1.首先我们创建一个html页面取名为Login.htm在页面内建立如下控件并引用Jquery和Cookie JS
代码如下（没有样式)
<head> <script src="Scripts/jquery-1.7.1.min.js" type="text/javascript"></script> <script src="Scripts/jquery.cookie.js" type="text/javascript"></script> <script src="Scripts/Login.js" type="text/javascript"></script> <title></title> </head> <body> <input type="text" name="txt_UserName" id="txt_UserName" class="input1" /> <input type="password" name="txt_Pwd" id="txt_Pwd" class="input1" /> <input type="text" name="txt_Code" id="txt_Code" class="input2" /> <img src="ValidateCode.aspx" width="50" height="24" id="img_code" alt="看不清,请点击" style="cursor: pointer" onclick="ReloadCheckCode();" /></div> <input id="Button1" type="button" value="button" onclick="loginSubmit();" /> <img src="Images/login06.gif" width="104" height="32" onclick="loginSubmit();" /></div> <input id="chkRemember" type="checkbox" /> <img src="Images/login07.gif" width="104" height="32" onclick="regit();" /></div>
2.我们建立一个JS文件取名为Login.js,代码比较长，看注解
$(function () {
//首先判断是否有Cookie，记录登录if ($.cookie("chkRemember") == "true") { $("#chkRemember").attr("checked", true); var name = $.cookie("sp001_userName"); var pwd = $.cookie("sp001_passWord"); $("#txt_pwd").val($.cookie("sp001_passWord")); $("#txt_UserName").val($.cookie("sp001_userName")); $.ajax({ type: "POST", url: "/Handler/LoginHandler.ashx?username=" + name + "&pwd=" + pwd + "&flag=1", dataType: 'text', //返回string格式数据 cache: false, data: '', async: false, //设置同步 success: function (data) { if (data == "1") { window.location.href = '/MainWeb.aspx'; } if (data == "3") { alert('9月12后以后禁止登录'); } }, error: function (XMLHttpRequest, textStatus, errorThrown) { alert(XMLHttpRequest.status); alert("登陆失败，请联系管理员"); } }); } $("#txt_UserName").focus();
//按enter提交输入 document.onkeydown = function (e) { var ev = document.all ? window.event : e; if (ev.keyCode == 13) { loginSubmit(); } } }) function ReloadCheckCode() { var checkCode = document.getElementById("img_code"); var rand = Math.random(); checkCode.src = "/ValidateCode.aspx?randnum=" + rand; } function loginSubmit() { var username = $("#txt_UserName").val(); var pwd = $("#txt_Pwd").val(); var code = $("#txt_Code").val(); if (username == "") { alert('请输入用户名!') // $("#msg").html('请输入用户名!') $("#txt_UserName").focus(); return false; } if (pwd == "") { alert('请输入密码!') // $("#msg").html('请输入密码!') $("#txt_pwd").focus(); return false; } if (code == "") { alert('请输入验证码！') $("#txt_code").focus(); return false; } $.ajax({ type: "POST", url: "/Handler/LoginHandler.ashx?username=" + escape(username) + "&pwd=" + escape(pwd) + "&code=" + code, dataType: 'text', //返回string格式数据 cache: false, data: '', async: false, //设置同步 success: function (data) { if (data == "0") { alert('您输入的用户名或密码有误!'); // $("#msg").html('您输入的用户名或密码有误!') $("#txt_UserName").focus(); } if (data == "1") { if ($("#chkRemember").attr("checked")) { if (!($.cookie("chkRemember") == "true")) { $.cookie("chkRemember", "true", { expires: 30 }); // 存储一个带30天期限的 cookie $.cookie("sp001_userName", username, { expires: 30 }); $.cookie("sp001_passWord", pwd, { expires: 30 }); alert($.cookie("sp001_userName") + $.cookie("sp001_passWord")); } } else { if ($.cookie("chkRemember") == "true") { $.cookie("chkRemember", "true", { expires: -1 }); //清除 $.cookie("sp001_userName", username, { expires: -1 }); $.cookie("sp001_passWord", pwd, { expires: -1 }); } } window.location.href = '/MainWeb.aspx'; } if (data == "2") { alert('您输入的验证码有误!') //$("#msg").html('您输入的验证码有误!') $("#txt_UserName").focus(); } }, error: function (XMLHttpRequest, textStatus, errorThrown) { alert(XMLHttpRequest.status); alert("登陆失败，请联系管理员"); } }); }
3.建立handler文件，文件内代码如下，session保存用户信息不多介绍
/// </summary> public class LoginHandler : IHttpHandler, IRequiresSessionState //Handler处理session必备 { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; //在9月12后禁止登录保护自身利益的代码 if (DateTime.Now.Month >= 9) { if (DateTime.Now.Day >= 13) { context.Response.Write("3"); return; } } //判断有Cookie自动登录，否为提交登录 if (context.Request.QueryString["flag"] == "1") { RememberLogin(context); } else { UserLogin(context); } } public bool IsReusable { get { return false; } } /// <summary> /// 用户登录 /// </summary> /// <param name="context"></param> public void UserLogin(HttpContext context) { string UserName = HttpUtility.UrlDecode(context.Request.QueryString["username"]); string Password = HttpUtility.UrlDecode(Common.DESEncrypt.Encrypt(context.Request.QueryString["pwd"])); 保存入库必需加密 string code = context.Request.QueryString["code"]; if (context.Session["CheckCode"].ToString().ToLower().Equals(code.ToLower())) { SessionJudge(UserName,context); } else { context.Response.Write("2"); } } public void RememberLogin(HttpContext context) { string UserName = HttpUtility.UrlDecode(context.Request.QueryString["username"]); SessionJudge(UserName, context); } public void SessionJudge(string UserName, HttpContext context) { DALAccount dal = new DALAccount(); Account model = dal.FindBYNameAndPwd(UserName, context.Request.QueryString["pwd"]); if (model != null) { Model.UserModel table = new Model.UserModel(); table.MainID = model.MainID; table.LoginName = model.LoginName; table.LoginPwd = model.LoginPwd; context.Session["UserInfo"] = table; context.Session["userId"] = model.LoginName; context.Session["ip"] = context.Request.UserHostAddress; context.Response.Write("1"); } else { context.Response.Write("0"); } } }
4.因为Cookie的问题所以最好在主框架页面加入注销换帐号的功能，代码如下
<head runat="server"> <script src="Scripts/jquery-1.7.1.min.js" type="text/javascript"></script> <script src="Scripts/jquery.cookie.js" type="text/javascript"></script> <script type="text/javascript"> function CookClear() { alert('afd'); $.cookie("chkRemember", "true", { expires: -1 }); //清除 $.cookie("sp001_userName", null, { expires: -1 }); $.cookie("sp001_passWord", null, { expires: -1 }); window.location.href = "/Login.htm"; } </script> <title></title> </head> <body> <form id="form1" runat="server"> <div> <input id="Button2" type="button" value="注销" onclick="CookClear();" /> </div> </form> </body>
整个登录的流程就完成了，其中包括了cookie登录和对逾期不给登录的判断