              }else {
 75                       delCookie("userid");
 76                       delCookie("upwd");
 77              }
 78         }
 79        });
 80        if (getCookie("userid") != null)
 81        {
 82         $('#remebers').attr("checked", "checked");
 83         $('#input1').val(getCookie("userid"));
 84         $('#input2').val(getCookie("upwd"));
 85        }
 86       })
 87       //寫cookies
 88       function setCookie(name, value) {
 89        var Days = 30;
 90        var exp = new Date();
 91        exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
 92        document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
 93       }
 94       //讀取cookies 
 95       function getCookie(name) {
 96        var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
 97        if (arr = document.cookie.match(reg)) return unescape(arr[2]);
 98        else return null;
 99       }
100       //刪除cookies 
101       function delCookie(name) {
102        var exp = new Date();
103        exp.setTime(exp.getTime() - 1);
104        var cval = getCookie(name);
105        if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
106       }
107         
108         
109         
110         function sub(){
111           document.getElementById("forml").submit();
112         }
113         
114             window.onload=function(){
115                 var input1=document.getElementById("input1");
116                 var input2=document.getElementById("input2");
117                 var sp1=document.getElementById("sp1");
118                 var sp2=document.getElementById("sp2");
119                 //失去焦點時判斷    QQ號
120                 input1.onblur=function(){
121                     if(sp1.innerText==""||sp1.innerText==null||sp1.innerText==undefined){
122                         sp1.innerText="請輸入您的QQ號";
123                     }
124                 }
125                 //失去焦點時判斷密碼
126                 input2.onblur=function(){
127                     if(sp2.innerText==""||sp2.innerText==null||sp2.innerText==undefined){
128                         sp2.innerText="請輸入您的密碼";
129                     }
130                 }
131             }

　　//將密碼生成md5，密碼輸完失去焦點時調用
　　function getmd5(){
　　　　var a= hex_md5($("#input2").val())apache

　　　　$("#input2").val(a);安全

　　}服務器

132         </script>
133     </body>
134 </html>

頁面佈局差很少了，那就是後臺，分別得到input中的三個值，登陸id和密碼還有是否記住密碼的選框

 1 package com.direct.action;
 2 
 3 import java.sql.Connection;
 4 import java.sql.PreparedStatement;
 5 import java.sql.ResultSet;
 6 import java.sql.SQLException;
 7 import java.util.ArrayList;
 8 
 9 import javax.servlet.http.Cookie;
10 import javax.servlet.http.HttpServletRequest;
11 import javax.servlet.http.HttpServletResponse;
12 
13 import org.apache.struts2.ServletActionContext;
14 
15 import com.direct.dao.LoginDao;
16 import com.direct.model.UserModel;
17 import com.direct.util.Dutil;
18 import com.opensymphony.xwork2.ActionContext;
19 import com.opensymphony.xwork2.ActionSupport;
20 
21 public class Login extends ActionSupport{
22 
23     private UserModel um;
24     private int remenber;
25     
26     public String valid(){
27         LoginDao dao = new LoginDao();
28         ArrayList<UserModel> listum = dao.vali(um.getUserid(), um.getUserpwd());
29         if (listum.size()>0) {
30             ActionContext.getContext().getSession().put("um", listum.get(0));//  一次請求對象存入做用域
31             //處理Cookie： name：userInfo 
32             Cookie c=new Cookie("userid", um.getUserid()+"");  
33             HttpServletRequest request = ServletActionContext.getRequest();
34             HttpServletResponse response = ServletActionContext.getResponse();
35             c.setPath(request.getContextPath());  
36             if(remenber==0){  
37                 //Cookie 時間
38                 c.setMaxAge(0);  
39             }else{  
40                 //記住Cookie  
41                 c.setMaxAge(60*60);//保存時間 一分鐘           
42             } 
43             response.addCookie(c);//將Cookie相應到客戶端 
44             
45             
46         }else {
47             return "loginhtml";
48         }
49 
50         return "login";
51     }
52     public UserModel getUm() {
53         return um;
54     }
55     public void setUm(UserModel um) {
56         this.um = um;
57     }
58     public int getRemenber() {
59         return remenber;
60     }
61     public void setRemenber(int remenber) {
62         this.remenber = remenber;
63     }
64     
65     
66 }