MVC4制作網站教程第二章 用戶登陸2.2

一用戶 
1.1用戶注冊 
1.2用戶登陸 

首先在Models裡添加用戶登陸模型類UserLogin，該類只要用用戶名，密碼和驗證碼三個字段。 

/// <summary>
 /// 用戶登陸模型
 /// </summary>
 public class UserLogin
 {
 /// <summary>
 /// 用戶名
 /// </summary>
 [Display(Name = "用戶名", Description = "4-20個字符。")]
 [Required(ErrorMessage = "×")]
 [StringLength(20, MinimumLength = 4, ErrorMessage = "×")]
 public string UserName { get; set; }
 /// <summary>
 /// 密碼
 /// </summary>
 [Display(Name = "密碼", Description = "6-20個字符。")]
 [Required(ErrorMessage = "×")]
 [StringLength(20, MinimumLength = 6, ErrorMessage = "×")]
 [DataType(DataType.Password)]
 public string Password { get; set; }
 /// <summary>
 /// 驗證碼
 /// </summary>
 [Display(Name = "驗證碼", Description = "請輸入圖片中的驗證碼。")]
 [Required(ErrorMessage = "×")]
 [StringLength(6, MinimumLength = 6, ErrorMessage = "×")]
 public string VerificationCode { get; set; }

 }

在UserController裡添加Login action； 代碼看如下：

public ActionResult Login()
 {
  return View();
 }
 [HttpPost]
 public ActionResult Login(UserLogin login)
 {
  return View();
 }

使用Cookie保存登陸賬號，密碼等信息，修改public ActionResult Login(UserLogin login)。修改完成代碼如下：

[HttpPost]
 public ActionResult Login(UserLogin login)
 {
  //驗證驗證碼
  if (Session["VerificationCode"] == null || Session["VerificationCode"].ToString() == "")
  {
  Error _e = new Error { Title = "驗證碼不存在", Details = "在用戶注冊時，服務器端的驗證碼為空，或向服務器提交的驗證碼為空", Cause = "<li>你注冊時在注冊頁面停留的時間過久頁已經超時</li><li>您繞開客戶端驗證向服務器提交數據</li>", Solution = "返回<a href='" + Url.Action("Register", "User") + "'>注冊</a>頁面，刷新後重新注冊" };
  return RedirectToAction("Error", "Prompt", _e);
  }
  else if (Session["VerificationCode"].ToString() != login.VerificationCode.ToUpper())
  {
  ModelState.AddModelError("VerificationCode", "×");
  return View();
  }
  //驗證賬號密碼
  userRsy = new UserRepository();
  if (userRsy.Authentication(login.UserName, Common.Text.Sha256(login.Password)) == 0)
  {
  HttpCookie _cookie = new HttpCookie("User");
  _cookie.Values.Add("UserName", login.UserName);
  _cookie.Values.Add("Password", Common.Text.Sha256(login.Password));
  Response.Cookies.Add(_cookie);
  return RedirectToAction("Default","User");
  }
  else
  {
  ModelState.AddModelError("Message", "登陸失敗！");
  return View();
  }

 }

在public ActionResult Login() 上右鍵添加強類型視圖

完成後代的Login.cshtml 

@model CMS.Models.UserLogin

@{
 ViewBag.Title = "用戶登陸";
 Layout = "~/Views/Shared/_Layout.cshtml";
}
 
<div class="banner"> 
 <img src="~/Skins/Default/Images/banner.jpg" /> 
</div>
 

@using (Html.BeginForm()) 
{ 
 @Html.ValidationSummary(true)

 <div class="form"> 
 <dl> 
  <dt>用戶登陸</dt> 
  <dd> 
  <div class="label">@Html.LabelFor(model => model.UserName)：</div> 
  <div class="ctrl">@Html.EditorFor(model => model.UserName) 
   @Html.ValidationMessageFor(model => model.UserName) 
   @Html.DisplayDescriptionFor(model => model.UserName) 
  </div> 
  </dd> 
  <dd> 
  <div class="label">@Html.LabelFor(model => model.Password)：</div> 
  <div class="ctrl">@Html.PasswordFor(model => model.Password) 
   @Html.ValidationMessageFor(model => model.Password) 
   @Html.DisplayDescriptionFor(model => model.Password) 
  </div> 
  </dd> 
  <dd> 
  <div class="label">驗證碼：</div> 
  <div class="ctrl">
   @Html.TextBoxFor(model => model.VerificationCode) 
   @Html.ValidationMessageFor(model => model.VerificationCode) 
   <img id="verificationcode" alt="" src="@Url.Action("VerificationCode", "User")" /> 
   <a id="trydifferent" style="cursor: pointer">換一張</a> 
  </div> 
  </dd> 
  <dd> 
  <div class="label"></div> 
  <div class="ctrl"> 
   <input type="submit" value="登陸" />@Html.ValidationMessage("Message"); 
  </div> 
  </dd> 
 </dl> 
 <div class="clear"></div> 
 </div>
}

<script type="text/javascript">
 $("#trydifferent").click(function () { 
 $("#verificationcode").attr("src", "/User/VerificationCode?" + new Date()); 
 })

</script>
@section Scripts { 
 @Scripts.Render("~/bundles/jqueryval") 
}

浏覽器中查看一下登陸頁面

點下登陸測試一下。OK登陸成功 

驗證用戶是否已經登陸，這塊和權限驗證一起從AuthorizeAttribute繼承個自定義驗證類 

在項目裡添加Extensions文件夾，添加一個類UserAuthorizeAttribute 繼承自AuthorizeAttribute，重寫AuthorizeCore方法用來實現用戶是否已經登陸的驗證，權限驗證在寫權限功能時在補充 

using Ninesky.Repository;

namespace System.Web.Mvc
{
 /// <summary>
 /// 用戶權限驗證
 /// </summary>
 public class UserAuthorizeAttribute :AuthorizeAttribute
 {
 /// <summary>
 /// 核心【驗證用戶是否登陸】
 /// </summary>
 /// <param name="httpContext"></param>
 /// <returns></returns>
 protected override bool AuthorizeCore(HttpContextBase httpContext)
 {
  //檢查Cookies["User"]是否存在
  if (httpContext.Request.Cookies["User"] == null) return false;
  //驗證用戶名密碼是否正確
  HttpCookie _cookie = httpContext.Request.Cookies["User"];
  string _userName = _cookie["UserName"];
  string _password = _cookie["Password"];
  httpContext.Response.Write("用戶名:"+_userName);
  if (_userName == "" || _password == "") return false;
  UserRepository _userRsy = new UserRepository();
  if (_userRsy.Authentication(_userName, _password) == 0) return true;
  else return false;
 }
 }
}

以後只要在需要登陸後才能操作的Action或Controller上加[UserAuthorize]就可實現驗證是否已經登錄了。
退出功能，在UserController添加Logout Action 

/// <summary>
 /// 退出系統
 /// </summary>
 /// <returns></returns>
 public ActionResult Logout()
 {
  if (Request.Cookies["User"] != null)
  {
  HttpCookie _cookie = Request.Cookies["User"];
  _cookie.Expires = DateTime.Now.AddHours(-1);
  Response.Cookies.Add(_cookie);
  }
  Notice _n = new Notice { Title = "成功退出", Details = "您已經成功退出！", DwellTime = 5, NavigationName="網站首頁", NavigationUrl = Url.Action("Index", "Home") };
  return RedirectToAction("Notice", "Prompt", _n);
 }

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。