学用MVC4做网站一:用户登陆1.2

一用户

1.1用户注册

1.2用户登陆

首先在Models里添加用户登陆模型类UserLogin，该类只要用用户名，密码和验证码三个字段。

/// <summary>
    /// 用户登陆模型
    /// </summary>
    public class UserLogin
    {
        /// <summary>
        /// 用户名
        /// </summary>
        [Display(Name = "用户名", Description = "4-20个字符。")]
        [Required(ErrorMessage = "×")]
        [StringLength(20, MinimumLength = 4, ErrorMessage = "×")]
        public string UserName { get; set; }
        /// <summary>
        /// 密码
        /// </summary>
        [Display(Name = "密码", Description = "6-20个字符。")]
        [Required(ErrorMessage = "×")]
        [StringLength(20, MinimumLength = 6, ErrorMessage = "×")]
        [DataType(DataType.Password)]
        public string Password { get; set; }
        /// <summary>
        /// 验证码
        /// </summary>
        [Display(Name = "验证码", Description = "请输入图片中的验证码。")]
        [Required(ErrorMessage = "×")]
        [StringLength(6, MinimumLength = 6, ErrorMessage = "×")]
        public string VerificationCode { get; set; }

    }

在UserController里添加Login action； 代码看如下：

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

使用Cookie保存登陆账号，密码等信息，修改public ActionResult Login(UserLogin login)。修改完成代码如下：

[HttpPost]
        public ActionResult Login(UserLogin login)
        {
            //验证验证码
            if (Session["VerificationCode"] == null || Session["VerificationCode"].ToString() == "")
            {
                Error _e = new Error { Title = "验证码不存在", Details = "在用户注册时，服务器端的验证码为空，或向服务器提交的验证码为空", Cause = "<li>你注册时在注册页面停留的时间过久页已经超时</li><li>您绕开客户端验证向服务器提交数据</li>", Solution = "返回<a href='" + Url.Action("Register", "User") + "'>注册</a>页面，刷新后重新注册" };
                return RedirectToAction("Error", "Prompt", _e);
            }
            else if (Session["VerificationCode"].ToString() != login.VerificationCode.ToUpper())
            {
                ModelState.AddModelError("VerificationCode", "×");
                return View();
            }
            //验证账号密码
            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", "登陆失败！");
                return View();
            }

        }

在public ActionResult Login() 上右键添加强类型视图

完成后代的Login.cshtml

@model CMS.Models.UserLogin

@{
    ViewBag.Title = "用户登陆";
    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>用户登陆</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">验证码：</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">换一张</a>
                </div>
            </dd>
            <dd>
                <div class="label"></div>
                <div class="ctrl">
                    <input type="submit" value="登陆" />@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")
}

浏览器中查看一下登陆页面

点下登陆测试一下。OK登陆成功

验证用户是否已经登陆，这块和权限验证一起从AuthorizeAttribute继承个自定义验证类

在项目里添加Extensions文件夹，添加一个类UserAuthorizeAttribute 继承自AuthorizeAttribute，重写AuthorizeCore方法用来实现用户是否已经登陆的验证，权限验证在写权限功能时在补充

using Ninesky.Repository;

namespace System.Web.Mvc
{
    /// <summary>
    /// 用户权限验证
    /// </summary>
    public class UserAuthorizeAttribute :AuthorizeAttribute
    {
        /// <summary>
        /// 核心【验证用户是否登陆】
        /// </summary>
        /// <param name="httpContext"></param>
        /// <returns></returns>
        protected override bool AuthorizeCore(HttpContextBase httpContext)
        {
            //检查Cookies["User"]是否存在
            if (httpContext.Request.Cookies["User"] == null) return false;
            //验证用户名密码是否正确
            HttpCookie _cookie = httpContext.Request.Cookies["User"];
            string _userName = _cookie["UserName"];
            string _password = _cookie["Password"];
            httpContext.Response.Write("用户名:"+_userName);
            if (_userName == "" || _password == "") return false;
            UserRepository _userRsy = new UserRepository();
            if (_userRsy.Authentication(_userName, _password) == 0) return true;
            else return false;
        }
    }
}

以后只要在需要登陆后才能操作的Action或Controller上加[UserAuthorize]就可实现验证是否已经登录了。

退出功能，在UserController添加Logout Action

/// <summary>
        /// 退出系统
        /// </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 = "您已经成功退出！", DwellTime = 5, NavigationName="网站首页", NavigationUrl = Url.Action("Index", "Home") };
            return RedirectToAction("Notice", "Prompt", _n);
        }